SU1314321A1 - D.c.voltage stabilizer - Google Patents

Abstract

The invention relates to electrical engineering and can be used in power supply devices of automation systems. The goal is to increase the stabilization factor. Changes in the emitter currents of transistors 2, 6 are equal and out of phase, as a result of which the current through Zener diode 3 remains constant with changes in load current, since changes in the base currents of transistors are compensated for by selecting the values of resistors 7, 8. Constant current through the Zener diode leads to increase stabilization factor. 1 il. ate

Description

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The invention relates to electrical engineering and can be used in power supply systems, automation systems.

The aim of the invention is to increase the stabilization factor.

The drawing shows a circuit diagram of the proposed DC voltage stabilizer,

The stabilizer contains a regulating transistor 1, a feedback amplifier in transistor 2, differential in conductivity with regulating, reference Zener diode 3, output voltage divider: resistors 4 and 5, compensating transistor 6, of the same type in conductivity with transistor 2, current defining resistors 7 and 8, a current limiting resistor 9. The control transistor 1 is connected by an emitter to the input terminal and a collector to the output terminal J one of the terminals of the zener diode 3 is connected to the output terminal and the other. - through current limiting resistor 9 - to common bus

The circuit from the collector-emitter junction of the compensating transistor 6 and the first resistor 8 is connected in parallel to the Zener diode 3, the base of the compensating transistor 6 is connected to the collector through the first resistor 7, to the base of the regulating transistor 1, the average output voltage divider of resistors 4 and 5 is connected to the base transistor 2, the emitter of which is connected to the output of the Zener diode 3 and through a resistor 9 with a common bus.

The stabilizer works as follows.

When the load current or input voltage changes, the output voltage of the stabilizer changes accordingly. This change through the output voltage divider on resistors 4 and 5 and resistor 9 is fed to the input of transistor 2, which leads to an increase (decrease) in the collector current of transistor 2, and, accordingly, the base current of control transistor 1, which will lead to more fully erasing (locking) the transistor 1 and increasing (decreasing) the output voltage. The compensating transistor 6 is powered stabilized12

The voltage of the reference Zener diode 3 and the change in its emitter current will be determined only by the change in the emitter current of transistor 2, and these changes are proportional and out of phase. Excluding the base currents of the transistors 2 and 6, the changes in the emitter currents will be equal with equal resistors 8 and 9. The base

the currents are compensated by the selection of resistors 7 and 8. In this case, the current of the Zener diode is equal to the difference of the current through the resistor 9 and the emitter currents of the transistors 2 and 6.

Since the changes of the emitter currents of the indicated transistors of the currents during the operation are equal and antiphase, the current of the Zener diode 3 will not change.

Compensation for changes in the current of the Zener diode in the stabilizer is equally pronounced as the number of the differential resistance of the Zener diode is reduced to a value close to zero.

Taking into account that the input resistance of the transistor 2 and the differential resistance of the Zener diode of one .porka, the increase of the stabilization factor will be not less than 2 times compared with the prototype ..

Thus, thanks to the introduced means, it became possible to create voltage stabilizers with a higher stabilization factor.

while maintaining small dimensions and weight, since the increase in stability is achieved without the introduction of additional amplification stages in the feedback circuit and the use of capacitive corrective elements.

Claims (1)

Invention Formula A dc stabilizer containing a regulating transistor connected by an emitter to an input terminal and a collector to an output terminal, a feedback transistor that is different in conductivity with a regulating transistor, which has a zener diode, one of which is connected to output terminal, and the other to the feedback transistor emitter, and through a current limiting resistor to a common bus, an output voltage divider connected by an average output to the base of the feedback transistor, which is different from that in order to increase 313) 43214 stabilization factor, - in the feedback non-transistor and - through A compensating transistor was introduced, the first resistor with a regulating base of the same conductivity from the transistor transistor, the collector by the feedback switch, and two resistors to the output, and the emitter, and the compensation base through the second resistor to the emitter A transistor is connected to a feedback transistor collector.