Power supply for the transceiver from an AT/ATX computer power supply. Part 1. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Computers
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Step-by-step instructions for converting a computer power supply for use with a transceiver.
1. It is necessary to remove all parts for -12, -5 and +5 volts. I have removed the diodes, capacitors, inductors and terminating resistors for these voltages. All this takes up a lot of space.
2. Rewind the winding nodes for +12 volts with a thicker wire. Choke for +12 volts I wound wire 1.3. For 1 volt, 1.5 turns, that is, 20-21 turns. It can also be wound in two wires, with a 0.6 wire. The winding must strongly apply to the core. Things are more complicated with the transformer, it is very difficult to disassemble it (It is flooded with something Chinese, Hi!). If you make it out, try winding it with a thicker wire. Count the turns and wind the same + 8-10 turns (We sometimes have 190 volts in the network).
3. Replace the rectifier diodes for +12 volts with an assembly of 30A 45V Schottky barrier diodes. I applied assembly 30CPQ045. (Maybe other manufacturers have this assembly called differently). The use of domestic diodes gave unsatisfactory results. - large voltage drop. Diodes KD 2998 gave a drop of about 1.1 volts under load.
4. Break the track on the board that went to the first leg of the TL494. Through a resistor divider, apply voltage to this first leg of the microcircuit. (Many thanks to A.Yu. Sidelnikov 4L1AW). By this we force the microcircuit to count the voltage we need +12 volts. In the original version, it counts the total voltage, where +5 volts is dominant.
5. By selecting the values of the resistors of the divider, I set the desired voltage at the output of +14 volts.
Everything I did is shown in the schematic diagram below in fig. 1. A photograph of the resulting power supply is shown in fig. 2. The source has been tested in the most severe mode. The voltage drop at 18A was 0.3V. Oddly enough, the PSU works. I think everything is easy and simple. And after the alteration, you will have a light and small PSU available. If you have any suggestions or comments, please write to my E-mail.
Author: David Devdariani, 4L1DA, 4l1da@rambler.ru; Publication: cxem.net
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