SU1545209A1 - Dc voltage stabilizer with overvoltage protection - Google Patents

Abstract

This invention relates to electrical engineering and can be used in secondary power supply sources. The aim of the invention is to increase functional reliability. In addition to the main regulating element 1, the stabilizer contains a backup regulating element 2 to which the load is switched in case of overvoltages at the output of the main one. If the latter is in good condition, the voltage at its output will return to normal, and the load will switch back. Reliability is enhanced by the absence of a delay in the operation of the protection device and an interruption in the transfer of energy to the load. 1 hp f-ly, 1 ill.

Description

one

(21) 4283472 / 24-07

(22) 06/01/87

(46) 02.23.90. Bul 7 (72) A.Yu. Movshovich

(53) 621.316.722.1 (088.8)

(56) USSR Author's Certificate P 349990, cl. G 05 F 1/569, 1970.

Sources of power supply of electronic equipment. / Handbook. Ed. G.S. Nayvelt. - M .: Radio and Communications, 1985, p. 170-181, fig.5.13a.

(54) CONSTANT VOLTAGE STABILIZER WITH OVERVOLTAGE PROTECTION

(57) The invention relates to electrical engineering and can be used in

sources of secondary power supply. The aim of the invention is to increase functional reliability. In addition to the main regulating element 1, the stabilizer contains a backup regulating element 2 to which the load is switched in case of overvoltages at the output of the main one. If the latter is in good condition, the voltage at its output will return to normal, and the load will switch back. Reliability is enhanced due to the absence of a delay in the operation of the protection device and an interruption in the transfer of energy to the load, 1 hp f-ly, 1 ill.

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about with

The invention relates to electrical engineering and can be used in sources of secondary power supply.

The purpose of the invention is to increase the functional reliability by reserving the power circuit and ensuring a return to the main power circuit after switching to the back-up one in the case of the health of the first one.

The drawing shows a functional DC voltage regulator circuit with overvoltage protection.

The stabilizer contains the main I and reserve 2 regulating elements, the same inputs of which are combined, connected between the input 3 and output 4 terminals through the opening contacts 5 of the self-locking relay 6 and the opening 7 and the closing 8 contacts of the additional relay 9, the main 10 and the additional 11 threshold elements, inputs which are connected to the outputs of the reserve and main regulating elements, respectively, and the outputs, respectively, with a self-locking and additional relay, control unit 12, the input of which is connected to the output This output and the output to the control inputs of the regulating elements.

The device works as follows.

When overvoltage occurs at the output of the stabilizer, an additional threshold element 1 1 triggers an additional relay 9, which by its contacts 7 and 8 switches the load connected to output terminal 4 to power from the backup regulating element 2. If the main regulating element 1 If the overvoltage is caused by a transient, the voltage at the output of element 1 returns to normal, the threshold element 11 turns off the relay 9, and the stabilizer continues working on the main control element 1,

If the regulating element 1 is broken, then the voltage at its output will remain high, and the stabilizer will operate on the backup regulating element 2. In the case of overvoltage at the output of element 2, the threshold element 10 will turn on the self-blocking relay 6, which

Q 5

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,

0 5 Q

cycles 5 open circuit stabilizer supply.

In order to protect the control unit 12 during the breakdown of the transistor of the regulating element, a diode is included in its base circuit.

When the control unit 12 is powered from an additional source connected to the input terminal 3, a diode is connected to the collector circuit of the latter to prevent it from shorting.

The proposed voltage regulator with overvoltage protection at the output has a higher functional reliability as compared with the known stabilizers: there are no delay elements in the operation of the protection device and there is no interruption in the energy transfer to the load.

Claims (2)

1. DC voltage regulator with overvoltage protection, containing disconnecting contacts of a self-locking relay connected in series between the input and output pins and a regulating element, a control unit, an input connected to the output output, and an output to the control input of the regulating element, and a threshold an element connected to a self-blocking output, with a relay, characterized in that in order to increase functional reliability, a backup regulating element was inserted into it, the leaves of which are combined with the corresponding inputs of the regulating element, an additional relay, the opening contacts of which are connected between the output of the regulating element and the output output, and the closing contacts between the output of the backup regulating element and output output, and an additional threshold element, the input connected to the output of the regulating element, and the output - with an additional relay, and the input of the threshold element p dklyuchen to enter the reserve of the adjusting member. 2. Stabilizer according to claim., About tl and - h and y and i with the fact that each i 51545209 the regulating element is made on - and the base circuit of which includes a transistor connected in accordance with the circuit c, diodes in the conducting direction. common collector to the collector