SU413547A1 - - Google Patents

Description

one

The invention relates to radio engineering and can be used in computer-to-mini-devices.

A time relay is known that contains the time of the master C-circuit, the output of which is connected to the control electrode of the thyristor connected in parallel with the / C-circuit and the winding of the electromagnetic relay.

This relay has a narrow range of time delay and low reliability.

The purpose of the invention is to extend the time limits and increase the reliability of the time relay.

To do this, in the proposed time relay, a valve element is inserted between the control electrode of the thyristor and the output of the C-circuit, which is connected in reverse polarity for the charge current of the capacitor.

As a valve element, a series-connected semiconductor diode and a base-emitter junction of a key transistor, shunted by a semiconductor diode in reverse polarity, are used.

The drawing shows the principal circuit diagram of the proposed time relay.

The time relay contains the time set by the QC-i.ep, consisting of a variable resistor 1 and a capacitor 2. Parallel to this circuit is connected a thyristor 3, a bypass winding

electromagnetic relay 4, in series with the limiting resistor 5. Between the pickup electrode of the thyristor 3 and the output, the valve element consisting of a series-connected i-semiconductor diode 6 and a base-emitter junction of the transistor 7 shunted by a semiconductor bottom 8 in reverse polarity is connected .

The relay works as follows.

After the key 9 is closed, the relay 4 is triggered, and the capacitor 2 begins to charge through the resistor 1. The circuit elements are chosen so that until the thyristor 3 is turned on, the potential of the cathode of the diode 6 is greater than the potential of its anode, determined by the voltage across the capacitor 2. At the same time, The voltage applied to the emitter-base portion of the transistor 7 is reduced to the permissible value

diodes 6 and 8.

The diode 6 and the transistor 7 are locked, and the charge of the capacitor 2 through the cathode-control electrode section of the thyristor 3 is eliminated. After a predetermined time the voltage on the capacitor

2 increases, diode 6 and transistor 7 open. The emitter current of the transistor 7 flows through the control electrode of the thyristor 3, the thyristor 3 turns on and bypasses the winding of the relay 4, which switches to the initial state. After

By unlocking the switch 9, the emitter potential of the transistor 7 becomes zero, the capacitor 2 is discharged through the base station - impedance transistor 7, diode 6, the control electrode - thyristor cathode 3 and resistor 5. After that, the relay is ready for the next cycle.

The near-transistor 7 in the circuit makes it possible to significantly increase the sonrot of resistor 1 and thereby extend the time limits (up to tens and hundreds of seconds).

Present Invention

Claims (2)

1. A time relay containing the time specifying the KS circuit, the output of which is connected to the control electrode of the thyristor butt-connected on the chute / C-circuit and the winding of the electromagnetic relay, characterized in that in order to extend the exposure time limits and increase the reliability of the device, between the control electrode of the thyristor and the output of the C-circuit, a valve element is inserted, which is included in the reverse field for the charge current of the capacitor RC-cenn. 2. A time relay according to claim 1, characterized in that a series-connected semiconductor diode and a base-emitter junction of the transistor, driven by a semiconductor diode in reverse polarity, are used as the mentioned valve element.