Electronic gas valve power interruption switch

Details Electronic gas valve power interruption switch Electronic gas valve power interruption switch

1992-05-22

1994-02-15

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Terminal voltage or counter-electromotive force of...

361 33, 361170, 110193, 236DIG3, F24H 302, H02H 500

Patent

active

052870480

ABSTRACT:
An electronic safety circuit for a portable gas heater includes a transformer and half wave rectifier connected in parallel with a fan motor for charging a capacitor, and a solid state switching circuit, which may be either a pair of cascaded transistors, an SCR, or a Darlington switch, for applying a reverse polarity voltage across the solenoid of a solenoid operated gas valve to immediately turn off the gas valve in the event of loss of power to the combustion fan motor. The electronic safety circuit may be conveniently mounted on a PC board and enclosed in the combustion fan motor.

REFERENCES:
patent: 4090664 (1978-05-01), Elderkin
patent: 4978292 (1990-12-01), Donnelly et al.
patent: 4981262 (1991-01-01), Jackson
patent: 5052367 (1991-10-01), Beavers et al.

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