Frequency sensitive switching circuit

Details Frequency sensitive switching circuit Frequency sensitive switching circuit

G - Physics

05

F

323/10, 315/30

G05F 1/44 (2006.01) H02J 13/00 (2006.01) H05B 41/00 (2006.01)

Patent

CA 1133055

FREQUENCY SENSITIVE SWITCHING CIRCUIT ABSTRACT OF THE DISCLOSURE A switching circuit for energizing a load, such as fluorescent lamp ballast, in response to a control signal of preselected frequency superimposed on AC power circuits which supply the load. A triac is gated to conduct the AC power to the load by a circuit including an impedance element and a series resonant LC network tuned to the frequency of the control signal. The gate circuit is arranged to block the control signal during all but a small portion of each half cycle of the applied AC power, thereby reducing the consumption of control signal power.

326929

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