Voltage stabilizer, short-circuit protected output, 21/2-12 volts 0,3 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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On fig. 1.19 shows a diagram of a transistor parametric voltage regulator based on a composite regulating transistor VT2, VT3 with an output short-circuit protection device on the transistor VT1.
The rated input voltage of this stabilizer is 21 V, the load current is 0,3 A, the output voltage range is 2 ... 12 V.
The protection device works as follows. A stable bias voltage of about 1 V is applied to the base of transistor VT1,7 from diodes VD1 and VD2 (used as stabistors). Together with resistor R1, they form an input voltage divider. In the absence of an output overload, the transistor VT1 is closed, since the potential of its base relative to the emitter is positive.
When the output is short-circuited, the emitter of the transistor VT1 closes to the "common plus". As a result, the potential of its base relative to the emitter becomes negative, and the transistor opens. Its collector current passes through the resistor R2, the voltage drop across it increases, the negative bias at the base of the transistor VT2 decreases sharply and the composite control transistor goes into a state close to the "closed" state. Thus, the short circuit current is limited. As soon as the load short circuit is eliminated, the base of the transistor VT1 will again receive a positive bias, and the normal operation of the stabilizer will automatically be restored.
Author: A.Mironov
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