Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit
Patent
1978-12-29
1980-10-21
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Inductance in the condenser circuit
315199, 340171R, 340310A, H05B 3702, H04Q 144
Patent
active
042296811
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. 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.
REFERENCES:
patent: 3473101 (1969-10-01), Muskovac
patent: 3644755 (1972-02-01), Shaw
patent: 3971010 (1976-07-01), Foehn
Coleman Edward J.
GTE Products Corporation
LaRoche Eugene R.
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