Isolator circuit for use with frequency sensitive switching circ

Details Isolator circuit for use with frequency sensitive switching circ Isolator circuit for use with frequency sensitive switching circ

1978-12-29

1980-02-26

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Plural load device systems

Electric switch in the supply circuit

315244, 315258, 315294, 340171A, 340310A, H04Q 145, H05B 4136

Patent

active

041907906

ABSTRACT:
An isolator circuit for use with a switching circuit for energizing a ballasted load in response to a control signal of preselected frequency superimposed on AC power circuits which supply the load. In the switching circuit, 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 control signal may be one of a plurality of control signals having different frequencies superimposed on the power circuits. The isolator circuit is connected between the traic and the load and comprises a plurality of series connected parallel resonant LC circuits each tuned to block a respective one of the control signals. A series choke blocks spurious signal voltages.

REFERENCES:
patent: 3521267 (1970-07-01), Lester et al.
patent: 3729710 (1973-04-01), Sherwin
patent: 3971010 (1976-07-01), Foehn
patent: 4017845 (1977-04-01), Kilian et al.

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