Electronic gas valve power interruption switch
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United States of America Patent
Stats
-
Feb 15, 1994
Grant Date -
N/A
app pub date -
May 22, 1992
filing date -
May 22, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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