SU1201822A1 - D.c.voltage stabilizer - Google Patents

Abstract

The invention makes it possible to increase the operational capabilities of a DC voltage regulator (SNPT) under operating conditions with a pulsed load due to the fact that in a SNTPT consisting of a regulating element (RE) with a control unit, a current sensor (DT) connected between In. code output and re, a key threshold element connected to the DT, and an output through the pulse shaper and a resistor to the base of the first transistor switch connected between the control input of the RE and the common bus, an additional DT and the second trans are introduced istorny key, wherein the additional DT is connected between the common schinoy and one plate of the filter capacitor, whose other armature is connected to the output terminal, an additional output is connected to the DT bazoemitternomu transition of the second transistor switch having its collector connected to the output of the key threshold element. i

Description

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The invention relates to electrical engineering, namely to power sources, and can be used in systems, power supply of electrical and radio devices, automation, communication, telemechanics.

, The purpose of the invention is to expand the operational capabilities under the conditions of operation with a pulsed load.

  The drawing shows a functional diagram of the proposed DC voltage regulator.

The stabilizer contains the first current sensor 1 connected between the input output and the regulating element 2, the key threshold element is the optocoupler 3 connected by a light emitter parallel to the current sensor 1, and a photo-receiver connected to the pulse shaper 4, for example, a single-oscillator, the output of which through a current-limiting transistor 5 is connected to the base the first transistor switch 6, connected by an emitter with a negative common bus 7, and a collector - with a control input of a regulating element 2, for example, a transistor o with a positive output terminal 8. Between the common power bus 7 and the terminal 8, the comparison circuit 9 and one output of the filtering output capacitor 10 are connected, the other terminal of which is connected via the second current sensor 11 to the negative common power bus 7, the common point of the current sensor 11 and the filtering the capacitor 10 is connected to the base of the second transistor switch 12, the coil of which is connected to the output of the optocoupler 3, and the emitter - to the common bus 7. Output comparison circuits 9 are connected to the corresponding inputs of the operational amplifier 13, the output of which through the current limiting resistor 14 is connected to the control input of the regulating element 2,

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The device works as follows.

In the steady state mode, the device operates as a classical compensatory stabilizer, while in the absence of an overload or short circuit, the voltage from the first current sensor 1 is less than the pickup threshold of the optocoupler 3 and therefore the output of the one-oscillator 4 is low Closed state.

In the case of an increase in the load current or in the presence of a short circuit, the current through the first current sensor 1 increases and the voltage across it increases accordingly. When the threshold is reached

the optocoupler 3, a single-shot 4 is transferred and a positive voltage appears at its output, which opens the transistor switch 6 and the voltage across

the control input of the regulating element 2 is reduced and it closes, while no current flows through the load. In this state, the stabilizer remains until the end of the one-shot pulse 4. If the overload mode or short circuit in the load persists, when the one-shot 4 returns to its initial state, the control element 2 opens and the current increases to a value above the threshold.

Repeated operation of the protection node. The protection circuit will operate until the overload condition or short circuit at the output of the stabilizer is eliminated. Then when opening the regulating element 2, the current through

0 the load will not exceed the threshold value, but the filtering charge will occur. a capacitor 10 connected to the output of the stabilizer. The charge current of the capacitor 10 creates

connected to it is the second current sensor 11 voltage, which is applied to the base of the second transistor switch 12 and opens it. At the same time, the load current simultaneously on the first current sensor 1 creates a voltage that opens the optocoupler 3, however, transistor switch 12 bypasses the input of the one-oscillator 4 and the operation of the one-oscillator 4 does not occur. Upon completion of the charge of the capacitor 10, the voltage on the second current sensor 11 decreases and the second transistor switch 12 closes. In the event of an overload of the stabilizer, the increasing load current creates a voltage above the threshold value 1 on the first current sensor 1, and the optocoupler 3 is opened, and then the one-shot 4 is triggered, which opens transistor switch 6 and locks the control element 2. If the one-shot pulse ends 4, the overload mode is retained, then the one -frame is repeated 4. If the overload mode is eliminated, the one-shot 4 is not triggered and the actuator enters the working mode. them .

Due to the means introduced, it became possible, under the pulsed nature of the load, to detect the charging current of the filtering capacitor from overload currents that occur, in particular, during short circuits, and to lock the protection node for the duration of the charging of the filtering capacitor. This leads to the expansion of the operational capabilities of the proposed stabilizer with a pulsed nature of the load.

Claims (1)

Invention Formula A DC voltage jam has a regulating element, a comparison node, an input connected to a common bus to the output output, a DC amplifier connected by inputs to the corresponding outputs of the comparison node, and an output to a control input of the regulating element, the first current sensor connected between the regulating element and the input terminal, the key threshold element, the input connected to the specified current sensor, and the output - to the input of the pulse shaper, the output of which is via the resistor chen database the first transistor switch, the collector of which is connected to the control input of the regulating element, and the emitter - to the common bus connected to the filtering output capacitor, characterized in that, in order to spread the operational capabilities under the conditions of operation with a pulse load, a second current sensor; making the specified connection between the common bus and the filter capacitor, and the second transistor switch connected to the output of the key threshold element by a collector, the emitter to the common bus and the base to the common connection point of the filter capacitor and the second current sensor. S -o /about / U