A.C./D.C. Solenoid drive circuit

Details A.C./D.C. Solenoid drive circuit A.C./D.C. Solenoid drive circuit

1978-05-01

1980-04-08

Albritton, C. L.

Electric heating

Heating devices

Combined with diverse-type art device

219388, 361194, H05B 100

Patent

active

041974441

ABSTRACT:
A solenoid drive circuit to enhance the operation of an alternating current solenoid. The circuit supplies alternating current to the solenoid when its plunger is in an extended position and then switches to a direct current when the plunger is in its home position, thereby eliminating any buzzing due to plunger misalignment or other inherent characteristics of the solenoid or associated mechanism and drawing less power than if it was being held in its home position with alternating current voltage. The invention has wide applicability but is disclosed herein in association with the operation of a fail-safe device, particularly a device to prevent fires from starting in a radiant energy fixer of an electrostatic copying machine in the event of a sudden loss of power.

REFERENCES:
patent: 2410183 (1946-10-01), Ray
patent: 3746834 (1973-07-01), Purps

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