SU1439559A1 - D.c. voltage stabilizer - Google Patents

Abstract

The invention relates to electrical engineering and can be used in the sources of secondary power supply of electronic equipment. The purpose of the invention is to increase reliability by reducing the temperature drift of the current from the output current overload protection circuit and increasing the slope of the thermal protection circuit. The device contains an error signal amplifier, circuit-wise combined with a reference voltage source, a regulating element made on a pnp transistor, the first and second matching transistors, an output voltage divider, a static mode setting node, a thermal protection circuit overload current output and nascet-. nor regulatory element. The goal is achieved by increasing the steepness of the operation of the thermal protection circuit and, with the right choice of parameters, by the low temperature drift of the operation current of the output current overload protection circuit. It is advisable to manufacture the device using semiconductor integrated technology, which allows minimizing its dimensions and mass. 1 il. F (L

Description

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

The aim of the invention is to increase the reliability of the stabilizer by reducing the temperature drift of the current response of the output current overload protection and increasing the thermal steepness of the thermal protection.

The drawing shows a circuit diagram of a voltage regulator.

The constant voltage regulator jj does not contain the amplifier 1 of the error signal, which is schematically and mechanically combined with the source of the Reference eg. regulating transistor 2, i the first 3 and second 4 transistors, 20 divider 5 vbdnogo voltage, the task node of the Static mode, which includes the third transistor 6, the fourth 7 and fifth 8 two-collector transistors, Zener diode 9, the first 25 10 and the second 11 resistors, a thermal protection node, made on the sixth transistor 12, an overload protection node for the output current and against the full-regulating transistor 2, 30

including the seventh 13 and eighth 14 transistors, the third 15 and fourth 16 resistors, the input of the amplifier 1 is connected to the output of the divider 5, the input of which is connected to the output bus 17 and to the collector of transistor 2, the output of the amplifier 1 is connected to the base of transistor 3 and to the collector of transistor 12, the emitters of which are connected to the busbar, to it by bus, to the cathode of the Zener diode 9 and to the common leads of amplifier 1 and divider 5. The collector of transistor 3 is connected to the base of transistor 4 and to the first collector of transistor 8, the second collector which is connected to the emitter, t of the transistor 4 and with the base of the transistor 2, the base of the transistor 8 is connected to the combined base and the first collector of the transistor 7 and to the collector of the transistor 6, the base of which is connected to the second collector of the transistor 7 and the cathode-Zener diode 9, are connected with the emitter of the regulating transistor 2 and with the input bus 18, the emitter of the transistor 6 is connected 55 to the first terminal of the first resistor 10, the base of the transistor 12 is connected to the first terminal of the second resistor 11,

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the emitter of the transistor 13 is connected to the first output of the third resistor 15, and the base of the transistor 13 is connected to the first output of the fourth resistor 16, the first collector of the transistor 19 is connected to the output bus G /, the base to the base of the regulating transistor 2, and the emitter is connected to the input bus 18 , the second collector of transistor 19 is connected to the collector of transistor 14 and the emitter of transistor 13 and through the third resistor 15 is connected to the common bus, the base of transistor 12 is connected to the collector of transistor 13, the second output of the second resistor 11 is connected to the base of the transistor torus 13, the base of the transistor 14 is connected to the connection point of the second terminals of the first 10 and the fourth 16 resistors, and its emitter is connected to the emitter of the transistor 6. In this case, the transistors 2,4,7, B and 14 have a p-p conductivity - - na, and the rest pnp type.

In the voltage stabilizer, the thermal protection node and the output current protection node are schematically combined. The sensor of the load current and the voltage of the regulating transistor is a functionally integrated element — transistor 19, which has a special technology of active regions.

The stabilizer works as follows.

When the voltage changes, the error signal through the divider 5 is applied to the input of the amplifier 1 of the error signal and then through the transistors 3 and 4 acts on the base of the regulating transistor 2. At the same time, the output of the transistor 2 is an increment of current that compensates for the initial change output voltage When the crystal temperature exceeds a certain level, transistor 14 opens j its collector current dramatically increases the potential at resistor 15, transistor 12 opens and closes transistor 3, and hence the regulating one. transistor 2.

The increase in the slope of the operation of the thermal protection circuit of the device is achieved due to the presence of a current amplifier on the transistor 12.

The protection current of the node; you are defined by the following expression:

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the ratio of the areas of the first and second collectors of the transistor 19; the ratio of the areas of the emitters of the control transistor 2 and the transistor 19;

emitter voltage difference - base of transistors 12 and 13;

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the voltage drops at zener diode 9 and emit39559.

of the static mode, consisting of the third transistor, the fourth and fifth dual-collector transistors, the Zener diode, the first and second resistors, the heat protection node made on the sixth transistor, the output current overload protection node and from the regulating

1Q transistor, made on the seventh and eighth transistors, the third and fourth resistors, the input of the error signal amplifier is connected to the output of the output voltage divider, the input of which is connected to the output and output bus of the error signal amplifier connected to the base of the first transistor and

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10,11,15 and 16.. The values U56 ,,,,, “Uetq-U gg- -Uje.a have a positive temperature-. tour drift. However, choosing the value of the multiplier (, y) / (K, you can achieve a zero temperature drift of the term in the expression in square brackets.

In normal mode, the operation of the stabilizer (transistor 2 is not saturated), the current of the second collector of transistor 19 is proportional to the output current of the stabilizer. When the saturation of the transistor. 2, the first collector of the transistor 19 becomes an equivalent emitter with respect to the second collector, which leads to a sharp increase in the current of the second collector and a complete shutdown of the stabilizer.

Thus, this DC voltage regulator has a higher thermal-protective circuit with respect to the Prototype and a low temperature drift of the output current overload protection circuit.

Claims (1)

Invention Formula Constant stabilizer ex. nor, containing an error signal amplifier, a circuit design combined with a reference voltage source, a control transistor, the first and second transistors, an output voltage divider, a task node thirty 35 the emitters of which are connected to the common bus, to the anode of the Zener diode and with the conclusions of the amplifier of the matching signal and the voltage divider of the output voltage 25, the collector of the first transistor is connected to the base of the second transistor and the first collector of the fifth transistor, the second collector of which is connected to the emitter second transistor and the base of the control transistor, the base of the second two-collector transistor is connected to the combined base and the first Collator of the fourth two-collector transistor and to the collector of the third transistor, the base otorrhea connected to the second collector of the fourth tr ican and the cathode of the zener diode, the emitters of the fourth and fifth transistors is connected to the dual-emitter regulating Transistor and with the input bus, the emitter of the third transistor is connected to the first of the first resistor, the base of the sixth resistor is connected to the first output of the second resistor, the emitter of the seventh transistor is connected to the first output of the third resistor, and the base is connected | to the first output of the fourth resistor, with the regulating transistor as well as the second, fourth, fifth and eighth transistors having pn-type conductivity, and the third, sixth and seventh transistors have conductivity, pnp- type, which differs from the fact that, in order to increase reliability by reducing the temperature drift of the current, the output overload protection is triggered 40 45 50 55 0 five the emitters of which are connected to the common bus, to the anode of the Zener diode and to the common terminals of the error amplifier and voltage divider of the output voltage 5, the collector of the first transistor is connected to the base of the second transistor and the first collector of the fifth transistor, the second collector of which is connected to the emitter of the second transistor and the base of the regulating transistor, the base of the second dual-collector transistor is connected to the combined base and the first collector of the fourth two-collector transistor and to the collector of the third transistor the base, the base of which is connected to the second collector of the fourth transistor and to the cathode of the Zener diode, the emitters of the fourth and fifth dual collector transistors are connected to the emitter of the regulating transistor and with the input bus, the emitter of the third transistor is connected to the first output of the first resistor, the base of the junction transistor is connected to the first output of the second resistor, the emitter of the seventh transistor is connected to the first output of the third resistor, and the base is connected | to the first output of the fourth resistor, while the regulating transistor, as well as the second, fourth, fifth and eighth transistors have a pnp-type conductivity, and the third, sixth and seventh transistors have a conductivity, pnp-type different from the fact that, in order to increase reliability by reducing the temperature drift of the current response of the output overload protection 0 five five current and increase the steepness of the thermal protection actuation, a ninth two-collector pnp-type transistor is introduced into it, the first collector of which is connected to the output bus, - with the base of the regulating transistor, the emitter - with the input bus, the second collector with the collector of the eighth transistor and with the emitter of the seventh transistor, the second output of the third  18 o Compiled by “Esin Editor S, Baker Tehred A. Kravchuk A resistor connected to a common bus,. The base of the sixth transistor is connected to the collector of the seventh transistor, the second terminal of the second resistor is connected to the base of the seventh transistor, the base of the eighth transistor is connected to the junction point of the second terminals of the first and fourth resistors, and the emitter is connected to the emitter of the third transistor. Proofreader L. Pilipenko