SU1260929A1 - D.c.voltage stabilizer - Google Patents

Abstract

The invention makes it possible to increase the reliability of the protection of a constant voltage stabilizer. It contains the regulating element 1 at the feed-through 2 and matching 3 transistors, the current-to-switch two-terminal k, consisting of the bias circuit 6, made on the optocoupler 7 light emitter and the key element 8, the limiting resistor 9, the divider 11, the transistor 5. In the case of current overload or short circuit At the output of the stabilizer, the collector current of the transistor 3 rises sharply, the light emitter 7 turns on the photodetector 10, through which a blocking potential is applied to the emitter of transistor 5, which turns on the transistor 5 and adjusts The switching element 1. At the same time, the voltage drop across the resistive divider II sharply increases, thereby locking the key element 8. Thus, in the stabilizer, when the protection trips, the bias circuit and the transistor are simultaneously disconnected, which increases the reliability of the stabilizer protection. 2 hp f-ly, 1 ill. (Q (L N5 About about ts5 About

Description

The invention relates to electrical engineering and can be used in power supply devices for electronic equipment.

The purpose of the invention is to increase the reliability of the protection operation.

The drawing shows a circuit diagram of a constant voltage stabilizer.

The constant-voltage regulator contains a regulating element 1, made on pass 2 and matching 3 transistors, current-stabilizing two-pole 4 on transistor 5, the collector of which is connected to the base of the bias, connected in parallel to the pass-through transistor and consisting of connected in series

the light emitter 7 of the optocoupler, the key 20 matching transistors, the tokostable element 8 and the limiting resistive two-pole of transistor 9, and the collector of which is connected to the light point of the transducer 7 to the light source of the matching transistor-and the high B is connected. the collector is matching the feedback amplifier, the bias transistor 3.25 bias circuit connected in parallel

The zmitter of the transistor 5 of the current-stabilizing two-port 4 is connected via a photodetector O of the optocoupler to a common bus and through a resistive divider

a pass-through transistor, which includes a series-connected resistor and an optocoupler LED, one pin of which is connected to the collector fl, the midpoint of which is connected to the pass-through transistor, to the emitter

one of which is connected to the terminals of the resistor, the other output of which is connected to the base of the current-to-two-pole two-port transistor, the emitter of which is connected to the common bus through the photoreceiver of the optocoupler. in order to increase the reliability of the protection, in non-. A resistive divider and, in the normal state, a controllable key element, a switching circuit of the key element 8, is supplied between the other output of the LED and is connected to the control circuit of the key element 8, to the input circuit of the regulating element 1.

Key element 8 can be performed on a lockable thyristor 12 (or transistor),

The device works as follows.

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There is a positive signal with respect to its output terminal, as a result of which the thyristor 12 is open (the transistor is in the saturation state).

When a current overload or short circuit occurs at the output of the stabilizer, the collector current of the matching transistor 3 sharply increases, as a result of which the energy of the light emitter 7 becomes sufficient to turn on the photodetector 10, through which a blocking potential is applied to the emitter of the transistor 5, which turns off the transistor 5 and the regulating element 1 stabilizer. At the same time, the voltage drop across the resistive divider 11 sharply increases, causing key element 8 (thyristor or transistor) to be locked and current flowing through the bias circuit 6 to stop. Thus, the proposed device allows the protection circuit to shunt about the transistor, thereby making the stabilizer protection operation reliable.

Claims (3)

Invention Formula A constant voltage stabilizer containing a regulating element connected in series to the power bus, executed at the feedthrough and a through-transistor including a series-connected resistor and an optocoupler LED, one you the throne and the base of the current-stabilizing two-pole transistor, the emitter of which is through a resistive divider. connected to the collector of the transistor, and the control circuit of the lockable key element is connected to the midpoint of the specified resistive divider. 2, Stabilizer according to claim 1, 1, which is based on the fact that the lockable key element is made on the lockable thyristor. 3. The stabilizer according to claim 1, in which the lockable key element is made on a transistor.