Remanence switching device

Details Remanence switching device Remanence switching device

1996-09-24

1997-12-09

Young, Brian K.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361152, 361156, H01H 4718

Patent

active

056966610

ABSTRACT:
The present invention is directed to a device intended to turn on loads and keep them on for a pre-established period of time and includes a remanence relay which includes a coil L, a movable contact 1, a fixed, normally opened contact 2b and a fixed, normally closed contact 2a. When a remote push switch S is pushed to its ON position, a first current flows through the coil L in a first direction to cause the movable contact 1 to move from engagement with the contact 2b to engagement with the contact 2a. As a result, power is applied to a load 5. When the switch S is opened, a timing circuit, which includes a capacitor C1, a resistor R3, an electric disruptive device D5 and a diode D4, is initiated which charges the capacitor C1. When the voltage of the capacitor C1 reaches the threshold voltage of the disruptive device D5, a second current opposite in direction to the first current flows through the coil L to cause the movable contact to move to the contact 2b and disconnect the load 5. When the push switch S is in the ON position, a third circuit, which includes the capacitor C1, the diode D3 and a second capacitor shunt connected with a resistor R1, discharges the capacitor C1 to a predetermined low voltage, the predetermined low voltage of the capacitor C1 being determined by a shunt connected diode D1.

REFERENCES:
patent: 3564346 (1971-02-01), Atkins
patent: 3987346 (1976-10-01), Riordan

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