SU480347A1 - Transistor switch - Google Patents

Description

(54) TRANSISTOR KEY

This invention relates to automation and telemechanics.

Known transistor keys, soder. a switching transistor to which a TIC chain is connected, and

an auxiliary transistor, the output of which is connected to one of the terminals of the capacitor of the RC-chain and to the input of the switching transistor.

The purpose of the invention is to increase the efficiency. and an improvement in the switching-off force is achieved by the fact that, in the proposed switch, one of the terminals of the RC-capacitor is connected via a diode to the input of the auxiliary transistor.

In addition, when the push-pull version of the device contains an additional switching transistor, the output of which is connected to one of the terminals of the capacitor of the Q-chain and to the input of the switching transistor.

Figure 1 shows a diagram of a single-ended transistor switch when connecting the K-chain with the base a. and when connecting this chain with the emitter d commutative

a transistor; in fig. 2 is a circuit solution for a push-pull transistor key.

The transistor switch contains the switching transistors 1, the limiting resistor 2 and the forcing capacitor 3 in the control circuit of transistor 1, as well as an auxiliary transistor 4 connected between the free terminals of the capacitor and transistor 1. In the push-pull circuit (figure 2) there is one auxiliary transistor 4 The comm switch color of the Transistor 1, connected by a collector to the free input electrodes (in this case, to the bases) of the transistors 1 through separation diodes 5 and 6.

A diode 7 is connected to an output of a capacitor that is not connected to a transistor 1. An input transistor 4 is connected in parallel to a diode.

The principle of action of the transistor switch (Figures 1 and 2) is as follows.

When a positive signal is applied to the base of the switching transistor 1, the latter is unlocked. At the same time, capacitor 3 is recharged through diode 7.

"V -..-., 4t

-480347 mighty transistor 4 is locked. As long as the input signal is not attenuated, transistor 4 continues to be held in locked state. When the signal at the input of transistor 1 (the front of the control pulse is weakened), the capacitor discharges through the input of the auxiliary transistor 4, which opens and connects the capacitor to the input of transistor 1. The charge of the capacitor compensates the charge opposite Due to this, the force-dissipation process of minority carriers in the base of transistor 1 and the time of its disconnection. In the off-transistor 1 (fkg.1) state, the capacitor continues to discharge to the input of transistor 4, and thanks to this, a blocking potential is applied to the base of transistor 1 in the push-pull switch circuit (figure 2) in that time interval when one of the transistors is open .1, the other is held in a cut-off state by applying a blocking potential to the base with a capacitor through a resistor 8 or 9.

Both in single-ended and two-stroke gs transistors.

Claims (2)

, The -.V version of the chopper is controlled from a signal source with a high internal resistance. Claim 1. Transistor switch containing a switching transistor, the input of which is connected to the JC-chain, and an auxiliary transistor, the input of which is connected to one of the terminals of the RL-chain capacitor and to the input of the switching transistor, characterized in that n, d and improvement. forcing off, one of the conclusions of the RC capacitor - the circuit is connected via a diode to the input of the auxiliary transistor. 2.Klyuchic.1, in spite of the fact that it introduced an additional commutation of the transistor, the output of which is connected to one of the terminals of the capacitor of the chain and to the input of the commutator L //./ at.2