Power supply for car transceiver, 13 volts 20 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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Car transceivers consume significant current during transmission - up to 20 A. Creating a mains power supply for such devices is a serious problem. On fig. 3.32 shows a schematic diagram of such a power supply.
The secondary winding of the transformer must be designed for a current of 20 A and a voltage of 20 V. The bridge diodes are mounted on radiators, it is better to use power diodes with a Schottky barrier.
The stabilizer with short circuit protection is made on transistors VT1 ... VT7. The output voltage is set by a tuned resistor. The error signal amplifier is made on the differential stage VT6, VT7. A follower on a composite transistor VT5 controls the regulating transistors VT1 ... VT4, in the emitter circuits of which equalizing resistors of 0,12 Ohm are included, which ensure uniform current distribution across all four transistors (5 A each). Mains rectifier, filter capacitors and transistors VT1...VT4 are installed outside the board. Collectors VT1...VT4 are galvanically connected to the chassis, which allows using the chassis as a heatsink without insulating gaskets. As VT1 ... VT4, you can use KT819, VT5 - KT827, VT6 and VT7 - KT814 with any letter index. The printed circuit board is shown in fig. 3.33.
Author: Semyan A.P.
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