SU978347A1 - Semiconductor switch - Google Patents

Description

(5) semiconductor key

one

The invention relates to a pulse technique, in particular to devices for switching electrical energy, and can be used in computer automation or converter; technology for switching active, inductive or capacitive loads in direct current circuits.

A semiconductor switch is known that contains a power transistor, a first current transformer with output and input windings, a first control transistor, a first diode, power lines, and the base-emitter junction of the power transistor is bounded by the output winding of the current transformer 1.

The specified key has low efficiency due to power losses in the control circuits.

Also known is a semiconductor switch containing a power transistor, a first and a second current transformer with corresponding first inputs.

And the output windings, the first control, - the driving transistor, the first diode, the power buses, the base-emitter junction of the power transistor is shunted by the first output winding of the first current transformer, the first input winding of the second current transformer is connected in series with the collector-emitter junction of the known transistor, and the oasis and emitter of the first control transistor are connected to the input terminals C.

The disadvantage of the known key is low speed, since when the power transistor is turned off, the process of resorption of carriers is slower than with passive locking. In addition, the known key has low reliability due to overvoltage on the first output winding of the first current transformer, which can lead to the failure of the power transistor.

The purpose of the invention is to increase speed and reliability. .

The goal is achieved by the fact that in a semiconductor switch containing a power transistor, the first and second current transformers with the corresponding first input and output windings, the first control transistor, the first diode, the power bus, and the base-emitter of the power transistor is shunted by the first output winding of the first current transformer, in series with the collector-emitter junction of the transistor included the first input to the winding of the second current transformer, and the base and emitter of the first control transformer The transistor is connected to the input terminals, a second reverse-conduction control transistor is inserted with respect to the first control transistor, two diodes, two diode-resistor circuits, the first current transformer is equipped with a second input, start and demagnetizing windings and the second current transformer is equipped with a second output and demagnetizing windings, the base of the second control transistor is connected to the base, and to the emitter of the first coalition transistor and the first bus of the lithium source, the collector of the first The first control transistor is connected to the first output of the starting winding of the first current transformer, the second output of which is connected via the first diode to the second power supply bus, and through the first input winding of the first current transformer, the second diode and the first output winding of the second current transformer to the first the power supply bus and to one output, the second output winding of the second current transformer, the collector of the second control transistor through serially connected e a third diode and a second input winding of the first current transformer coupled to the other terminal

second output winding of the second TOKo

transformer, and through serially connected demagnetizing the winding of the first current transformer and the first diode-resistor chain and through serially connected demagnetizing the winding of the second current transformer and the second diode-resistor chain to the third bus power source.

The drawing shows the principal circuit diagram of a semiconductor key.

The device contains a power transistor 1, the base-emitter junction of which is shunted by the output winding 2 of the first current transformer 3. In series with the collector-emitter junction of this transistor, the first input winding k of the second current transformer $ is turned on

Terminals 6 and 7 are used to connect to the switched circuit. The first control transistor 8 is connected to the base terminals and emitter terminals to the input terminals 9 and 10. The base of the second control transistor 11 is connected to the base of the first control transistor 8, and they are. The emitters connected together are connected to the first power supply bus 12. First collector

the control transistor 8 is connected to the first output of the starting winding 13 of the first current transformer 3, the second output of which through the first diode 14 is connected to the second bus 15 of the power supply, and through the first input winding 16 of the first current transformer 3, the second diode 17 and the first The output winding 18 of the second current transformer 5 is connected to the first power supply bus 12. The collector of the second control transistor 11 through the third diode 19 connected in series, the second input

The first winding 20 of the first current transformer 5 is connected with the output of the first output winding 18 connected to the first power supply bus 12, and through serially connected demagnetizing winding 22 of the first current transformer 3 and the first diode-resistor circuit 23 is connected to the third power supply bus 2 . In addition, the collector of the second transistor 11 of the control is connected via a series-connected demagnetizing winding 25 of the second current transformer 5 and the second diode-resistor chain 26 to the third power supply bus 2k.

Claims (2)

1. Author's certificate No. 630752, cl. H 03 K 17/60, 1978. 2. The author's certificate No. 50336A. cl. H 03 K 17/60, 1976 (prototype).