SU634455A1 - Transistorized switch - Google Patents

Description

one

The invention relates to automation and can be used in impulse controllers and direct current converters.

A transistor switch containing a transistor, a positive feedback transformer is known, the primary winding of which is connected in series with the collector-emitter junction of the transistor, the load and the power source, and the secondary winding is connected through the base emitter junction of the transistor.

The well-known key has great control power.

The purpose of the invention is to reduce the power control transistor switch.

To do this, the proposed transistor switch containing a transistor, a positive feedback transformer, the primary winding of which is connected in series with the collector-emitter junction of the transistor, the load and the power source, and the secondary winding through the diode connected to the base-emitter junction of the transistor, an additional transistor is inserted, resistive divider, capacitor, with the transition of the collector-emitter of the additional transistor connected between the output of the secondary winding of the transformer, positive feedback Zi and the base of the transistor, a resistive divider is connected between the power supply and the common bus, and its middle point is connected to the collector of the additional transistor and a capacitor, the second terminal of which is connected to the common bus.

The drawing shows a circuit diagram of a transistor switch.

The device contains a transistor 1, a positive feedback transformer 2, a transformer primary winding 3, a resistor 4, a power source 5, a transformer secondary winding, a diode 7, a control source 8, an additional transistor 9, a resistive divider 10, a capacitor 11 and a switch key 12 control source 13 -. middle point of resistive divider.

The transistor switch operates as follows.

In the initial state, when the control source 8 is disconnected, transistors 1 and 9 of the transistor switch are locked. Therefore, the capacitor 11 at the output of the resistyyuyu divider 10 is charged before the voltage of the power source 5 When the key 12 is inserted into the source 8 of control 8 and the control rectangular impulses appear at the input of the transistor 9, the initial charge of the capacitor 11 ensures that the transistor 11 is clearly turned off 1, the switching process does not depend on the depth of the positive feedback and does not require force, in this scheme the feedback signal serves only to keep the commutation of only transistor 1 in the set state. The switching power of the transistor, 1, is significantly reduced, because to turn off transistor 1, the positive reverse CBP signal is not required to be compensated: ZI with o6iotg-ag, After switching off the transistor SOSOB 1 and 9, the voltage on the capacitor 11 remains until the next cycle is turned on uranium iotor key. Foriuli, the invention of a transistor switch, is a transistor of a positive feedback 6,554 transformer containing a transistor, the primary winding of which is connected in series with the collector-emitter junction of the transistor, the load and the power source, and the secondary winding is connected through the diode to the base transistor emitter junction, characterized in that, in order to reduce the control power, an additional transistor, a resistive divider, a capacitor is inserted into it, and the additional transistor collector transistor is connected between you the secondary winding of the positive feedback transformer and the base of the transistor, a divider divider is connected between the power supply and the bus, and its midpoint is connected to the auxiliary transistor collector and the capacitor, the second output of which is connected to the common source, the sources of the transformer are connected to 3 expert examination: 1. PatentFRG 2459368, Q 05, -R, 24.D6.76.