Frequency sensitive switching circuit

H - Electricity – 05 – B

Patent

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315/28, 323/9

H05B 41/16 (2006.01) G05F 1/44 (2006.01) H05B 41/392 (2006.01)

Patent

CA 1133583

FREQUENCY SENSITIVE SWITCHING CIRCUIT ABSTRACT OF THE DISCLOSURE A switching circuit for energizing a load, such as fluorescent lamp ballasts, 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 cir- cuit 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 por- tion of each half cycle of the applied AC power, thereby reducing the consumption of control signal power, Further, a current limiting resistor is connected between the series resonant network and the triac to extend circuit life by protecting the triac from excess current without adversely affecting the signal- blocking function of the gate circuit.

341825

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