SU836631A2 - Device for protecting dc voltage stabilizer - Google Patents

Description

The invention relates to electrical engineering and can be used in stabilized power sources.

By main auto No. 218976, a device is known comprising regulatory and protective transistors, ⁵ DC amplifier. The base of the protective transistor through the limiting resistor is simultaneously connected to the negative pole of the source. input voltage, to the emitter ^{, 0} ru of the transistor of the DC amplifier and to the anode of the zener diode, the cathode of which is connected to the positive pole of the aforementioned source flj.

A disadvantage of the known device is the inability to start the stabilizer on its own, due to the fact that at the time the circuit is turned on, the protection circuit is activated, closing the transistor.

The purpose of the invention is the provision of self-starting voltage regulator.

The goal is achieved that the transistor is inserted into the device, the base of which is connected through the input resistor to the input terminal and through the introduced capacitor to the common bus, the collector to the emitter of the protective transistor, and the emitter to the output of the stabilizer.

The drawing shows a schematic diagram of the proposed device. .

The device contains a protective transistor 1, the collector of which is connected to the base of the regulating transistor 2, a limiting resistor 3 connected between the base of the protective transistor and the anode of the zener diode 4, the collector transistor 5 of which is connected to the emitter of the protective transistor, and the base with a capacitor 6 and resistor 7.

When the stabilizer is turned on, the additional transistor is closed, since the voltage on the capacitor 6 is off.

The transistor 1 is closed and does not affect the operation of the circuit, as a result of which the circuit starts normally. After charging the capacitor 6 through the resistor 7, the transistor 5 is saturated and connects the emitter of the transistor 1 to the output bus of the stabilizer. The protection circuit is being prepared for work.

I

The introduction of the transistor 5, the base of which is connected through the resistor to the input of the stabilizer and through the capacitor to the common bus, the collector to the emitter of the protective transistor, and the emitter to the output of the stabilizer, made it possible to independently start the voltage stabilizer,

And .4

Claims (1)

(54) The DEVICE FOR PROTECTING THE CONSTANT VOLTAGE STABILIZER 3 is switched on and the transistor 1 is closed and does not affect the operation of the circuit, as a result of which the circuit starts normally. After charging the capacitor 6 through the resistor 7, the transistor 5 is saturated and connects the em of the transistor 1 to the output bus of the stabilizer. The protection scheme is prepared for operation. The introduction of the transistor 5, the base of which is connected through a resistor to the input of the stabilizer and through a capacitor to the common bus, the collector to the emitter of the protective transistor, and the emitter to the output of the stabilizer, allowed to start the voltage stabilizer 1 independently. 4 The invention The device for the protection of a DC voltage regulator by the author. St. No. 218976, characterized in that, in order to provide an independent starting-voltage regulator, a transistor is inserted in it, the base of which is connected via an input resistor to an input terminal and through an injected capacitor to a common busbar , and the emitter - with the output of the stabilizer. Sources of information taken into account in the examination 1. USSR Author's Certificate No. 218976, cl. H 02 H 3/24, 1967.