Voltage stabilizer for powering UMZCH, 19 volts 20 amperes. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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This voltage regulator (Fig. 3.11) consists of two parametric stabilizers assembled on zener diodes VD1 and VD2 and resistors R3, R4, and emitter followers on transistors V1, VT2 and VT3, VT4. It was possible to increase the stabilization coefficient due to the fact that the output voltage of another was used to power the reference voltage source of one stabilizer.
The output voltage of the stabilizer is -19 and + 19 V, the maximum load current is up to 20 A, the output resistance does not exceed 0,02 Ohm. The stabilization factor is at least 1000. To work with it, two galvanically uncoupled rectifiers are required.
The voltage on the step-down windings of the power transformer is 24 V. The possibility of self-excitation of the stabilizer is reduced by the use of transistors with different cutoff frequencies in emitter followers (KT825G and KT827B are low-frequency, and KT315G and KT361 are high-frequency).
The stabilizer is protected against a short circuit in the load. Regardless of which arm the short circuit occurred, both stabilizers are turned off.
Author: Semyan A.P.
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