SU915066A1 - Dc current stabilizer - Google Patents

Description

The invention relates to electrical engineering and can be used as reference current sources in analog integrated circuits.

Known stabilizer DC containing regulating transistor, the emitter of which is connected to a common bus through a resistor, the collector is connected to the load, and the base is connected to the current resistor and to the collector of the transistor, the base of which is connected to the emitter of the regulating transistor, and the emitter is connected to a common bus [1 ].

A disadvantage of the known DC stabilizer is low stability when exposed to temperature, pressure, ionizing radiation.

The closest technical entity is a DC stabilizer, containing the first transistor, the emitter of which is connected via a power supply to the power bus, and

2

the collector and the base - with the base of the second transistor, the emitter of which is connected to the power bus [2].

Its disadvantage is low stability when exposed to temperature, ionizing radiation.

The purpose of the invention is to increase the coefficient of stabilization.

This goal is achieved by the fact that the DC regulator containing the first Transistor, the emitter of which is connected through a resistor to the power bus, and the collector and the base - with the base of the second transistor, the emitter of which is connected to the power bus, additionally introduced five transistors, and the collector of the first transistor connected to the emitter of the third transistor, the base of which is connected to the collectors of the second and fourth transistors, and the collector - with the bases of the fourth and fifth transistors and collector of the sixth transistor, uh Miter Thursday 915066 4

This transistor is connected to the emitter of the fifth, base of the sixth, base and collector of the seventh transistor, the emitters of the sixth and seventh transistor are connected to the common bus, and 5

the collector of the fifth transistor is connected to the output of the stabilizer.

The drawing shows a schematic diagram of a DC stabilizer. ten

The device contains a resistor 1, / included in the emitter circuit of the transistor 2, the base and collector of which are combined and connected to the base of the transistor 3 and the emitter of the transistor 4, 15

the base of transistor 4 is connected to the collectors of transistor 3 and transistor 5, and the collector of transistor 4 is connected to the bases of transistors 5 and

6 and the collector of transistor 7, the base 20 of transistor 7 is connected to the base and collector of transistor 8 and to the emitter of transistors 5 and 6, the emitters of transistors 7 and 8 are connected to a common bus, and the emitter of transistor 3 25

and a resistor connected to the power bus.

The DC stabilizer operates as follows.

'When the supply voltage is applied to the stabilizer in the collector circuit of transistor 6, the required value of the current that is supplied to the load is set. ,

With an increase of a rank ₃₅ pri- current in the collector circuit of the transistor 6 increases the potential at the collector of transistor 8, which leads to a partial closing of transistor 5 and to increase capacity at its collector. Increasing the potential on the collector of transistor 5 leads to a partial closing of transistor 4, resulting in a decrease in the potential on the collector of transistor _{<5 of} resistor 7, and to a partial closing of transistors 5 and 6, as a result of which the value of the current in the stabilizer load is restored.

Furthermore, by increasing the load current increases the base potential of the transistor 7, thereby partially opening the transistor 7 · As a result, the feedback action of the circuit current value of the load again tends to pervona- ⁵⁵ initial value. Thus, in the proposed constant-current stabilizer ^ a, the feedback acts

two circuits, which increases the stability of the output current.

The value of the output current is equal to

where the area of the emitter transitions of transistors 2,3, 4,6,7,8, respectively;

K - resistance

resistor 1

- temperature potential of expression 1

al

it turns out the condition of realizability of the device

5.Λ

^δ 8 ⁵ 4

The proposed DC stabilizer, compared with the best samples of stabilizers, allows to increase the stability of the specified current to the effects of external destabilizing conditions.

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Claims (1)

Claim A dc stabilizer containing the first transistor, the emitter of which is connected via a resistor to the power bus, and the collector and the base are connected to the base of the second transistor, the emitter of which is connected to the power bus, in order to increase the stabilization factor five transistors, and the collector of the first transistor is connected to the emitter of the third transistor, the base of which is connected to the collectors of the second and fourth transistors, and the collector - with the bases of the fourth and fifth transistors and collector gear th transistor, the emitter of the fourth transistor is connected to the emitter of the fifth, sixth with base and the base and collector of the seventh transistor, the emitters of the sixth and seventh tranzis5 tori connected to a common bus, and the collector of the fifth transistor is connected to the output of the stabilizer.