Power supply lc b300atx circuit. Schematic diagrams of computer equipment
Utilities and reference books.
- Directory in .chm format. The author of this file is Kucheryavenko Pavel Andreevich. Most of the original documents were taken from the site pinouts.ru - brief descriptions and pinouts of more than 1000 connectors, cables, adapters. Descriptions of buses, slots, interfaces. Not only computer equipment, but also cell phones, GPS receivers, audio, photo and video equipment, game consoles and other equipment.The program is designed to determine the capacitance of the capacitor by color marking (12 types of capacitors).
Transistor database in Access format.
Power supplies.
Table of pins for the 24-pin ATX power supply connector (ATX12V) with ratings and color coding of wires
| Comte | Symbol | Color | Description | |
|---|---|---|---|---|
| 1 | 3.3V | Orange | +3.3 VDC | |
| 2 | 3.3V | Orange | +3.3 VDC | |
| 3 | COM | Black | Earth | |
| 4 | 5V | Red | +5 VDC | |
| 5 | COM | Black | Earth | |
| 6 | 5V | Red | +5 VDC | |
| 7 | COM | Black | Earth | |
| 8 | PWR_OK | Grey | Power Ok - All voltages are within normal limits. This signal is generated when the PSU is turned on and is used to reset the system board. | |
| 9 | 5VSB | Violet | +5 VDC Standby voltage | |
| 10 | 12V | Yellow | +12 VDC | |
| 11 | 12V | Yellow | +12 VDC | |
| 12 | 3.3V | Orange | +3.3 VDC | |
| 13 | 3.3V | Orange | +3.3 VDC | |
| 14 | -12V | Blue | -12 VDC | |
| 15 | COM | Black | Earth | |
| 16 | /PS_ON | Green | Power Supply On. To turn on the power supply, you need to short this contact to ground (with a black wire). | |
| 17 | COM | Black | Earth | |
| 18 | COM | Black | Earth | |
| 19 | COM | Black | Earth | |
| 20 | -5V | White | -5 VDC (This voltage is used very rarely, mainly for powering old expansion cards.) | |
| 21 | +5V | Red | +5 VDC | |
| 22 | +5V | Red | +5 VDC | |
| 23 | +5V | Red | +5 VDC | |
| 24 | COM | Black | Earth |
ATX-300P4-PFC power supply circuit (ATX-310T 2.03).
Schematic diagram of the ATX-P6 power supply.
Diagram of the API4PC01-000 400w power supply manufactured by Acbel Politech Ink.
Alim ATX 250Watt SMEV J.M. 2002.
A typical 300W power supply circuit with notes on the functional purpose of individual parts of the circuit.
A typical 450W power supply circuit with the implementation of active power factor correction (PFC) of modern computers.
Schematic diagram of API3PCD2-Y01 450w power supply manufactured by ACBEL ELECTRONIC (DONGGUAN) CO. Ltd.
ATX 250 SG6105, IW-P300A2 power supply schematics, and 2 circuits of unknown origin.
PSU diagram NUITEK (COLORS iT) 330U (sg6105).
PSU diagram NUITEK (COLORS iT) 330U on the SG6105 chip.
PSU diagram NUITEK (COLORS iT) 350U SCH.
PSU diagram NUITEK (COLORS iT) 350T.
PSU diagram NUITEK (COLORS iT) 400U.
PSU diagram NUITEK (COLORS iT) 500T.
Schematic PSU NUITEK (COLORS iT) ATX12V-13 600T (COLORS-IT - 600T - PSU, 720W, SILENT, ATX)
Schematic PSU CHIEFTEC TECHNOLOGY GPA500S 500W Model GPAxY-ZZ SERIES.
Schematic PSU Codegen 250w mod. 200XA1 mod. 250XA1.
Schematic PSU Codegen 300w mod. 300X.
PSU diagram CWT Model PUH400W.
PSU Diagram Delta Electronics Inc. model DPS-200-59 H REV:00.
PSU Diagram Delta Electronics Inc. model DPS-260-2A.
PSU diagram DTK Computer model PTP-2007 (aka MACRON Power Co. model ATX 9912)
PSU diagram DTK PTP-2038 200W.
PSU diagram EC model 200X.
PSU diagram FSP Group Inc. model FSP145-60SP.
Scheme of the standby power supply of the FSP Group Inc. model ATX-300GTF.
Scheme of the standby power supply of the FSP Group Inc. model FSP Epsilon FX 600 GLN.
Schematic diagram of the Green Tech PSU. model MAV-300W-P4.
HIPER HPU-4K580 power supply schematics. In the archive - a file in SPL format (for the sPlan program) and 3 files in GIF format - simplified circuit diagrams: Power Factor Corrector, PWM and power circuit, oscillator. If you have nothing to view .spl files, use diagrams in the form of pictures in .gif format - they are the same.
INWIN IW-P300A2-0 R1.2 power supply circuits.
INWIN IW-P300A3-1 Powerman power supply circuits.
The most common malfunction of the Inwin power supplies, the circuits of which are given above, is the failure of the + 5VSB (duty) voltage generation circuit. As a rule, the electrolytic capacitor C34 10uF x 50V and the protective zener diode D14 (6-6.3 V) need to be replaced. In the worst case, R54, R9, R37, U3 chip (SG6105 or IW1688 (full analogue of SG6105)) are added to the faulty elements.
Powerman IP-P550DJ2-0 power supply circuit (IP-DJ Rev: 1.51 board). The standby voltage generation scheme available in the document is used in many other models of Power Man power supplies (for many 350W and 550W power supplies, the differences are only in the ratings of the elements).
JNC Computer Co. LTD LC-B250ATX
JNC Computer Co. Ltd. SY-300ATX Power Supply Diagram
Presumably manufacturer JNC Computer Co. Ltd. Power supply SY-300ATX. The scheme is drawn by hand, comments and recommendations for improvement.
Power Supply Schematics Key Mouse Electroniks Co Ltd model PM-230W
Power Supply Circuits L&C Technology Co. model LC-A250ATX
LWT2005 power supply circuits on the KA7500B and LM339N chip
PSU diagram M-tech KOB AP4450XA.
PSU diagram MACRON Power Co. ATX 9912 model (aka DTK Computer model PTP-2007)
Schematic PSU Maxpower PX-300W
Schematic PSU Maxpower PC ATX SMPS PX-230W ver.2.03
PowerLink power supply circuits model LP-J2-18 300W.
Power Master power supply circuits model LP-8 ver 2.03 230W (AP-5-E v1.1).
Power Master power supply circuits model FA-5-2 ver 3.2 250W.
Schematic PSU Microlab 350W
Schematic PSU Microlab 400W
Schematic PSU Powerlink LPJ2-18 300W
Schematic PSU Power Efficiency Electronic Co LTD model PE-050187
Schematic PSU Rolsen ATX-230
PSU diagram SevenTeam ST-200HRK
Schematic PSU SevenTeam ST-230WHF 230Watt
Schematic PSU SevenTeam ATX2 V2
The continuation of familiarization with power supplies took place on the Hiper lineup (manufactured by the Taiwanese High Performance Group) and L&C (manufactured by the Taiwanese L&C Technology group). For review, I was offered
- HPU-4K480
- HPU-4R480
- HPU-4S480-EU
- HPU-3S350
- HPU-4S525
- HPU-4S425
from the first company
- LC-B300-ATX
- LC-B350-ATX
from the second.
Looking ahead, it is worth noting that, despite the apparent similarity of the models, which suggests itself, based on the names of the Hiper blocks, in fact, the power supplies are completely different - and this applies not only to the “external” design, but also to the results of work. Let's start with the fact that the HPU-4K480, HPU-4R480 and HPU-4S480-EU units are an "export version", which stands out from the rest of the listed series by a significant number of options offered.
Appearance, delivery set
The body of the model with the R index is red, the surface is matte; the body of the model with the K index is made of black metal, the surface is almost mirror-like; following the proposed logic, the manufacturer made a model with the S index in a silver case. All of these power supplies are equipped with a 120mm fan, and the HPU-4R480 has a red backlit fan. Since the appearance of the blocks is identical (with the exception of the reservations made), we will only give a photo of the stickers indicating the capacities of each block and the “general view” of one of them.
As for the connectors, in this case the differences are minimal, and affect only the main one:
The HPU-4R480 package includes two cords for connecting the unit to the network (moreover, one of them is a three-pin one) and a user manual. A small wealth of options, apparently, is offset by the appearance of the solution. The HPU-4K480 is already very diverse: in addition to the listed components, it comes with an 80 mm additional fan (for installation in a system unit), as well as an adapter for the main power connector, 20-24 pin. The HPU-4S480-EU comes with just one power cord (Euro plug), an additional 80mm fan, a manual, and two stylish round IDE cables. All this is packed in each case in such a “box” (of course, the color design of the sticker, and the text on it correspond to each specific block model):
HPU-4K480
Ripple on the +12 V bus is about 12.8 mV, on +5 V - no more than 16 mV.
The stability of the output voltages was checked as follows: each of the buses was loaded from the minimum shown in the table to the maximum with a current change step of 1A / µs, the loading of all buses occurred simultaneously, that is, the situation was simulated with a minimum, typical and full load (in terms of PSDG). The load was driven in a cycle for two hours, measurements were taken 5 times, the data below is the average result of five measurements. The results of the voltage stability test: the minimum value on the +12 V bus, recorded during the measurements, was +11.78 V, and the maximum value was +12.25 V, on the +5 V bus, the minimum value was +4.76, the maximum value was 5 .21 V, +3.3 V bus - +3.11 and 3.48 V, respectively. Recall that according to PSDG, +12/+5/+3.3V output voltage deviations can be ±5% (+11.40~+12.60V, +4.75~+5.25V and + 3.14 ~ 3.47 V), but with two reservations: firstly, at a peak load of the +12 V bus, deviations can be up to 10%, secondly, the ATX specification tightens the requirement for permissible voltage deviation limits of 3, 3 V: ±4% instead of the ±5 mentioned in the Power Supply Design Guide). On the +3.3 V bus, the block clearly “failed”, however, given the not so great importance of this voltage, as well as measurement errors, it is not worth taking seriously going beyond the limits by such insignificant values.
HPU-4R480
Ripple on the +12 V bus is about 25.6 mV, on +5 V - no more than 16.8 mV.
The results of the voltage stability check: the minimum value on the +12 V bus, recorded during the measurements, was +11.40, and the maximum value was +12.42 V, on the +5 V bus, the minimum value was +4.89, the maximum value was +5 .40 V, +3.3 V bus - +3.22 and +3.40 V, respectively. The unit was within the limits of permissible voltage fluctuations, although the minimum value on the +12 V bus is equal to the threshold.
HPU-4S480-EU
Ripple on the +12 V bus is about 12.0 mV, on +5 V - no more than 21.6 mV.
The results of the voltage stability test: the minimum value on the +12 V bus, recorded during the measurements, was +11.77 V, and the maximum - +12.29 V, on the +5 V bus, the minimum value was +4.75, the maximum - + 5.29 V, +3.3 V bus - +3.14 and +3.41 V, respectively. It is worth noting that the +5 V bus is clearly “limping” at the block - the maximum minimum and the maximum value that goes beyond.
The remaining three models are "retail" delivery, which does not have expensive packaging and is offered to consumers in cardboard boxes sealed in polypropylene (stylish, it should be noted). Unlike the three previous models, these solutions cannot boast of either a bewitching appearance or an abundance of options - they are made of standard metal. With the exception of the HPU-3S350, in this trio of units all have two 80mm fans (one on the bottom cover, the second on the rear panel), the mentioned model has only one 80mm fan - on the rear panel.
HPU-4S525
HPU-4S425
HPU-3S350
This trio differs from the three "export" blocs in O more "inconsistency" in the number of contacts:
1 - formula 20 + 4 means that 4 pins at the connector are "unfastened"
HPU-3S350
Ripple on the +12 V bus is about 10.4 mV, on +5 V - no more than 16.8 mV.
The results of the voltage stability test: the minimum value on the +12 V bus, recorded during the measurements, was +11.77 V, the maximum - +12.42 V, on the +5 V bus, the minimum value - +4.83, the maximum - +5 .29 V, +3.3 V bus - +3.11 and +3.31 V, respectively. The block went beyond the limits on the +5 and +3.3 V buses, however, the deviations are extremely minor.
HPU-4S525
Ripple on the +12 V bus is about 31.2 mV, on +5 V - no more than 35.2 mV.
The results of the voltage stability test: the minimum value on the +12 V bus, recorded during the measurements, was +11.78, and the maximum value was +12.42 V, on the +5 V bus, the minimum value was +4.93, the maximum value was +5 .24 V, +3.3 V bus - +3.15 and +3.57 V, respectively. The only voltage that can be criticized in this case is +3.3V - the overshoot was exactly 0.1 V.
HPU-4S425
Ripple on the +12 V bus is about 24.0 mV, on +5 V - no more than 22.4 mV.
The results of the voltage stability test: the minimum value on the +12 V bus, recorded during the measurements, was +11.57, and the maximum - 12.63 V, on the +5 V bus, the minimum value was +4.77, the maximum - 5.17 V, on the +3.3 V bus - +3.15 and +3.45 V, respectively. The voltage of +12 V, which has slightly exceeded the upper limit, can hardly be considered a serious claim to the block.
The appearance of LC power supplies is quite ordinary and common for inexpensive solutions: standard gray metal. All three blocks do not have any additional options in the delivery set, their bodies are made of ordinary tin. Except for the LC-B350ATX, the holes of the units' exhaust fans are not covered with screw-on decorative grilles, but are simply cut into the metal (in the first case, everything is just the opposite). Of these three units, only the LC-B350ATX has two fans (80mm), the other two have exhaust fans only.
Being middle-end solutions in appearance, these power supplies are equipped with “old” connector kits:
LC-B300-ATX
Ripple on the +12 V bus is about 24.0 mV, on +5 V - no more than 17.6 mV.
The results of the voltage stability test: the minimum value on the +12 V bus, recorded during the measurements, was +11.27, and the maximum value was 12.28 V, on the +5 V bus, the minimum value was +4.68, the maximum value was +5, 16 V, +3.3 V bus - +3.01 and +3.35 V, respectively. Alas, the block showed frankly poor results - the +12 V and +3.3 V buses sag heavily, which casts doubt on the possibility of using the block in "critical" systems
LC-B350-ATX
Ripple on the +12 V bus is about 28.0 mV, on +5 V - no more than 4.8 mV.
The results of the voltage stability test: the minimum value on the +12 V bus, recorded during the measurements, was +11.42, and the maximum value was 11.89 V, on the +5 V bus, the minimum value was +4.64, the maximum value was +5, 04 V, +3.3 V bus - +3.09 and +3.35 V, respectively. Weakness of all three buses is observed - at +12 V the unit did not give out a nominal value even in its best times, +5 V creeps down a lot, like the +3.3 V bus. Indiscriminate conclusions that all L&C units leave much to be desired it’s too early - after all, three blocks is not an indicator, but it’s probably worth it to be wary of these models.
conclusions
Taking into account the measurement errors, we can assume that the HPU series units - in all their variants - both retail and export - look quite decent and can be used in systems of various levels (taking into account power). As for the L&C blocks, in my opinion, the issue requires additional study, because the three blocks considered did not inspire optimism and made us think about the advisability of using them without a thorough study and assessment of the conditions for unconditional operation.
To be continued...
The basis of modern business is making big profits with relatively low investments. Although this path is disastrous for our own domestic developments and industry, business is business. Here, either introduce measures to prevent the penetration of cheap zaptsatsak, or make money on it. For example, if you need a cheap power supply, then you don’t need to invent and design, killing money - you just need to look at the market for common Chinese junk and try to build what you need based on it. The market, more than ever, is littered with old and new computer power supplies of various capacities. This power supply has everything you need - various voltages (+12 V, +5 V, +3.3 V, -12 V, -5 V), protection of these voltages from overvoltage and overcurrent. At the same time, computer power supplies such as ATX or TX are lightweight and small in size. Of course, the power supplies are pulsed, but there is practically no high-frequency interference. In this case, you can go in the standard proven way and install a conventional transformer with several taps and a bunch of diode bridges, and carry out regulation with a high-power variable resistor. From the point of view of reliability, transformer units are much more reliable than pulse ones, because in a pulse power supply there are several tens of times more parts than in a transformer power supply of the USSR type, and if each element is slightly less than one in reliability, then the overall reliability is the product of all elements and as a result - switching power supplies are much less reliable than transformer power supplies by several tens of times. It seems that if so, then there is nothing to fence the garden and switching power supplies should be abandoned. But here a more important factor than reliability, in our reality is the flexibility of production, and impulse blocks can be quite easily transformed and rebuilt for absolutely any technique, depending on production requirements. The second factor is the trade in zapatska. With a sufficient level of competition, the manufacturer seeks to sell the product at cost, while accurately calculating the warranty time so that the equipment breaks down the next week, after the end of the warranty, and the client would buy spare parts at inflated prices. Sometimes it comes to the point that it is easier to buy new equipment than to repair its used equipment from the manufacturer.
It is quite normal for us to screw in a trance instead of a burned-out power supply or prop up the red gas start button in Defect ovens with a tablespoon, and not buy a new part. Our mentality is clearly cut through by the Chinese and they strive to make their products unrepairable, but we, like in a war, manage to repair and improve their unreliable equipment, and if everything is already a “pipe”, then at least remove some thread and throw it into other equipment.
I needed a power supply to test electronic components with adjustable voltage up to 30 V. There was a transformer, but it’s not serious to regulate through a cutter, and the voltage will float at different currents, but there was an old ATX power supply from a computer. The idea was born to adapt the computer unit to a regulated power supply. Googling the topic, I found several alterations, but all of them suggested radically throwing out all protection and filters, and we would like to save the entire block in case we have to use it for its intended purpose. So I started experimenting. The goal is to create an adjustable power supply with voltage limits from 0 to 30 V without cutting out the filling.
Part 1. So-so.
The block for experiments was quite old, weak, but stuffed with many filters. The unit was covered in dust, so I opened it up and cleaned it before starting it. The appearance of the details did not arouse suspicion. Once everything suits - you can do a test run and measure all the voltages.
12 V - yellow
5 V - red
3.3 V - orange
5 V - white
12 V - blue
0 - black
There is a fuse at the input of the block, and the block type LC16161D is printed next to it.
The ATX type block has a connector for connecting it to the motherboard. Simply plugging the unit into a socket does not turn on the unit itself. The motherboard closes two pins on the connector. If they are closed, the unit will turn on and the fan - the on indicator - will start rotating. The color of the wires that need to be shorted to turn on is indicated on the cover of the unit, but usually they are "black" and "green". You need to insert a jumper and plug the unit into an outlet. If you remove the jumper, the unit will turn off.
The TX block is turned on by a button located on the cable coming out of the power supply.
It is clear that the block is working and before starting the alteration, you need to unsolder the fuse located at the entrance and solder the cartridge with an incandescent bulb instead. The more powerful the lamp, the less voltage will drop across it during tests. The lamp will protect the power supply from all overloads and breakdowns and will not allow the elements to burn out. At the same time, pulse blocks are practically insensitive to voltage drops in the supply network, i.e. Although the lamp will shine and eat kilowatts, there will be no drawdown from the lamp in terms of output voltages. I have a lamp for 220 V, 300 watts.
The blocks are built on the TL494 control chip or its analogue KA7500. Also often used mikruhe comporator LM339. All harness comes here and it is here that you will have to make major changes.
The voltage is normal, the unit is working. We proceed to the improvement of the voltage regulation unit. The block is pulsed and regulation occurs due to the regulation of the duration of the opening of the input transistors. By the way, I always thought that field-effect transistors oscillate the entire load, but, in fact, fast switching bipolar transistors of the 13007 type are also used, which are also installed in energy-saving lamps. In the power supply circuit, you need to find a resistor between 1 leg of the TL494 chip and the +12 V power bus. In this circuit, it is denoted by R34 = 39.2 kOhm. A resistor R33 = 9 kΩ is installed nearby, which connects the +5 V bus and 1 leg of the TL494 chip. Replacing the resistor R33 does nothing. It is necessary to replace the resistor R34 with a variable resistor of 40 kOhm, and more is possible, but it turned out to raise the voltage along the +12 V bus only to the level of +15 V, so there is no point in overestimating the resistance of the resistor. The idea here is that the higher the resistance, the higher the output voltage. In this case, the voltage will not increase to infinity. The voltage between the +12 V and -12 V rails varies from 5 to 28 V.
You can find the desired resistor by tracing the tracks on the board, or using an ohmmeter.
We set the variable soldered resistor to the minimum resistance and be sure to connect a voltmeter. Without a voltmeter, it is difficult to determine the change in voltage. We turn on the unit and a voltage of 2.5 V is established on the voltmeter on the +12 V bus, while the fan does not spin, and the power supply sings a little at a high frequency, which indicates PWM operation at a relatively low frequency. We twist the variable resistor and see an increase in voltages on all tires. The fan turns on at about +5 V.
We measure all the voltages on the tires
12 V: +2.5 ... +13.5
5 V: +1.1 ... +5.7
3.3 V: +0.8 ... 3.5
12 V: -2.1 ... -13
5 V: -0.3 ... -5.7
The voltages are OK, except for the -12 V bus, and they can be varied to obtain the required voltages. But computer blocks are made so that the protection works on negative buses at sufficiently low currents. You can take a 12 V car light bulb and connect it between the +12 V bus and the 0 bus. As the voltage increases, the light bulb will shine more and more brightly. At the same time, the lamp switched on instead of the fuse will also gradually shine. If you turn on the light bulb between the -12 V bus and the 0 bus, then at low voltage the light bulb glows, but at a certain current consumption, the unit will go into protection. The protection operates at a current of about 0.3 A. The current protection is made on a resistive-diode divider, in order to deceive it, you need to turn off the diode between the -5 V bus and the midpoint that connects the -12 V bus to the resistor. You can chop off two zener diodes ZD1 and ZD2. Zener diodes are used as overvoltage protection, and it is here that current protection also goes through the zener diode. At least from the bus - 12 V it was possible to take 8 A, but this is fraught with a breakdown of the feedback mikruha. As a result, the dead-end path is to cut off the zener diodes, but the diode is completely.
To test the block, you need to use a variable load. The most rational is a piece of a spiral from a heater. Twisted nichrome - that's all you need. To check, nichrome is turned on through an ammeter between the output of -12 V and +12 V, we adjust the voltage and measure the current.
Output diodes for negative voltages are much smaller than those used for positive voltages. The load is correspondingly lower as well. Moreover, if there are assemblies of Schottky diodes in the positive channels, then an ordinary diode is soldered in the negative channels. Sometimes it is soldered to the plate - like a radiator, but this is nonsense, and in order to raise the current in the -12 V channel, you need to replace the diode with something stronger, but at the same time, the Schottky diode assemblies burned out, but the usual diodes are completely pulled well. It should be noted that the protection does not work if the load is connected between different buses without bus 0.
The last test is short circuit protection. We shorten the block. Protection works only on the +12 V bus, because the zener diodes turned off almost all protection. All other buses do not short-circuit the unit. As a result, an adjustable power supply was obtained from a computer unit with the replacement of one element. Fast and therefore cost-effective. During the tests, it turned out that if you quickly turn the adjustment knob, then the PWM does not have time to rebuild and knocks out the feedback mikruha KA5H0165R, and the lamp lights up very brightly, then the input power bipolar transistors KSE13007 can fly out if the fuse is instead of a lamp.
In short, everything works, but it is rather unreliable. In this form, you need to use only an adjustable +12 V bus and it is not interesting to slowly turn the PWM.
Part 2. More or less.
The second experiment was an ancient TX power supply. Such a unit has a button to turn it on - quite convenient. We start the alteration by soldering the resistor between +12 V and the first leg of the TL494 mikruha. A resistor from +12 V and 1 leg is set to 40 kOhm variable. This makes it possible to obtain regulated voltages. All defenses remain.
Next, you need to change the current limits for the negative rails. I soldered a resistor, which I dropped out of the +12 V bus, and soldered 0 and 11 legs of the TL339 mikruha into the bus break. There was already one resistor. The current limit changed, but when the load was connected, the -12 V bus voltage dropped sharply as the current increased. Most likely squanders the entire line of negative voltage. Then I replaced the soldered cutter with a variable resistor - to select the current trips. But it did not matter - it does not work clearly. It will be necessary to try to remove this additional resistor.
Measurement of parameters gave the following results:
|
Voltage bus, V |
Voltage at idle, V |
Load voltage 30 W, V |
Current through the load 30 W, A |
I started soldering with rectifier diodes. There are two diodes and they are quite weak.
I took the diodes from the old block. Diode assemblies S20C40C - Schottky, designed for a current of 20 A and a voltage of 40 V, but nothing good came of it. Either there were such assemblies, but one burned out and I just soldered two stronger diodes.
I stuck cut radiators and diodes on them. The diodes began to get very hot and covered themselves :), but even with stronger diodes, the -12 V bus voltage did not want to drop to -15 V.
After soldering two resistors and two diodes, it was possible to twist the power supply and turn on the load. At first, I used a load in the form of a light bulb, and measured the voltage and current separately.
Then he stopped taking a steam bath, found a variable resistor made of nichrome, a Ts4353 multimeter - measured voltage, and digital - current. It turned out to be a good tandem. As the load increased, the voltage dropped slightly, the current grew, but I only loaded up to 6 A, and the lamp at the input shone at a quarter glow. When the maximum voltage was reached, the lamp at the input lit up at half power, and the voltage at the load dipped somewhat.
For the most part, the change was a success. True, if you turn on between the +12 V and -12 V buses, then the protection does not work, but otherwise everything is clear. Good luck with your remodels.
However, this change did not last long.
Part 3. Successful.
Another alteration was the power supply with mikruha 339. I am not a fan of soldering everything, and then trying to start the unit, so I did this step by step:
I checked the unit for switching on and operation of short circuit protection on the +12 V bus;
I took out the fuse at the entrance and replaced it with a cartridge with an incandescent lamp - it's so safe to turn it on so as not to burn the keys. I checked the block for inclusion and short circuit;
I removed the 39k resistor between 1 leg of 494 and the +12 V bus, replaced it with a 45k variable resistor. Turned on the unit - the voltage on the +12 V bus is regulated within the limit of +2.7 ... + 12.4 V, checked for short circuit;
I removed the diode from the -12 V bus, it is located behind the resistor, if you go from the wire. There was no tracking on the -5 V bus. Sometimes there is a zener diode, its essence is the same - limiting the output voltage. Soldering mikruhu 7905 takes the block to the defense. I checked the block for inclusion and short circuit;
The 2.7k resistor from 1 leg 494 to ground was replaced by 2k, there are several of them, but it is the change of 2.7k that makes it possible to change the output voltage limit. For example, using a 2k resistor on the +12 V bus, it became possible to regulate the voltage up to 20 V, respectively, increasing 2.7k to 4k, the maximum voltage became +8 V. I checked the unit for switching on and short circuit;
I replaced the output capacitors on the 12 V rails with a maximum of 35 V, the 5 V rails with 16 V;
I replaced the +12 V bus coupled diode, it was tdl020-05f with a voltage of up to 20 V but a current of 5 A, I set the sbl3040pt to 40 A, it is not necessary to solder +5 V from the bus - the feedback will be broken at 494. I checked the block;
I measured the current through the incandescent lamp at the input - when the current consumption in the load reached 3 A, the lamp at the input glowed brightly, but the current at the load no longer grew, the voltage dropped, the current through the lamp was 0.5 A, which fit into the current of the native fuse. I removed the lamp and put back the native 2 A fuse;
I turned the blower fan over so that air was blown into the block and the cooling of the radiator was more efficient.
As a result of replacing two resistors, three capacitors and a diode, it turned out to convert a computer power supply into an adjustable laboratory one with an output current of more than 10 A and a voltage of 20 V. The minus is the lack of current regulation, but short circuit protection remains. Personally, I don’t need to regulate this way - the block already gives out more than 10 A.
Let's move on to practical implementation. There is a block, though TX. But it has a power button, which is also convenient for a laboratory. The unit is capable of delivering 200 W with the declared current of 12 V - 8A and 5 V - 20 A.
On the block it is written that it is impossible to open and there is nothing inside for amateurs. So we're kind of like professionals. There is a switch on the block for 110/220 V. Of course, we will remove the switch as unnecessary, but leave the button - let it work.
The internals are more than modest - there is no input inductor and the charge of the input conduits goes through the resistor, and not through the thermistor, as a result there is a loss of energy that heats the resistor.
We throw out the wires to the 110 V switch and everything that prevents us from separating the board from the case.
We replace the resistor with a thermistor and solder the inductor. We remove the input fuse and solder the incandescent bulb in its place.
We check the operation of the circuit - the input lamp glows at a current of approximately 0.2 A. The load is a 24 V 60 W lamp. The 12 V lamp is on. Everything is fine and the short circuit test is working.
We find a resistor from 1 leg 494 to +12 V and raise the leg. We solder a variable resistor instead. Now there will be voltage regulation on the load.
We are looking for resistors from 1 foot 494 to a common minus. Here are three of them. All are quite high-resistance, I soldered the lowest-resistance resistor for 10k and soldered it for 2k instead. This increased the regulation limit to 20 V. True, this is not yet visible during the test, the overvoltage protection is triggered.
We find the diode on the -12 V bus, stands after the resistor and raise its leg. This will disable surge protection. Now everything should be.
Now we change the output capacitor on the +12 V bus to the limit of 25 V. And plus 8 A, this is a stretch for a small rectifier diode, so we also change this element to something more powerful. And of course we turn it on and check. The current and voltage in the presence of a lamp at the input may not grow much if the load is connected. Now, if the load is turned off, then the voltage is regulated to +20 V.
If everything suits, we change the lamp to the fuse. And we give the block a load.
For a visual assessment of voltage and current, I used a digital indicator from aliexpress. There was also such a moment - the voltage on the + 12V bus started from 2.5V and it was not very pleasant. But on the bus + 5V from 0.4V. So I combined the tires with a switch. The indicator itself has 5 wires for connection: 3 for measuring voltage and 2 for current. The indicator is powered by a voltage of 4.5V. The standby power is just 5V and the mikruha tl494 feeds on it.
I am very glad that I managed to remake the computer power supply. Good luck with the change everyone.
This page contains dozens of electrical circuit diagrams and useful links to resources related to equipment repair. Mostly computer. Remembering how much effort and time I sometimes had to spend searching for the necessary information, a manual or a schematic, I collected here almost everything that I used during the repair and that was available in electronic form. I hope someone will find something useful.
Utilities and reference books.
The program is designed to determine the capacitance of the capacitor by color marking (12 types of capacitors).
startcopy.ru - in my opinion, this is one of the best sites on the Russian Internet dedicated to the repair of printers, copiers, multifunctional devices. You can find techniques and recommendations for fixing almost any problem with any printer.
Power supplies.
ATX 250 SG6105, IW-P300A2 power supply schematics, and 2 circuits of unknown origin.
PSU diagram NUITEK (COLORS iT) 330U.
Schematic PSU Codegen 250w mod. 200XA1 mod. 250XA1.
Schematic PSU Codegen 300w mod. 300X.
PSU Diagram Delta Electronics Inc. model DPS-200-59 H REV:00.
PSU Diagram Delta Electronics Inc. model DPS-260-2A.
PSU diagram DTK PTP-2038 200W.
PSU diagram FSP Group Inc. model FSP145-60SP.
Schematic diagram of the Green Tech PSU. model MAV-300W-P4.
HIPER HPU-4K580 Power Supply Schematics
PSU diagram SIRTEC INTERNATIONAL CO. Ltd. HPC-360-302 DF REV:C0
PSU diagram SIRTEC INTERNATIONAL CO. Ltd. HPC-420-302 DF REV:C0
INWIN IW-P300A2-0 R1.2 power supply circuits.
INWIN IW-P300A3-1 Powerman power supply circuits.
JNC Computer Co. LTD LC-B250ATX
JNC Computer Co. Ltd. SY-300ATX Power Supply Diagram
Presumably manufacturer JNC Computer Co. Ltd. Power supply SY-300ATX. The scheme is drawn by hand, comments and recommendations for improvement.
Power Supply Schematics Key Mouse Electronics Co Ltd model PM-230W
Power Master power supply circuits model LP-8 ver 2.03 230W (AP-5-E v1.1).
Power Master power supply circuits model FA-5-2 ver 3.2 250W.
Schematic PSU Maxpower PX-300W
Introduction So, before you is the fourth series of testing power supplies of the ATX standard. This time, eleven blocks from different manufacturers, sold both as part of cases and separately, fell under my hot hand.
The testing of the blocks was carried out in accordance with the method I described - on a constant load, assembled on powerful field-effect transistors and controlled from a computer. Voltage measurements were made both by the Formosa PowerCheck 2.0 unit and by a separate digital multimeter. All oscillograms were taken with an ETC M221 digital oscilloscope with a sweep of 10 µs/div and a sensitivity of 50 mV/div (an HP-9100 oscilloscope probe with a 1:1 divider was used).
Since the original program from Formosa is rather inconvenient for processing the results (slow work, complete lack of settings), I wrote a separate program intended only for viewing and processing the results obtained on the installation:
It allows you to read data files, automatically averaging over a specified number of points, save the processed data to a file, display user-specified currents and voltages on a graph, automatically scale the graph horizontally (splitting it into a user-specified number of pages), manually scale individual sections of the graph, and save the graph or its individual sections in a graphic file.
When processing the results, I averaged the original data over 10 points - since the 1ms period with which the native program saves data is redundant, and averaging allows you to eliminate random noise and thereby improve the appearance of the graph, at the same time reducing the total amount of data.
Regarding the results themselves, I want to note that the power supplies were tested in all permissible modes, including the minimum load on the +12V bus and the maximum load on +5V. In a real computer, such situations do not occur, so I do not consider a small voltage output of + 12V beyond the permissible limits (I remind you that the tolerance for all positive voltages is 5%) is critical. But - only a small one and only for + 12V. If the voltage on the + 12V bus starts to go off scale over 13V, or the well (in theory) stabilized + 5V goes beyond the tolerance - this is a reason to think about the quality of the power supply. For other blocks, the main result is the relative change in voltage over the entire load range - in the tables I give the maximum and minimum observed voltage and their difference in percentage.
I would like to note that all the units under study claim to be able to work with Pentium 4, which requires compliance with the ATX12V standard. Accordingly, from the point of view of this standard, I will consider their quality (compared to ATX in its pure form, it is more demanding on the load capacity of the +12V bus).
Let's get started.
Delta Electronics DPS-300TB rev. 01
This power supply is made by one of the largest PSU manufacturers - Delta Electronics. However, it is of particular interest not only by the eminent manufacturer, but also by the price - they cost around $20, which is very little for a unit of this class.The block makes an extremely pleasant impression with the accuracy of installation - the details of high-voltage circuits are additionally insulated with a heat-shrink tube, all transistors and diode assemblies are put on thermal paste and fixed with M3 bolts with nuts ... On the board, transformer and on the PFC inductor (yes, this power supply is one of the few in review equipped with a passive PFC) is labeled “Lite-On”, but did Lite-On Electronics Inc. only individual components or the entire power supply, and who developed it in the latter case, remains unknown.
The unit is equipped with a fan speed thermostat, and we can safely say that its operation is noticeable - immediately after turning on the fan barely spins and only accelerates to full speed under heavy load. Here I want to note that the fans in the Delta units are relatively weak, designed only for cooling the PSU itself - therefore, a separate exhaust fan must be installed in the computer case. On the other hand, this made the Delta units the quietest I have ever owned.
Of course, all the required filters are carefully soldered - there is a full-fledged surge protector, as well as chokes on all powerful outputs (i.e. + 5V, + 12V and + 3.3V). The capacitance of the input capacitors is 470uF, at the output +12V there is one Chemi-Con capacitor of the “KZE” series and with a capacity of 1200uF, at +5V there are two Rubycon “ZL” 2200uF each, at the output +3.3V there are two Taicon “PW” at 2200uF .
After this, it was difficult to expect a noticeable level of ripple at the output - and the power supply did not deceive my expectations. On the +5V rail, the ripple is almost imperceptible even at maximum load (“virtually imperceptible” on my equipment means that their magnitude did not exceed 5mV), on the +12V rail, the peak-to-peak ripple at maximum load is about 15mV, which is an excellent result.
The voltage range is shown in the table, and on you can see the entire test schedule.
| +12V | +5V | +3.3V |
|
|---|---|---|---|
| min | 11,81 | 4,94 | 3,31 |
| max | 12,92 | 5,15 | 3,39 |
| min/max | 8,6% | 4,1% | 2,4% |
In conclusion, I would like to note one feature of this block, due to which not all motherboards work with it. The fact is that in order to start the motherboard, it is necessary to have a Power OK signal from the power supply, indicating that the supply voltages are within acceptable limits. In the block under consideration, the Power OK signal is generated in the TSM111 chip from STMicroelectronics, which uses an open collector output. This means that for normal operation, a so-called pull-up resistor must be connected between the output and + 5V; there is a place for a resistor on the power supply board, but the resistor itself is not soldered. In the photo below, this is R314 to the right of the chip:
The output is simple - it is enough, without even opening the block itself, to connect between Power OK (gray wire) and + 5V (red wire) a resistor with a resistance of 1 ... 10 kOhm of any power. After such refinement, the power supply should work normally with any motherboards. In order not to immediately lose the warranty on the unit, you can first plug the resistor leads directly into the power connector of the motherboard to check; Then it's better to solder the resistor...
Delta Electronics DPS-300TB rev. 02
Behind the name, which is virtually indistinguishable from its predecessor, is a completely different block. And if the appearance differs slightly (although, taking both of these blocks in hand, you can find that they have a different case design), then the internal structure is radical:
There are no Lite-On inscriptions here anymore - the entire block is made by Delta Electronics. Just like its predecessor, it is equipped with a passive PFC, there is a surge protector and output chokes, all transistors and diode assemblies are mounted on thermal paste ... In general, the blocks are identical in terms of workmanship - there are no complaints to either the first or the second.
Most of all, I was pleased with the level of pulsations - more precisely, their absence. Even at full load and even on a relatively “noisy” +12V bus, the ripples were at the level of extraneous noise, i.e. indistinguishable.
I would also like to separately note the work of temperature control and general cooling of the unit. Even at full load (285W!), only the back wall of the power supply unit opposite the radiators becomes warm, while the air coming out of the fan is still cold, and the fan spins at such a speed that it is almost inaudible. However, this also has a drawback, the same as in the previous block - for normal cooling of the system unit, an additional fan is required on its back wall, which draws hot air from the processor.
The only trouble with this unit arose with the + 5V bus - the power supply limited the current at a level of about 27A. In order not to trigger the protection, the maximum +5V load has been reduced accordingly. However, the total power of the power supply is not lower than the declared one - a proportional increase in the load on the +3.3V bus did not cause the protection to trip.
| +12V | +5V | +3.3V |
|
|---|---|---|---|
| min | 11,80 | 4,98 | 3,31 |
| max | 12,86 | 5,21 | 3,36 |
| min/max | 8,2% | 4,4% | 1,5% |
You can see voltage graphs on.
FKI FV-300N20
This unit, installed in the FKI FK-603 case, is manufactured by Fong Kai Industrial Co.
The surge protector is fully mounted and placed entirely on the main board. Filter capacitors - Fuhjyyu series "LP" and "TM", at the input there are two capacitors with a capacity of 470 microfarads; at the output on the + 12V bus - one 2200 μF, + 5V - 3300 μF and 2200 μF, + 3.3V - two 2200 μF capacitors. On the + 5V and + 3.3V buses there are additional smoothing chokes. The fan speed is controlled by a temperature sensor.
The unit is equipped with four connectors for powering hard drives and CDs and two for powering disk drives. Unfortunately, the wires are 20AWG - despite the fact that the standard recommends thicker 18AWG wires.
The voltage waveforms at the outputs are pleasing to the eye - even at maximum load there are no noticeable ripples. For example, I will give only one oscillogram, +12V bus at a load current of 15A (maximum allowable):
But the block copes a little worse than the already considered Delta blocks:
| +12V | +5V | +3.3V |
|
|---|---|---|---|
| min | 11,49 | 4,86 | 3,31 |
| max | 12,79 | 5,15 | 3,36 |
| min/max | 10,2% | 5,6% | 1,5% |
In general, the block can, perhaps, be attributed to a good, solid middle class.
Fortron/Source FSP300-60BTV
Blocks with the FSP marking are undoubtedly known to readers by the cases of InWin and AOpen - however, recently InWin refused the services of the FSP Group and set up its own production of PSUs.The block looks very solid:
There are no complaints about the internal device - neat installation, a fully assembled surge protector, large transistor radiators, a fan speed thermostat (it is assembled on a separate board screwed directly to the radiator - this can be clearly seen in the photo).
At the input, there are Teapo capacitors with a capacity of 680uF (which is quite good for a 300-watt unit), at the output, the capacitance of the capacitors (using Fuhjyyu of the “TMR” series) is even more impressive - there are two 4700uF capacitors on the + 5V bus, and one 2200uF on + 12V , at + 3.3V - one 3300uF capacitor and another 4700uF, + 5V and 3.3V buses are connected through chokes.
However, oddly enough, the output voltage ripples are quite noticeable, although they lie within tolerances, especially at + 12V:
At + 5V, ripples are also present, but noticeably less in amplitude:
The block holds the voltage + 5V and + 12V very well, but with + 3.3V it was not lucky - it walks by as much as 6%, falling below the minimum allowable (3.14V). Graphs of the dependence of voltage on load, as always, can be viewed on a separate
| +12V | +5V | +3.3V |
|
|---|---|---|---|
| min | 11,91 | 4,92 | 3,12 |
| max | 12,79 | 5,14 | 3,32 |
| min/max | 6,9% | 4,3% | 6,0% |
The unit is equipped with six connectors for connecting hard drives and two for disk drives. All wires are 18AWG, so no complaints can be made from this side.
GIT G-300PT
This Noblesse case block is made by Herolchi (HEC).
Judging by appearance - a typical representative of the middle class, without any outstanding features. The filter is soldered completely, but its first part is placed on a separate scarf (this practically does not occur in expensive blocks). The input rectifier uses CapXon “LP” series capacitors with a capacity of 470uF, and the output rectifier uses Pce-tur and CapXon “GL” series capacitors. The total capacitance of the capacitors on the + 5V bus is 3200 μF, on the + 12V bus - 2200 μF and on + 3.3V - 2670 μF; the choke is provided only on the +3.3V bus. The unit has a fan speed thermostat. To connect the load, there are 5 connectors for hard drives and 2 for drives, all wires are 18AWG.
But the tests, unfortunately, it did not come. The fact is that at a power of about 270-280W, overload protection worked, and when selecting the maximum power in manual mode, the unit died with a loud bang after ten minutes of operation. An autopsy showed that one of the transistors went to a better world, heating up so that a polystyrene insulating washer melted on it:
HEC 300ER
Another block made by Herolchi, but this time it was removed from the Genius Venus 2 case.
Compared to the previous block, the surge protector was halved - the scarf with the first inductor disappeared, but the parts soldered on the main board remained. But the capacitance of the capacitors in the high-voltage rectifier increased to 680uF, and on the + 5V bus - up to 5300uF (two CapXon 1000uF and one Pce-tur at 3300uF). True, as a compensation, this capacitance on the + 3.3V bus decreased to a meager 470 μF, moreover, instead of a choke, there was a “filter jumper” ... and there were no chokes on other buses with high currents in the previous block. The capacitance on the + 12V bus was preserved - 2200 μF, only the manufacturer changed - from CapXon to Pce-tur. In addition to capacitors and chokes, the manufacturer also sacrificed temperature monitoring - in this unit, the fan is connected directly to + 12V. On the other hand, one more connector for powering peripherals has been added - now there are six of them ... Here is such a conservation law.
But the most fun began when trying to remove the characteristics of the block. The problem was that after a little warm-up, the overload protection began to operate at a power of about 200W. And this despite the fact that the block is declared as 300-watt! In fact, at full power, it was only possible to remove the dependence of the output voltages on the load current, which can be seen on , and the minimum and maximum voltage values \u200b\u200bare in the table:
| +12V | +5V | +3.3V |
|
|---|---|---|---|
| min | 11,62 | 4,91 | 3,26 |
| max | 13,27 | 5,15 | 3,31 |
| min/max | 12,4% | 4,7% | 1,5% |
If the block holds the load on the tires + 3.3V and + 5V well, then + 12V can only upset. Looking ahead, I’ll say that both in terms of stability and the absolute value of this voltage, the HEC-300ER took third place from the end, overtaking only IPower blocks.
Exactly the same picture was observed with ripples - if they were kept at a low level on the + 5V bus, then at + 12V they were more than noticeable:
Bus +5V
Bus +12V
Moreover, this oscillogram was taken at a total power of only 185W, because after warming up at a higher power, the unit refused to work stably.
Some time after the start of testing, the unit began to smell of burnt plastic. An autopsy showed the same problem as the GIT G-300PT - a puck began to melt on one of the transistors:
The fate of such a block is predetermined - due to the melting of the puck, the transistor ceases to cling to the radiator and starts to heat up even more ... the puck also melts faster ... a vicious circle leading to the death of the transistor from overheating. What happened after twenty minutes of work at a power of 185W (sic!) - lightning flashed, thunder struck, the fuse evaporated, and the transistor split in half:
Impressive, isn't it?
The conclusion suggests itself that the two burned-out HEC blocks have a serious design flaw - I did not go into details of the circuitry, but such “effects” can occur, say, with too sloping edges of the pulses that switch the key transistors; at the same time, at the moment of switching, a noticeable through current arises, strongly heating the transistors.
iPower LC-B250ATX
Power supply supplied with the E-Star model 8870 “Extra” case. An incomparable example of the work of Chinese engineering:
The work of people who are able to make the power supply work even with so many missing parts inspires respect ... There is no surge protector at all - only jumpers in place of chokes. The same fate befell the output chokes - they simply do not exist. And not only them, but also half of the filter capacitors at the output of the unit - as a rule, two capacitors are placed on each bus, before and after the inductor, but here one of them disappeared along with the inductor. In total, the capacitance of the capacitors of the high-voltage rectifier is 330 μF, the output capacitors on all buses are 1000 μF for each bus, the manufacturer of the capacitors is Luxon Electronics (marked “G-Luxon”). But the savings don't end there! The block does not even have an insulating plastic gasket between the case and the high-voltage part of the circuit ... The quality of the installation is not just low, it is terrible in places - when looking at some parts, it seems that they were simply stuck in as it happened, and then more solder was slapped on top so that it would not fall off ...
Among other things, only four power connectors for hard drives and one for a drive, located on short wires of 20AWG section, can be noted. There is no thermostat, and it was difficult after what he saw to expect to find it.
It is clear that it was difficult to expect miracles from this bloc. He did not show them, but instead showed the instability of the voltage + 12V 15% (not to mention the maximum absolute value of this voltage among all the tested units) and + 5V - 7%.
| +12V | +5V | +3.3V |
|
|---|---|---|---|
| min | 11,52 | 4,89 | 3,21 |
| max | 13,55 | 5,26 | 3,32 |
| min/max | 15,0% | 7,0% | 3,3% |
The graph of voltage changes can be viewed at Moreover, if you look at the individual parts of the graph with an increase (of course, not in the screenshot, but when processing the initial data), it is clear that after a sharp change in the load, the voltages go to a constant level only after about 500ms, which is very slow response to load changes.
The oscillograms were not encouraging either. At +12V, the unit showed the largest ripple range among all tested:
Moreover, when the load power was halved, the range of pulsations decreased only by 10%. However, even at + 5V, the block clearly stood out among the others - the ripple range exceeded 50mV:
Oddly enough, he survived the trials - but, apparently, on his last breath. It became possible to touch the radiators only a quarter of an hour after the unit was turned off, on the group stabilization throttle, the sealant stack on the surrounding capacitors, with which it was filled, melted, and during the testing process, the air blowing from the unit was not even warm, but hot.
IPower LC-B300ATX
Another block from the same manufacturer, this time from the E-Star 8870 “Classica” case.
Evolutionary development of the previous block. A relatively good finning appeared on the radiators, although a poor one appeared in the line filter (wound with a mounting wire in vinyl chloride insulation), but still a choke, both chokes and capacitors were also added at the output. The capacitances of the high-voltage rectifier capacitors have increased to 470uF, the +12V bus output now has a 2200uF CapXon capacitor, +5V has two G-Luxons of 2200uF each, and the +3.3V bus now has two G-Luxons of 1000uF each. Moreover, chokes appeared at + 5V and + 3.3V. The number of power connectors has also increased - now there are five for hard drives and two for disk drives; however, the wires remained thin 20AWG.
But on the insulating gasket between the board and the case, they saved money in this block.
Of course, an increase in the capacitance of the capacitors could not affect the absolute values of the voltages and the stabilization coefficient, and these parameters are as bad as those of a less powerful unit:
| +12V | +5V | +3.3V |
|
|---|---|---|---|
| min | 11,64 | 4,99 | 3,30 |
| max | 13,30 | 5,27 | 3,37 |
| min/max | 12,5% | 5,3% | 2,1% |
But with pulsations it became a little better. On the + 5V bus, they now - thanks to the appearance of a choke and a fourfold (!) increase in the capacitance of filter capacitors - have become insignificant:
However, at +12V, the picture of the “beating of a proud heart, a song about a petrel and the ninth wave” (V. Erofeev, “Journey from Moscow to Petushki”), although it decreased quantitatively, was perfectly preserved qualitatively:
Moreover, such a picture is observed only at a load close to the maximum. At half load, everything is quiet and calm:
Graphs of voltage changes depending on the load can be viewed at.
Macropower MP-300AR-PFC
The fourth (after two Delta and one FSP) block with PFC in this review. This block is installed in the recently launched ASUS Ascot 6AR cases and is actually manufactured by the already familiar HEC company. However, already from a very solid appearance it is noticeable that HEC products are oriented to different consumers, and this block has every chance of being very good.
Inside, the block is very similar to its unsuccessful counterpart - GIT G-300PT; however, looking ahead, I will say that I did not notice any problems with overheating of transistors on the MP-300AR. The unit is equipped with a full-fledged mains filter, the capacitance of the high-voltage rectifier capacitors is 680uF (CapXon “LP” series capacitors are used). At the output on the + 5V bus there is a choke, two Pce-tur capacitors of 1000uF each and one CapXon “GL” at 3300uF; on the +12V bus - one Pce-tur at 2200uF; on the + 3.3V bus - a choke, one Pce-tur capacitor at 1000uF and one CapXon “GL” 2200uF. The fan is switched on through the thermostat.
Separately, I want to note that the block is equipped with as many as eight connectors for powering hard drives; everything else is standard - 2 connectors for floppy drives, ATX, ATX12V and AUX connectors. Of course, full-fledged wires with a cross section of 18AWG are used - the class of the power supply obliges.
Ripple is noticeable, but their swing on the + 5V bus is about 15mV. On the + 12V bus - a little more, about 40mV at full load:
Bus +5V
Bus +12V
With a decrease in load, the range of pulsations decreases, but only slightly. But in terms of stability, the block can also compete with a much more eminent rival - with Delta Electronics... Even though the +12V bus failed a little, but +5V is on top:
| +12V | +5V | +3.3V |
|
|---|---|---|---|
| min | 11,68 | 5,02 | 3,36 |
| max | 12,92 | 5,21 | 3,38 |
| min/max | 9,6% | 3,6% | 0,6% |
In conclusion, I would like to note the not very good location of the passive PFC choke - it is attached to the top cover of the power supply directly behind the fan, blocking part of the air flow.
Samsung SPS300W (mod. PSCD331605D)
This Samsung-made unit was removed from the hull of the Space K-1. Outwardly, it is notable primarily for the location of the fan - it stands on the bottom wall of the block, i.e. inside the computer, but at the same time it blows out of the system unit.
In the internal structure of the unit, unusual radiators attract attention - without fins, but with 90-degree bent and perforated upper parts. However, this is understandable - in this block, the air flow is directed to them from above, and not along the board. The network filter is made almost entirely. “Almost” - because the first inductor is a ferrite ring, on which several turns of the mains wire are wound. The printed circuit board does not make a particularly pleasant impression - some streaks on the upper surface, flux residues on the bottom ...
The high-voltage rectifier uses CapXon “LP” capacitors with a capacity of 330 μF - a little for a 300-watt unit ... At the outputs + 5V and + 3.3 V - through the throttle and two CapXon “GL” capacitors of 1000 μF each; + 12V output - CapXon “KM” capacitor at 2200uF. I would like to dwell on the latter separately - the fact is that the “KM” series are capacitors for a wide range of applications, and “GL” are the so-called LowESR, i.e. with low equivalent series resistance. In switching power supplies, capacitors of wide application are not used, because. due to the high resistance, they can noticeably heat up, which eventually leads to their “swelling” and failure of the power supply. It's hard to say what will happen to this capacitor in a year or two...
The second unpleasant detail is the ATX12V connector. This connector was introduced in addition to the ATX 2.03 standard for systems in which processors are powered by the +12V bus (these are all systems on Pentium 4, dual-processor systems on Athlon MP, and so on). First, the small connector allows power to be fed directly to the CPU's power regulator; secondly, there is only one +12V contact in the ATX connector, and at high current it can heat up until the connector body melts - there are already two such contacts in the ATX12V connector. The Samsung SPS300W block does not initially have an ATX12V connector, but an adapter is included for owners of Pentium 4 systems. The problem is that this adapter is made from an ATX power connector, i.e. the problem with overheating and burning of the contact remains. In case of such troubles, I would advise the owners of this unit to purchase or make an adapter to ATX12V from the hard drive power connector; however, this is not an ideal solution, because there are only four such connectors in the block under consideration.
And third. Testing of this block was carried out with a maximum load on the +3.3V bus equal to 14A (this is the maximum allowable current, despite the requirements of the ATX specification to support current up to 28A) and the maximum total power on the +5V and +3.3V buses equal to 160W.
The output voltage ripples were noticeable, but did not play a significant role - their swing was about 20mV on the +5V bus and about 40mV on the +12V bus, i.e. on the Middle level:
Bus +5V
Bus +12V
But it turned out worse with voltages - firstly, the block keeps the voltage on the + 5V bus rather poorly, even worse than IPower blocks:
| +12V | +5V | +3.3V |
|
|---|---|---|---|
| min | 11,50 | 4,86 | 3,22 |
| max | 12,52 | 5,25 | 3,34 |
| min/max | 8,1% | 7,4% | 3,6% |
Secondly, at zero load, the unit generates voltages that go far beyond the permissible limits - this is clearly seen in the dependence of voltage on current, because. the tests started and ended with zero load. Let me remind you that, according to the requirements of the specification, the power supply must respond normally to attempts to start it at idle, or, if it already produces voltages, keep them within the permitted range.
Well, the last fly in the ointment ... The block could not withstand the full load - it died four minutes after the start of the test. Diagnosis - the diode bridge in the + 5V circuit could not stand it.
Simplex MPT-301
This unit, removed from the DTK WT-PT074W case, is manufactured by Macron Power Co., Ltd.
The surge protector is present in full, half of it is assembled on a separate board, soldered directly to the pins of the network connector. In the input circuits there are Fuh-jyyu “LP” capacitors with a capacity of 470uF; at the output in the + 5V circuit - two Fuhjyuu "TM" capacitors with a capacity of 2200 uF each, in the + 12V circuit - one 3300 uF G-Luxon, in the + 3.3V circuit - a choke and two Fuhjyyu "TM" capacitors of 2200 uF each.
For unknown reasons, the block manufacturer uses non-standard wire colors in the ATX connector: purple +3.3V, orange Power OK and blue -12V. The wires themselves are of the proper 18AWG cross section and carry four power connectors for hard drives and two for drives. Apart from, of course, the standard ATX, ATX12V and AUX.
The +12V ripple range is quite acceptable - about 40mV, but on the +5V bus with more stringent requirements, it could be smaller. On both tires there is a neat “triangle” of a fairly noticeable amplitude:
Bus +5V
Bus +12V
The unit holds the output voltages relatively well, only + 12V let us down a little:
| +12V | +5V | +3.3V |
|
|---|---|---|---|
| min | 11,80 | 5,02 | 3,31 |
| max | 13,18 | 5,26 | 3,33 |
| min/max | 10,5% | 4,6% | 0,6% |
In addition, you can see a problem that has already occurred for IPower units - a slow reaction to a sudden change in load, when the output voltages do not reach a constant level until a few hundred milliseconds after the load change.
