Frequency sensitive switching circuit

Details Frequency sensitive switching circuit Frequency sensitive switching circuit

1978-06-05

1979-09-25

Yusko, Donald J.

Communications: electrical

Systems

Selsyn type

340171R, 315294, 315315, 315DIG7, H04Q 910, H05B 4123

Patent

active

041692594

ABSTRACT:
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 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.

REFERENCES:
patent: 3898553 (1975-08-01), Boggett
patent: 3919596 (1975-11-01), Bellis
patent: 3971010 (1976-07-01), Foehn
patent: 4134043 (1979-01-01), Nuver

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