Voltage stabilizer 21/2-12 volts 0,3 amps, protected from output short circuits. Scheme, description

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Voltage stabilizer 21/2-12 volts 0,3 amps, output short circuit protected. Encyclopedia of radio electronics and electrical engineering

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The figure shows a diagram of a transient parametric stabilizer on a composite regulating transistor T2, T3 with an output short-circuit protection device on transistor T1. 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.

Voltage stabilizer 21/2-12 volts 0,3 amps, output short circuit protected

The protection device works as follows. A stable bias voltage of about 1 V is applied to the base of transistor T1,7 from diodes D1 and D2 (used as stabistors). Together with resistor R1, they form an input voltage divider. In the absence of an output overload, the transistor T1 is closed, since the potential of its base relative to the emitter is positive. When the output is short-circuited, the emitter of transistor T1 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 T2 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 short circuit of the load is eliminated, the base of the transistor T1 will again receive a positive bias, and the normal operation of the stabilizer will automatically be restored.

Publication: cxem.net

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