Power supply, 12 volts 20 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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On fig. 3.26 shows a diagram of a stabilized power supply 12 V 20 A. The T1 network transformer is designed for a power of 450 W and has a secondary winding of 15 V. The main stabilizer is the DA1 K142ENZ IC. Resistor R1 sets the current limit. Resistors R4....R6 are equalizing and are made of wirewound resistors. Transistors VT1 ... VT3 are placed on a heat sink capable of dissipating more than 100 W, the DA1 chip is also installed on a small heat sink. If you do not have the opportunity to install a sufficient heat sink area, then for better cooling you need to install a small additional fan.
(click to enlarge)
Another simple but powerful power source, made on powerful compound transistors (Fig. 3.27), is quite suitable not only for charging car batteries, but also for powering various electronic circuits. The output voltage of the device is adjustable from 0 to 15 V.
The current depends on the degree of discharge of the batteries and can reach 20 A. Since the cathodes of the diodes and the collectors of the transistors are interconnected, all these parts are placed on one large radiator without insulating gaskets. If there are no special requirements for voltage stability, then the resistor R1 and the zener diode VD3 can be excluded from the circuit. By adding the capacitances shown in the dotted line in the diagram, you can use the device as a power supply.
Author: Semyan A.P.
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