SU997122A1 - Timer - Google Patents

Description

(54) TIME RELAY

The invention relates to radio electronics and can be used, but in automatic devices using pulse control, the intervals between which are less than the time limit.

A time relay is known to provide a possibility to control a group of pulses, the follow-up period of which is shorter than the proper response time of the relay, containing an RS flip-flop, a zero-organ and an amplifier for operating the electromagnetic relay 11.

The disadvantage of this time relay is its complexity.

It is also known a time relay, coherent holding an RC circuit, connected in series an input amplifier and an output amplifier with an electromagnetic relay as a load, a limiting resistor, a starting switch 2.

The disadvantage of this time relay is the impossibility of controlling it with a series of key locks, the time intervals between which are less than the proper time of the time relay operation.

The purpose of the invention is the ability to control the time relay

a series of key closures, the intervals between which are shorter than the proper time of operation of the timer.

The goal is achieved by the fact that in a known device, which contains a time setting CS circuit, the output of which is connected to the input, an input amplifier, an output amplifier with an electromagnetic relay winding as a load, a resistor in the emitter circuit of the input amplifier, limiting resistors, start switch , the time specifies the RC circuit with one output connected to the first power supply bus, and the other output through the limiting resistor to the first power supply bus and through another connected in series Yelnia razlalkayuschy resistor and a contact of the electromagnetic relay - a second power bus, and the starting key is connected in parallel with the resistor in the emitter circuit of the transistor amplifier input.

The drawing shows a circuit diagram of a time relay.

The time relay contains a circuit consisting of the time of the driving capacitor 1, the resistor 2, the resistor 3, the driving mode of the transistor, the resistor 4, the resistor 5, the disconnecting contacts 6, the input amplifier on the transistor 7 with 8 V resistors. emitter circuit and 9 in the collector circuit, an output amplifier on a transistor 10 with resistors 11 in the base circuit, and 12 in the emitter circuit and an electromagnetic relay 13, the winding of which is bypassed with a diode 14, a starting switch 15 connected in parallel to the resistor 8, and the executive contacts of the relay 16 .

The device works as follows.

In the initial state, the transistors and 10 are open, the electromagnetic relay 13 is under current, its contacts b are open, the capacitor 1 is charged to a voltage equal to the voltage drop on resistor 2. Closing key 15 causes the locking of the transistor XO and releasing the relay 13, The contacts of which, short-circuit, create a recharge circuit of the capacitor: power supply bus — contacts b — resistor 5 — capacitor 1 — resistor 2 — power supply bus. With contact closure b. transistor 7 is locked, and cat & this thereby keeps transistor 10 in the locked state after the key is unlocked until as long as the capacitor based on transistor 7 is recharged, there will be a blocking potential. With the opening of the transistor 7, the transistor 10 is opened and the relay 13 is triggered, the contacts of which are broken, and the polarity of the charge of the capacitor is reversed along the following circuit: the power supply line resistor 3 and the circuit parallel to it; consisting of a resistor 8 and an emitter junction - the base of transistor 7 is a capacitor 1 -; resistor 4 - power bus. If the contacts of the switch 15 are closed again before the transistors are opened, the capacitor partially partially recharges quickly and discharges and recovers its initial charge. Discharge circuit: capacitor lining 1 - low-resistance resistor 5 - contacts 6 - power bus - key 15 contacts - transition emitter - base of transistor 7 - capacitor plate. Initial charge recovery chain: tire

power - key - junction of the emitter base of the transistor 7 - capacitor 1 resistor 4 - power supply bus. In this case, the capacitor is charged until the voltage is equal to the voltage drop across the resistor 5 - and which is equal to the value of the voltage on the capacitor in the initial state. In general, these stresses may not be equal. After the key is opened, the recharging of the capacitor begins again, the time begins again, after which the electromagnetic relay 13 is triggered, switching the executive circuit to its contacts 16. When the contacts b are banged, capacitor 1 is charged before the voltage of the initial state. The diode 14 serves to eliminate the electromagnetic emission of the relay 13.

Claims (2)

1. USSR author's certificate  574855, cl. H 03 K 17/28, 11.05.76 2. USSR author's certificate No. 508818, cl. H 01 H 47/18, 10.01.73 prototype). 5P5 J M. ( + IS