SU1638743A1 - Device for connecting electromagnetic relay - Google Patents

Abstract

The invention relates to electrical engineering and may find application in switching circuits of electromagnetic relays, contactors. The purpose of the invention is to increase reliability by simplifying. When the power is turned on, the initial magnetization current flows through the winding from the additional power source formed by the zener diode 7. When the switch 4 is closed, the starting current flows through the relay winding. After charging the capacitor 5, a holding current flows through the relay coil. 1 il.

Description

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The invention relates to electrical engineering and may find application in switching circuits of electromagnetic relays, contactors.

The purpose of the invention is to increase reliability by simplifying.

The drawing shows a circuit diagram of the proposed device.

The device contains an electromagnetic relay 1, busbars 2 and 3 of the power supply, a control key 4, a capacitor 5, a resistor 6, a zener diode, a diode 8, a disconnecting pin 9 of relay 1, a resistor 10. The winding of the relay 1 is connected to the buses 3 and 2 through a series-connected capacitor , shunted by a resistor 10. The Zener diode 7, the resistor 6 and the disconnecting contact 9 of the relay are connected in series and connected to the buses 2 and 3 of the power supply. The connection point of the Zener diode 7 with the resistor 6 through the diode 8 is connected to the connection point of the winding of the relay 1 with the capacitor 5 through the diode 8.

The device works as follows.

When the device is disconnected from the power source, the voltage on its elements is missing, the capacitor 5 is discharged. When voltage is applied to pins 2 and 3, the winding of the relay 1 is energized, the voltage across it will be equal to the stabilization voltage of the zener diode. An initial bias current flows through the relay 1 winding. The parameters of the Zener diode 7 are selected so that the magnitude of the initial bias current of the relay is less than the relay tripping current.

At the moment of closing the control switch 4, the voltage of the power source is applied to the winding of the relay 1 through the capacitor 5, the relay 1 is activated. In this case, the capacitor 5 is selected so that its charge time to a value when the current through the winding of the relay 1 becomes equal to the return current of the relay is longer than the response time of the relay. When switching the control key 4, the current in the winding of the relay 1 increases to the value of the relay operation current not from zero, but from a certain initial value, which contributes to reducing the transient time and accelerating the relay operation. After the relay 1 trips, its normally open contact 9 opens, thanks to

which prevents current flow through resistor 6;

When returning key 4 to the initial state shown in the drawing, capacitor 5 is discharged through resistor 10, and winding

0 relay 1 again receives power through resistor 6.

Thanks to the specified circuit solution, the device is simplified - one diode is eliminated and the number of 5 in contact elements is reduced compared to the prototype.

Claims (1)

Claims An apparatus for energizing an electromagnetic relay, comprising terminals for connecting a power source, terminals for connecting a winding of an electromagnetic relay, and terminals for connecting a disconnecting contact of said electromagnetic relay, a diode, a zener diode, two 5 resistors, a capacitor and a switch; the first lead for connecting the power supply is connected to the first lead for connecting the opening contact of the specified electromagnetic relay and to the fixed one 0 to the key contact, a second terminal for connecting the opening contact of the specified electromagnetic relay is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to the anode 5 of the diode and to the cathode of the Zener diode, the cathode of the diode is connected to the first capacitor plate, to the first terminal for connecting the coil of the electromagnetic relay and to the first terminal of the second resistor, the second plate 0, the capacitor is connected to the movable contact of the key, the anode of the Zener diode is connected to the second terminal for connecting the winding of the electromagnetic relay and the second terminal for connecting the power source, characterized in that. that, in order to increase reliability by simplifying, a key with a closing contact group was used as a key and the second output of the second resistor is connected to the second capacitor.