SU1241384A2 - Transistor switch - Google Patents

Abstract

The invention relates to electrical engineering and can be used in power supply and automation systems for switching DC voltage. The purpose of the invention is to increase reliability by reducing the power dissipated on the main transistor when it is turned on. The transistor switch // contains the main transistor (OT) I and the auxiliary transistor (VT) 4. The control unit (CU) 2 generates polarized rectangular pulses. When the polarity is positive, the CU 2 charges the capacitor (k) 12 with the voltage of additional O (10). When the polarity changes, OT 1 opens through resistor 3, and transistor 13 opens simultaneously, charging the K 12 to control transition OT 1. , the base current sharply increases, the acceleration of OT 1 is forced, the introduction of TO 10, diode 8, K 12, BT 4 leads to a decrease in the power dissipation in the process, the switch on OT 1. The invention is complementary to the auth. No. 1061226. I Il. § (o go

Description

one

The invention relates to electrical engineering and can be used in power supply and automation systems for switching DC voltage.

The purpose of the invention is to increase reliability by reducing the power dissipation on the main transistor when it is turned on. . .

The drawing shows a diagram of a transistor switch.

The transistor switch contains the main transistor, the emitter-base transition of which is connected to the input of control unit 2 via a ballast resistor 3. Parallel to the emitter-base transition of transistor 1 are connected in series auxiliary transistor A and a blocking capacitor 5. The base of transistor 4 is connected to the connection point of the transistor - tori 6 and 7, connected via diode 8 to the output of control unit 2 and shunt by capacitor 9; Additional winding 10 is connected to the base of transistor 1 with an end, and The terminal diode 11, an anode connected to the output of an additional capacitor 12 and the collector of the additional transistor 13, the base-emitter junction of which through the additional resistor 14 is connected parallel to the ballast resistor 3.

The device works in the following way.,

The control unit generates a variety of rectangular pulses. With a positive polarity

Editor E. Kopcha Order 3608/51

Compiled by V. Moin

Tehred L.Oleynik Proofreader A. Obruchar

Circulation 631 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

5 0 5 o

five

384 2

the voltage at the ends of the transformer windings of the control unit 2 (not marked with a dot) is charged by the capacitor 12 from the voltage on the winding 10. When the polarity changes, transistor 1 is opened through the ballast resistor 3. Simultaneously, transistor 13 opens, which connects the charged capacitor 2 to The zmitter-base transition of transistor 1 causes a sharp increase in base current. This results in saturation of transistor 1, which leads to a decrease in power dissipation during the process of switching on this transistor.

Claims (1)

Invention Formula Transistor Key Auth.St. No. 1061226, characterized in that, in order to increase reliability by reducing the power, all the main transistors, when turned on, introduce additional winding on the transformer of the control unit, diode, capacitor, transistor and resistor, with one additional winding lead and one of the terminals of the input capacitor is connected to the base of the main transistor, and the other output of this winding is connected to the cathode of the input diode, the anode connected to the second output of the input capacitor and the collector of the input t anzistora, the base-emitter thereof through a resistor connected in parallel inputted .ballastnomu resistor.