SU1410000A2 - D.c. voltage stabilizer - Google Patents

Abstract

The invention relates to electrical engineering, in particular to stabilized power sources. and can be used to power electronic equipment and in atomics. The goal is to increase the reliability of the stabilizer due to its protection against short circuits and overcurrent. When overloaded, the value of the output voltage of the amplifier 10 becomes greater than that at the collector of transistor 7. The negative voltage is applied to the junction - source 14, it opens. The current of the protection transistor 7 becomes equal to the current of the two-port 5. The first control transistor 1 is closed. 1 il.

Description

(L

14)

The invention relates to electrical engineering, in particular to stabilized power sources, can be used to power electronic equipment and in automation, and is additional to the author. St. No. 922691.

The purpose of the invention is to increase the reliability of the stabilizer by protecting it from short circuits.

The drawing shows a schematic diagram of a constant voltage regulator.

The stabilizer contains the first regulating transistor 1, whose collector is connected to the input, and the emitter to the output of the stabilizer, the output correction capacitor 2 and the output divider of the output voltage, connected to the output stabilizer and the common stabilizer bus.

Between the collector and the base of transistor 1 is included a current-stabilizing two-port 5. The base of transistor 1 is also connected to the interconnected first side of matching two-pole 6 and the collector of protection transistor 7, the emitter of which is directly, and the base is connected to a common bus through a parallel connected resistor 8. The output of the error signal amplifier 10 is connected to the base of the second control transistor 11, the collector of which is connected to the common bus of the stabilizer, and the emitter is connected to the second output terminal of the matching two-terminal 6 directly and to the output amplifier through the error signal connected | to the output of the output divider for example, the second - to the source 13 support

ten

j Q

five

0

five

0

protection turns out to be closed. At the output of the error signal amplifier 10, a control signal is generated, at which transistor 1 opens and rapidly charges the output correction capacitor 2 to the nominal output voltage of the stabilizer. The voltage at the output of the amplifier 10 of the error signal an decreases in magnitude and the stabilizer switches to the stabilization mode of the output voltage. In this case, the capacitor 9 does not have time to charge the current KOMj flowing through the switch 14 from the output of the amplifier 10 to the threshold for opening the protection transistor 7, and therefore it does not affect the start of the stabilizer.

In the steady state to the transition gate - the source of the key 14 is applied, the voltage V is equal to the value of ip + Ug, (T)

- magnitude of the voltage drop on the two-port 6;

-the value of the voltage drop at the transition base-emitter of the transistor 11 ..

Analysis of expression (1) shows that a positive voltage is applied to the gate-to-junction transition. Therefore, the key 14 on the field-effect transistor with the p-channel is closed and does not affect the operation of the stabilizer.

In the event of a short circuit or juice overload at the output of the stabilizer, the voltage at the output of the stabilizer decreases in comparison with the nominal value of the output voltage. In this case, at the output of the error signal amplifier 10, the voltage value becomes greater than at the collector

where and

se

and

5E

jro tension The first and second terminals. With transistor 7 protection, connected

: from Yuch 14 on the field, for example, p-ka-1} 1, the transistor is connected respectively to the bases of the second regulating transistor 11 and the protection transistor, to the collector of which there is a switch 1 on g the salt transistor.

The constant-current stabilizer operates as follows. I At the time of supplying voltage to the inputs of the stabilizer, capacitors 2 and 9 are discharged. With these y | words, the output voltage of the stabilizer is equal to zero, and the transistor 7

50

55

with the base of the first regulating transistor 1. A negative voltage is applied to the junction of the gate — the source of the key 14, and it switches to the open state. In this case, the collector current of the protection transistor 7 becomes equal in magnitude to the current of the two poles 5. The first control transistor closes. After eliminating short circuits in the load, in order to bring the stabilizer in the stabilization mode of the output voltage, it is necessary to temporarily disconnect it from the power source.

0

five

with the base of the first control transistor 1. A negative voltage is applied to the gate-to-junction transition of the key 14, and it goes into the open state. In this case, the collector current of the protection transistor 7 becomes equal in magnitude to the current of the two-port 5. The first control transistor is closed. After eliminating short circuits in the load, to bring the stabilizer into the stabilization mode of the output voltage, it is necessary to disconnect it from the power source for a short time.

3-14100004

Claims (1)

The claims of the invention are connected, respectively, with the BazaSt, an abilizer of a constant control voltage of the second control transistor, or according to the ed. St. No. 92269, about tl and - and the protection transistor, and the third one is due to the fact that, with the purpose of supplying the base of the first regulating increase in reliability due to the protection of the transistor and the collector of the transistor against short circuits protection, the emitter of which is directly inserted a resistor, a capacitor, and the base is parallel through the protection resistor and the key on the field transistor and resistor and capacitor, the first and second terminals of which-JQ are connected to the common bus.