SU1061122A1 - Device for protection of constant voltage stabilizer - Google Patents

Abstract

DEVICE FOR PROTECTING A CONSTANT VOLTAGE STABILIZER containing a relay, the winding of which through a resistor is connected at the output of the protected stabilizer, and the closing contacts are connected between the output for connecting the source i of the power supply and one of the input terminals. a stabilizer, a start button and a node for overvoltage and overcurrent, included at the output of the stabilizer, and an effective executive transistor, one of the output terminals of which is connected to one of the terminals of the relay, which, In order to reduce the current consumption, the opening contacts of the start button are connected between the common connection point of the resistor and the relay coil and the other output terminal of the actuating transistor, and the voltage between the specified Common point and one of the terminals corresponding to l p- to connect the power source. .

Description

The invention relates to electrical engineering and can be used.

in various power supplies of radio equipment and automation.

A device for protecting a DC voltage regulator is known, which contains a relay, the closing contacts of which are included in the input circuit of the protected stabilizer, a current overload detection unit, and actuators £ 1J.

However, the known protection device is complex and contains multi-stage cascades in the executive protection path.

The closest in technical essence to the invention is a device for protecting a DC voltage stabilizer, containing a relay, the winding of which through a resistor is connected to the output of the protected stabilizer, and the make contacts are included in the input circuit of the stabilizer, the start button, the make contacts of which are connected in parallel with the relay contacts and node for detecting overvoltage and overcurrent, included at the output of the stabilizer and having an executive transistor, the output of which is connected parallel to the relay coil terminals __ [2].

A disadvantage of the known device is that it has povviennoe current consumption associated with _e in that in the nominal operating mode stabilizer relay coil consumes slightly larger operating current relay, and modes of overcurrent and overvoltage this current consumes executive transistor until opening relay contacts.

The aim of the invention is to reduce current consumption.

This goal is achieved by the fact that in the device for protecting a DC voltage regulator containing a relay, the winding of which is connected through a resistor to the output of the protected stabilizer, and the make contacts are connected between the output terminal for connecting the power source and one of the input terminals of the stabilizer, the start button and the overvoltage detection unit and overcurrent current, included at the output of the stabilizer and having a performer. a transistor, one of the output terminals of which is connected to one of the terminals of the relay winding, the opening contacts of the start button are connected between the common point of the resistor and the relay winding and the other output terminal of the executive transistor, and the closing between the specified common point and one of the terminals of the corresponding polarity for power supply connection.

The drawing shows a schematic diagram of a device for protecting a DC voltage stabilizer.

The device contains a relay with a winding 1 and NO contacts 2, a resistor 3, a node 4 for detecting overvoltages and overcurrents with an executive transistor 5, a start button 6.

The protection device operates as follows.

When button 6 is pressed, the relay winding is connected to the power source, as a result of which contacts 2 are closed, which are subsequently closed (after releasing button 6), so. ”How the relay winding is energized via resistor 3 from the output of the stabilizer. In this case, the resistance value of the resistor 3 is selected from the condition of providing a holding current through the winding. In the nominal mode of operation of the stabilizer, the transistor 5 of node 4 is locked. If the transistor 5 turns on when an overload factor appears (overvoltage or overcurrent), then it blocks the relay winding, taking over the winding current, as a result of which the relay is released, and contacts 2 open, disconnecting the stabilizer.

After removing the overload factor, the stabilizer can be turned on again by pressing the button, LI 6.

Thus, as a result of the introduced connections, the current consumption of the device. decreases, since in the nominal mode the relay does not consume the tripping current, but only the holding current, which is significantly less.

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Claims (1)

DEVICE FOR PROTECTING A STABILIZER OF DC VOLTAGE, containing a relay, the winding of which through a resistor is connected to the output of the protected stabilizer, and the closure; Repenting contacts are included between you ^! water for connecting the source: power and one of the input terminals of the stabilizer, a start button and a node for detecting overvoltage and overcurrent, connected to the output of the stabilizer and having an executive transistor, one of the output terminals of which is connected to one of the terminals of the relay winding, ohm and h a) in order to reduce current consumption, the opening contacts of the start button are connected between the common connection point of the resistor and the relay winding and the other output terminal of the executive transistor, and the closing contacts are between indicated by the Common point and one of the conclusions of the corresponding polarity for connecting the source- $ Taniya. yo yo>