SU1218423A1 - Time relay - Google Patents

Abstract

The invention relates to a pulse technique and is intended to include a power load of a relay, magnetic starters, electromagnets, and the like. with a time delay. The purpose of the invention is to increase the reliability of work by eliminating contact elements. Relay operation occurs in the following sequence. When power is applied to the terminals 3 and 4, the winding of the actuator (relay 2, diode bridge 1 and resistor (P) 5 flows through the charge current of capacitor 6). P 5 limits Jo to charge current to such an extent as to prevent false triggering of relay 2. Through P 14 and 7, the capacitor 8 is charged until the voltage is unlocked by the transistor 3, which opens, forming a current pulse of the capacitor 8. Under the action of this pulse, the triac 9 and is held open for two or three half cycles of the supply voltage .Simistor 9 the bridge 1 diagonal and across its other diagonal and the winding of the relay 2 under the action of network voltage alternating current flows causing relay 2. After unlocking the triac 9, a current flows through its controls to support the sy-, mistor 9 in the open state after the discharge of capacitors 8 and 6. To maintain the triac 9 in the open state in the intervals between pulses of a pulsing sinusoidal current, a capacitor 10 serves. The relay is disconnected by relieving the voltage from terminals 3 and 4. 1 Il, i (L 1C 00 4; 1C with

Description

The invention relates to a pulse technique and is intended to turn on a power load (relays, magnetic starters, electromagnets with a time delay.

The object of the invention is to increase the reliability of operation by eliminating contact elements,

The drawing shows a circuit diagram of the device.

The time relay contains a diode MO with 1 diagonal AC of which through an actuating element (load} 2 is connected to elements 3 and 4 of the supply mains, the diagonal of the direct current of bridge 1 is connected to the first serial circuit from the resistor 5 and capacitor 6. Parallel to the capacitor 6 A second series circuit is connected from resistor 7 and capacitor 8. The simulator 9 is connected by an anode to the positive terminal of bridge 1 and connected by a cathode to the negative terminal of bridge I through a capacitor 10, shunted by a zener diode 11. Triac input 9 v. n in series discharge capacitor 8 through the threshold voltage of element odnoperehod- ny transistor) 12.

Diode 13 is connected in series with resistor 14 to the discharge circuit of capacitor 6 through triac 9.

Turnip time works as follows.

When mains voltage is applied to terminals 3 and 4 through the winding of the actuator (relay) 2, diode bridge 1 and resistor 5, the charge current of the capacitor 6 flows. The resistor limits the charging current to such a value that EXECUTES By using resistors J4 and 7, the capacitor 8 is charged by the voltage of the capacitor 6. As soon as the capacitor 8 is charged before the voltage of the unlocking of the transistor 3, the latter opens, forming a current pulse of the capacitor 8. Under the influence of this pulse Triac 9 is kept open for 2-3 half-periods of the mains supply due to the Tofta discharge of the capacitor 6 through the resistive order 1134/58.

Branch ShSh Patent, Uzhgorod, st. Project, 4

torus 14 and diode 8 through the anode gap - the cathode of the triac 9. Triac 9 closes the diagonal of bridge 1 and through its other diagonal and relay 2 winding

under the influence of the network voltage protet. An alternating current is caused which causes the switching of relay 2. After unlocking the triac 9, under the action of a voltage drop across the zener diode 11, through the equalizing junction of the triac 9, a current flows that maintains the triac 9 in the open state after the discharge. . capacitors 8 and 6. To maintain the triac 9 in the open state

5 in the dips between pulses of a pulsing sinusoidal current serves a capacitor 10.

The time relay is switched off by removing the supply voltage

0 from terminals 3 and 4.

Claims (1)

Invention Formula The time relay containing the diode bridge, the diagonal of the alternating current through which the actuator is connected to the terminals of the supply mains, the first serial RC is the circuit connected to the diagonal of the direct current of the diode bridge, the second sequential RC is the circuit, the thyristor, the anode of which is connected to the positive one the output of the diode bridge, and its control electrode is connected through a series-connected capacitor of the second RC sequence to a circuit and a voltage threshold element connected to the negative terminal of the diode bridge, as well as a condenser Ator, diode, first and second resistors, so on, so that, in order to increase the reliability of the pa6oTbijB of it, a zener diode connected parallel to the capacitor and connected to the cathode of the thyristor, J. was introduced. which is made symmetrical, and the anode — to the negative terminal of the diode bridge, which is connected to the control electrode of the thyristor through the first resistor, and the diode is connected parallel to the resistor of the first series through the second resistor. RC circuit in the discharge direction of the capacitor, this circuit, and in the second sequential RC circuit, the second terminal of the resistor is connected to 0 five the diode anode. Circulation 644 Subscription