SU574785A1 - Timer relay - Google Patents

Description

ter-base of transistor 6, diode 9, RC driving circuit time 4, switch contacts 1, 2, negative power supply terminal 5. The charge current of the capacitor is the input current of transistor 6 and opens it, which triggers the output transistor stage 7 and switching on the executive relay 8. As the capacitor charges, the input current of the transistor 6 decreases, which leads to its closing and, accordingly, to the operation of the transistors of the element 7 and the switching off of the relay 8. Thus, when the sub-contact 1 is closed with a fixed contact 2 spolnitelnoe relay 8 vklyuchits on time as determined by the parameters defining the RC-time circuit 4.

When a moving contact 1 is closed with contact 3 not connected, the capacitor time of the driving RC circuit 4 will be discharged across the circuit: a capacitor capacitor plate and a resistor of the driving RC circuit 4, diode 10, the emitter-base of the transistor 6, the contacts 1, 3 of the switch , the negative capacitor plate of the time of the driving RC circuit 4. The discharge current of the capacitor is the input current for transistor 6, as a result of which the executive relay 8 turns on for the time of flow of the discharge current that is determined by the parameters of the driving RC circuit 4.

The capacitor charge and discharge circuits of the time of the driving RC circuit 4 are identical, therefore, when the contact 1 is connected in series with contacts 2 and 3, the execution relay 8 will turn on for the same time, the value of which is determined by the parameters of the driving RC time 4.

The advantage of the proposed time relay is the lack of time required to prepare the relay for switching on, since the initial state of the time relay is equally both the discharged and the charged position of the capacitor, the time of the driving RC circuit.

The proposed time relay can be used in various automation devices, for example, to control a pulsed solenoid valve, which is turned on by connecting a voltage pulse of a predetermined duration to it, and switching off by connecting a reverse voltage pulse of a predetermined value and such duration.

F o r iM invented

Time relay containing time setting

RC circuit connected between a moving contact of a switch for two positions, one fixed contact of which is connected to the input of the threshold transistor element and the other to the negative terminal,

and a diode connected to the same input of the threshold transistor element, directly connected to the output transistor stage, in whose collector circuit an actuating relay is installed, and

The emitters of these transistors are connected to a positive terminal, characterized in that, in order to reduce the preparation time of the relay for operation, an additional diode is inserted in the forward direction relative to the discharge current of the capacitor, the time of the driving RC circuit between the cathode of the said a diode and an emitter of the transistor of said threshold element.

Sources of information taken into account in the examination

I. USSR author's certificate L418913, cl. P 01 H 47/18,: 1974.

2. USSR author's certificate No. 389562, cl. H 01 H 47/18, 1973.

3. USSR author's certificate oV 470005, cl. П 01Н 47/18, 1974.

13-b