A simple voltage regulator with short circuit protection, 15-38 volts 3 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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The stabilizer (Fig. 3.5) provides an adjustable voltage on the load from 15 to 38 V at a rated input voltage from the rectifier of 42 V. The load current is up to 3 A. The stabilization coefficient is at least 300, the amplitude of the output voltage ripple is not more than 5 mV.
The low output impedance is due to the presence of a current feedback circuit. The feedback voltage is removed from the resistor R7 and enters the base circuit of the transistor VT2.
The power transformer of the stabilizer with a power of about 100 watts. Transistor VT1 can be used types KT803A, KT808A. VT2 - any of the GT321 series. Transistor VT1 should be installed on a radiator capable of dissipating up to 70 W of thermal power. If, with a decrease in the output voltage, the input voltage from the rectifier is correspondingly reduced, the dimensions of the radiator can also be significantly reduced.
Author: Semyan A.P.
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