SU1413719A1 - Automatic switch - Google Patents

Abstract

The invention relates to a pulse technique and serves to extend the functionality, increase reliability, and the CCT of the device. The switch contains transistors (T) 1 and 2 of the first conductivity type, T 3 and 4 of the second conductivity type, threshold element 5 (Zener diode) and a resistor 6. Introduction T 10 of the second conductivity type, resistors 11 ... 14 and diode 15 ensures the order of supply supply voltage to the load. In addition, the reliability of the devices is increased by eliminating the supply of negative voltage to the output bus 8 in the absence of the necessary level of positive voltage on the output bus 17. 1 Il.

Description

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The invention relates to a pulse technique and can be used in monitoring devices, power supplies for automatic amplifiers of microwave amplifiers.

The purpose of the invention is to expand the functionality, increase reliability and efficiency,

The drawing shows the circuit diagram of the circuit breaker.

The circuit breaker contains the first and second transistors 1.2 of the first conductivity type, the third and fourth transistors 3.4 of the second conductivity type, the threshold element (Zener diode) 5, the cathode of which is connected to the base of the first transistor 1, the collector of which is connected to the first output of the first resistor 6 and an emitter of the second transistor 2, the base of which is connected to the collector of the fourth transistor 4, the collector to the base of the third transistor 3, the emitter of which is connected to the first input BUS 7, the collector to the first output bus 8 , the second input bus 9 is connected to the emitter of the first transistor 1, the fifth transistor 10 of the second conductivity type, the second, third, fourth, fifth resistors 11, 12, 13, 14, respectively, diode 15, the emitters of the fourth 4 and fifth 10 transistors are connected to common bus 16 and with the first output of the second resistor I 1, the second output of which is connected through the third resistor 12 to the anode of the threshold element 5 and to the collector of the fifth transistor 10, the base of which is connected to the second output of the first resistor 6, the base of the fourth transistor 4 is connected through a quarter re the transmitter 13 with the second input bus 9 and the second output bus 17, as well as with the anode of the diode 15, the cathode of which is connected via the fifth resistor 14 to the first output bus 8, the first and second loads R and R Hj are connected respectively to the first and second output bus.

The circuit breaker operates as follows.

In the initial state, when the second input bus 9 does not have a positive voltage or its level is less than the sum of the voltage of the breakdown of the threshold element 5 and the direct voltage at the base-emitter junction

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the first transistor, the first and fifth transistors 1, 10 are closed and, therefore, the second and third transistors 2 and 3 are closed. At the same time, there is no voltage on the first output bus 8.

When a positive voltage is applied to the second input bus 9, which exceeds the level of the onset of conduction of the first transistor 1 and the threshold element 5 serially connected by the base-emitter junction, the first transistor 1 opens and opens the fifth transistor 10 that shunts the second resistor 11 included in The base circuit of the first transistor 1. As a result, the first and fifth transistors 1.10 are switched to saturation mode. The presence of voltage on the second bus 9 creates the opening base current of the fourth transistor 4. With the appearance of the collector current of the first and fourth transistors 1.4, the second transistor 2 opens, which leads to unlocking the third transistor 3. In the presence of a negative voltage on the first input bus is the collector current of the third transistor 3 flowing through the first load. To On the first output bus 8, a voltage is set, the level of which is determined by a divider consisting of fourth and fifth resistors 13.14 and diode 15. The divider is connected between output buses 8.17. The output voltage level is maintained by a stabilizer consisting of second, third, and fourth transistors 2,3,4.

By reducing the positive voltage on the second input bus 9, the same threshold voltage. Detecting the open state of the first transistor 1, an avalanche-like process of locking the first and fifth transistors 1.10 occurs, the emitter current of the second transistor 2 stops, the stabilizer supply circuit is broken, the third transistor 3 closes. As a result, the negative voltage on the first output bus 8 decreases abruptly to zero. The circuit breaker returns to its original state.

Thus, the circuit breaker ensures the sequence of the supply voltage to the first and second load, has a high

reliability, excluding the supply of negative voltage to the first output bus 8 in the absence of the necessary level of positive voltage on the second output bus 17.

In the initial state, the currents consumed by the circuit breaker are determined by the leakage currents of the closed transistors, which ensures high efficiency.

Claims (1)

Invention Formula A circuit breaker containing the first and second transistors of the first conductivity type, the third and fourth transistors of the second conductivity type, the threshold element, the first resistor, the first pin of which is connected to the collector of the first transistor, the collector of the second transistor is connected to the base of the third transistor, whose emitter is connected to the first input bus; the collector, with the first output bus, characterized in that, with the purpose of extending functionality, increasing reliability and efficiency, a second input bus bottom, five external transistor of the second conductivity type, second, third, fourth and five resistors, a diode, the base of the fifth transistor is connected to the second output of the first resistor, the emitter to the common bus and the first output of the second resistor, the collector to the second output of the second the resistor and through the third resistor and the threshold element, which are connected in series, with the base of the first transistor, the emitter of which is connected to the second input and second output buses, the collector - with the emitter of the second transistor, the base of which is connected to the collector ohm fourth transistor whose emitter is connected to the common bus, base - through a fourth resistor to the second input bus and to the anode of a diode, the cathode of which is connected through a fifth resistor to said first output bus.