SU1390796A1 - Transistor gate - Google Patents

Abstract

The invention relates to a pulse technique and can be used in radio devices and automation systems. The transistor switch contains transistors 1, 2, diodes 3, 4, resistors 5–8, input 9 and output 10 buses, sources 11, 12, 14 power supplies and a common bus 13. The efficiency of the transistor switch is higher than that of the known ones due to reducing power losses in the power transistor control circuit. 1 il.

Description

The invention relates to a pulse technique and can be used in various radio engineering devices and automation systems.

The purpose of the invention is to increase the efficiency of a transistor switch by reducing power losses in the control circuit of a power transistor.

The drawing shows a diagram of a transistor switch.

The transistor switch contains the first 1 and second 2 transistors, the first 3 and second 4 diodes, four resistors 5-8, input 9 and output 10 bus, the base of the first transistor 1 connected to the first output of the first diode 3, the collector of the second transistor 2 and through the first resistor 5 to the first bus of the first power source 11, the second output of the first diode 3 is connected to the output bus 10 and em: a tter of the first transistor 1, the collector of which is connected to one bus of the second power source 12, the other bus of which. connected to the common bus 13, the front bus of the third power source 14 and the emitter of the second transistor 2, the base of which is connected to the first terminals of the second 6 and third 7 resistors, the first terminal of the second diode 4 is connected to the first terminal of the fourth resistor 8, the emitter of the first transistor 1 is connected to the second bus of the first power supply 11 and the second output of the second diode 4, the second output of the fourth resistor 8 is connected to the second bus of the third power supply 14, the first itoHa of which is connected to the second output of the second resistor 6, the second output q third resistor 7 is connected to the input bus 9.

The transistor switch works as follows.

In the absence of a signal on the input bus 9, the transistor 2 is closed. The presence of a bridge-resistor 6, a shunt emitter junction of transistor 2, prevents the opening of the next, the reverse current of the collector junction of transistor 2 through itself. In this case, the current in the circuit: source 14 - resistor 8 - diode 4 - diode 3 - transistor 2 - source 14 is missing and, therefore, no action of power source 14 on the difference

f)

0

five

base potentials - the emitter of transistor 1 does not produce.

Transistor 1 is open until it is open due to the base current flowing through the circuit: source 11 - resistor 5 - base-emitter transition of transistor 1 - source 11. The emitter of transistor 1, and therefore the output bus 10 of the device, has a signal that is less than positive potential of the source 12 by the magnitude of the voltage drop across the open transistor 1. The considered state corresponds to the formation of the output pulse of the device on the output bus 10 relative to the common bus 13.

With the arrival of the signal on the input bus 9 with respect to the common bus 13, transistor 2 is opened by the base current flowing through the limiting resistor 7 and the base-emitter junction of transistor 2, which leads to current in the circuit: source 14 - resistor 8 - diode 4 - diode 3 - transistor 2 - source 14, as a result of which transistor 1 is closed.

The efficiency of the proposed transistor key 0 is higher than that of the known ones, due to the reduction of power losses in the control circuit of the power transistor.

five

0

five

0

Claims (1)

Invention Formula A transistor switch, containing: first and second transistors, first and second diodes, four resistors, input and output buses, the base of the first transistor connected to the first output of the first diode, the collector of the second transistor and through the first resistor to the first bus of the first power source, the second the output of the first diode is connected to the output bus and the emitter of the first transistor, the collector of which is connected to one bus of the second power source, the other bus of which is connected to the common bus, the first bus of the third power source and emitte In the second transistor, the base of which is connected to the first terminals of the second and third resistors, the first terminal of the second diode is connected to the first terminal of the fourth resistor, characterized in that, in order to increase efficiency, the emitter of the first transistor is connected to the second bus of the first 1390796 34 The power supply and the second output of the first busbar are connected to the second diode, the second output to the fourth output of the second resistor, the second resistor is connected to the second swarm to the third resistor connected to the third power supply to the input busbar.