SU877735A1 - Device for controlling on-off transistorized switch - Google Patents

Description

(54J DEVICE FOR MANAGING A TWO-TURN TRANSISTOR KEY

one

The invention relates to electrical engineering, in particular, devices for controlling keys from zero-gap signal sources.

A device containing is known. a control transformer, a control transistor connected through a diode to the output winding of the transformer and a capacitor connected between the base of the power transistor and the emitter of the control transistor. When the control transistor is unlocked, the precharged capacitor discharges through the control transistor and the emitter — the base circuit. power transistor, causing accelerated resorption of minority carriers in its base ul.

The disadvantage of this device is that the discharge current of the capacitor is limited by the control transistor, which reduces its efficiency,

. The closest to the present invention is a device for controlling a push-pull transistor switch, which contains a control transformer, the output winding of which is used as a terminal for connecting to the bases of the transistors of the specified switch.

and the middle terminal is to one of the capacitor plates, and the second capacitor plate serves to connect transistors to the emitters and to one of the limiting resistor 2.

A disadvantage of the known device is reduced efficiency, because the capacitor during the pause

10 is discharged through the limiting resistor.

The purpose of the invention is to increase the efficiency of the device.

15 To achieve this goal, the device is equipped with a transistor, two resistors and two J5 diodes, the diodes being switched on sequentially and oppositely between the outermost leads.

20 output windings of the control transformer, the collector of the transistor is connected to the second output of the limiting resistor, its emitter to the middle output of the transformer, the base through the first resistor to the diode connection point, the second resistor is connected between the base and the emitter of the transistor ..

The drawing is a diagram of the device

30 properties.

Claims (1)

Claim D A device for controlling a push-pull transistor switch, comprising a control transformer, the output winding of which has 5 leads to connect to the transistor bases of the specified switch, and the middle terminal to one of the capacitor plates, and the second capacitor plate serves to connect transistors to the emitters and one of the findings of the limiting resistor, characterized in that, in order to increase efficiency _? it is equipped with a transistor, two _resistors and two diodes, the diodes being connected in series and counterclockwise between the extreme terminals of the output winding of the control transformer, the collector of the transistor is connected to the second terminal of the limiting resistor, its emitter to the middle terminal of the transformer, the base through the first resistor to the point connection of diodes, a second resistor is connected between the emitter and the base of the transistor.