SU741469A1 - Semiconductor relay - Google Patents

Description

(54) SEMICONDUCTOR RELAY

The invention relates to a pulse technique and can be used in various emergency control devices and electronic protection. Known relays made on transistors with a collector. In Sew 1. The disadvantage of these devices is that they are designed only for potential input signal. Also known are semiconductor relays containing a single vibrator on transistors, and an output transistor stage 2. A disadvantage of this device is a malfunction from an input pulse signal of an arbitrary shape. In order to expand the functional capabilities, a semiconductor relay containing a one-shot, made on transistors, a capacitor and a discharge circuit, as well as an output stage on the transistor, the base of which through a resistor is connected to the base of the first transistor of the one-shot, is introduced by a BSG generator on transistors, diodes and a resistive divider, with the collector of the second transistor of the single vibrator being connected through a diode to the base of the first transistor of the single vibrator and through another diode and a resistive divider with the base of the first and collector m of the second transistor KS-generator, while the collector of the output stage transistor is connected to the first output bus and through the KS-chain to the sMiTter of the second transistor of the KS-generator, the base of which is connected to the collector of the first transistor of the RC generator and the second output hyine. The drawing shows a circuit diagram of the device. It consists of a one-shot, made on transistors 1 and 2, connected according to a circuit with a direct connection, and a capacitor 3, diodes 4 and 5, resistors 6 - 8, an amplifier on transistor 9, a KC-generator on transistors 10 and 11, resistor 12 and a capacitor 13, a resistive voltage divider, made on the resistors 14 and 15, and the spreading diodes 16 and 17. The potential output signal is taken from the bus 18, and the pulse signal is taken from

bus 19. The device is powered from sources 20 and 21. Resistors 22 and 23 are used to provide the active mode of transistor 1

The device works as follows.

In the initial state, all transistors of the semiconductor relay are closed (with the exception of the transistor 11, which is brought into active mode), the condenser 3 is discharged, and there is no voltage on both output buses 18 and 19.

When the input signal (transistor 2 base) arrives at the input to unlock transistor 2, transistors 1 and 9 open, a potential appears at the potential output of bus 18 of the semiconductor relay, and capacitor 3 starts charging, regardless of whether input signal due to positive feedback between transistors 1 and 2, if by the end of the charge of capacitor 3 the input signal is less than the return voltage of the single-oscillator, transistors 1 and 2 will regeneratively close and the transistor 9 will continue remain open due to the discharge currents of the capacitor 3. If the parameters of the discharge circuit are selected so that at the minimum repetition frequency of the input signal of the semiconductor relay, transistor 9 is held open, then a potential signal is obtained without a gap charge capacitor 3 at the next input pulse. When the amplitude of the input signal drops below the trigger threshold of the relay, the potential output signal disappears when diode 4 is opened, as capacitor 3 tends to recharge.

The formation of pulse signals is as follows

At the moment the one-shot triggers, the charge of the capacitor 13 starts. The EC is the generator from the potential output voltage through the resistor 12, the emitter-base junction of the transistor 11 and the resistor 23.

The parameters of the divider (resistors 14 and 15) are chosen so that the voltages at the midpoint of the divider with the transistor 2 closed have an absolute value greater than or equal to the potential output voltage, and with the transistor 2 open, approximately 70% of the potential output voltage. Therefore, the SC-generator pulses are synchronized by the input pulses of the relay, and the CS-generator itself operates in the frequency divider mode. If the i-input of the relay gives a signal in which the transistor 2 is constantly open, then the VS-generator goes into self-oscillatory mode. Moreover, the generation stops instantly when the input signal decreases, the signal is below the threshold of the relay.

To increase the stability of the BC-generator at negative ambient temperatures. Transistor 11 is previously brought to active mode.

Thus, the semiconductor relay has two output signals, potential and pulse, can control the time element of overcurrent protection without inertia and is able to operate from an input pulse signal of arbitrary form. In addition, the relay can also work on a potential input signal.

Claims (2)

Invention Formula A semiconductor relay containing a one-shot transistor, a capacitor and a discharge circuit, as well as an output stage on a transistor, the base of which is connected via a resistor to the base of the first single-transistor transistor, in order to expand its functionality, RC transistor oscillator, diode and resistive divider, with the collector of the second one-shot transistor being connected via a diode to the base of the first one-shot transistor and through another diode and the resistive switch from the ba of the first transistor and the collector of the second transistor RC renerrator; the collector of the transistor of the output stage is connected to the first output bus and through the KS chain to the emitter of the second transistor of the KS generator, the base of which is connected to the collector of the first transistor of the KS generator and the second output by bus. Sources of information taken into account in the examination 1, Lipman P, A, Semiconductor relays. ML, Gosenergoizdat, 1963, with. 46, fig. nineteen. 2. USSR author's certificate number 235161, cl. H 03 K 17 / 60.08.01.68 (prototype). 20