SU1460715A1 - Current stabilizer - Google Patents

Abstract

The invention relates to electrical engineering and can be used to stabilize the current of any polarity. The purpose of the invention is to increase the stability of the output current by increasing the output resistance. The device contains a bias source, the first 1 and second 2 transistors of the same type of conductivity, the emitters of which are connected respectively to the terminals of the first 8 and second 9 resistors, and the collectors are connected to the output buses. The device differs from the well-known in that it introduces the third 3 and the fourth 4 transistors having the same conductivity as the first and second transistors, the fifth 5 and sixth 6 transistors having the opposite conductivity, the third resistor 10, while the emitters transistors 3, 4 are connected together and connected to the first pole of the bias source, their collectors respectively via resistors 8, 9 are connected to the emitters of transistors 5, 6, the emitters of the second ones are connected together and through the resistor 10 are connected to the second pole of the bias source, and collectors of transistors 5, 6 are connected respectively to the bases of transistors 1, 2. 1 or .. S (L

Description

720

C5 O

1460715

The invention relates to electrical engineering and can be used in power supplies for electronic equipment.

The aim of the invention is to increase the stability of the output current by increasing the output resistance of the stabilizer.

The drawing shows the principle electric circuit of the current stabilizer,.

The current stabilizer contains the first Ij second 2, third 3 and fourth 4 transistors of the first conductivity type, five and sixth six transistors of the second conductivity, reference voltage source 7, first 8, second 9 and third 10 resistors. The collectors of the transistors 1 and 2 of the sub-2o power circuit and, therefore, are connected respectively

to

15

10, the transition emitter - collector of the transistor 6, the transition base - collector of the transistor. 2, terminal 12.

When a positive voltage is applied to terminal 12, the stabilization current flows through the circuit: collector-emitter junction of transistor 2, resistor 9, collector emitter junction of transistor 4, source 7, resistor 10, junction emitter-collector of transistor 5, junction base-collector of transistor 1, terminal 11.

This ensures the stabilization of the current of any polarity.

When changing, for example, decreasing the load resistance, the voltage at terminals 11 and 12 increases. This leads to an increase of 30

to the output terminals 11 and 12, the emitters of transistors are connected respectively to the first outputs of resistors 8 and 9. The emitters of transistors 3 and 4 are connected 25 together and connected to the first field, source 7, and the collectors to the second terminals of resistors 8 and 9, respectively. The bases of transistors 3 and 4 are connected respectively to the bases of transistors 5 and 6, the emitters of which are connected together and through a resistor 10 are connected to the second pole of source 7, and the collectors of transistors 5 and 6 are connected respectively to the bases of transistors 1 and 2.

Current stabilizer work. T as follows.

Source 7 biases the emitter transitions of all transistors in the forward direction. The stabilization current is determined by the voltage of source 7, the value of resistor 10 and the voltage tjfa base emitter of transistors 3 and 5 or 4 and 6. Transistors 3 and 5, as well as transistors 4 and 2 are connected in a cascade manner. The cascades on transistors 3 and 4, respectively, and on the source 7 and the current-setting resistor 10 are made according to the current repeater circuit. Transistors 5 and 6 are used to bias transistors 1 and 2, respectively,

At. applying a positive voltage to terminal 11; the stabilization current flows through the collector-emitter junction circuit of transistor 1, resistor 8, junction collector-emitter transistor 3, source 7, resistor

35

40

45

50

55

to the voltage drop across the resistor 10. The bias voltage of the transistor 3 (or 4) decreases, the Fall increases, the voltage on the collector-emitter junction of the transistor (or 4), the voltage of the transistor 1 (or 2) decreases and the voltage drop across it increases. As a result, the output current is reduced to a previously set value with a given accuracy.

Thus, the current regulator as compared with the known one has several times higher stability of the output current due to an increase in the output differential resistance.

Claims (1)

Invention Formula A current stabilizer containing a voltage source, the first and second transistors of the same type of conductivity, the emitters of which are connected respectively to the first outputs of the first and second resistors and the collectors are connected to the output terminals, which differs from. In order to increase the stability of the output current by increasing the output impedance, the third and fourth transistors of such conductivity type as the first and second, five and sixth transistors of the opposite conductivity type, the third resistor, and the third and fourth tractors are introduced into it. - the resistors are combined and connected to the first pole of the reference source about power circuit and therefore o five 10, the transition emitter - collector of the transistor 6, the transition base - collector of the transistor. 2, terminal 12. When a positive voltage is applied to terminal 12, the stabilization current flows through the circuit: collector-emitter junction of transistor 2, resistor 9, collector-emitter junction of transistor 4, source 7, resistor 10, junction emitter-collector of transistor 5, base-to-collector junction terminal 11. This ensures the stabilization of the current of any polarity. When changing, for example, decreasing, the load resistance increases, the voltage at terminals 11 and 12. This leads to an increase in the to-2o power circuit and, therefore, thirty 25 35 40 45 50 five to the voltage drop across the resistor 10. The bias voltage of transistor 3 decreases (or 4), the Fall increases, the voltage across the collector-but-emitter junction of transistor 3 (or 4) decreases, the bias voltage across transistor 1 (or 2) and the voltage drop across it increases. As a result, the output current is reduced to a previously set value with a given accuracy. Thus, the current regulator as compared with the known one has several times higher stability of the output current due to an increase in the output differential resistance. Invention Formula A current stabilizer containing a voltage source, the first and second transistors of the same type of conductivity, the emitters of which are connected respectively to the first outputs of the first and second resistors, and the collectors are connected to the output terminals, which distinguishes c. In order to increase the stability of the output current by increasing the output resistance, the third and fourth transistors of the conductivity type of the first and second, five and sixth transistors of the opposite conductivity type, the third resistor, and the emitters of the third and fourth trays are introduced into it zistor connected and connected to the first pole of the source reference 1460715 voltages, collectors - to the second ones are combined, and through the third leads, respectively, the first and the resistor are connected to the second pole of the second resistors, the bases are connected. the source of the reference voltage, and accordingly with the bases of the first and collectors - to the bases of the sixth transistors, respectively, emitters of the co-first and second transistors.