Electricity: power supply or regulation systems – Remote sensing
Patent
1975-01-03
1976-10-19
Pellinen, A. D.
Electricity: power supply or regulation systems
Remote sensing
323 19, 323 22SC, F23N 502, G05F 152
Patent
active
039873587
ABSTRACT:
A flame monitoring circuit in which a storage capacitor is connected between the "hot" line of an a.c. power supply and a flame electrode disposed so as to be bathed in the flame being monitored. Because of its rectification properties, the flame causes a flow of direct current that charges the storage capacitor providing a flame indicating signal voltage. A control circuit powered by the a.c. source is coupled to the storage capacitor so as to respond to either the presence or absence thereon of a d.c. signal voltage. Electrically coupling the storage capacitor and the control circuit is a sampling circuit for periodically sampling the energy level stored in the storage capaitor. The sampling circuit includes a discharge capacitor coupled to the storage capacitor so as to receive charging current therefrom and a complementary silicon-controlled rectifier is periodically activated to dump the energy from the discharge capacitor into the gate circuit of a silicon-controlled rectifier in the control circuit. The complementary silicon-controlled rectifier is fired at zero-crossings of the a.c. power source immediately preceding those half cycles during which flame rectified current is produced.
REFERENCES:
patent: 3619097 (1971-11-01), Clay et al.
patent: 3789383 (1974-01-01), Vasel
Pellinen A. D.
The Walter Kidde & Company, Inc.
Toupal John E.
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