Lamp ballast circuit characterized by a single resonant frequenc

Details Lamp ballast circuit characterized by a single resonant frequenc Lamp ballast circuit characterized by a single resonant frequenc

1994-10-26

1995-10-31

Pascal, Robert J.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Electric switch in the condenser circuit

315244, 315289, 315227R, 315DIG5, H05B 3700

Patent

active

054632846

ABSTRACT:
A lamp driving circuit having a series inductor and capacitor (L-C) in which the lamp load is connected in parallel with the capacitor. During pre-ignition of the lamp load, the driving signal supplied by a half-bridge oscillator includes a fundamental frequency and a third harmonic of the fundamental frequency. The resonant frequency of the series connected L-C circuit is at least .sqroot.5 times greater than the fundamental frequency but less than the third harmonic of the driving signal.

REFERENCES:
patent: 4060751 (1976-11-01), Anderson
patent: 4060752 (1977-11-01), Walker
patent: 4441055 (1984-04-01), Balchjunas
patent: 4641061 (1987-02-01), Munson
patent: 5013974 (1991-05-01), Nilssen
patent: 5214356 (1993-05-01), Nilssen

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