Lamp ballast with frequency modulated lamp frequency

Details Lamp ballast with frequency modulated lamp frequency Lamp ballast with frequency modulated lamp frequency

1993-04-23

1995-04-25

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315308, 315291, 315209R, 315247, 315DIG5, 315DIG7, G05F 100

Patent

active

054102219

ABSTRACT:
An electronic high frequency supply, such as a lamp ballast, having a full-wave rectifier, a storage capacitor charged to a voltage greater than the peak of the rectifier output, and an isolating diode between the rectifier and the diode. An inverter is connected to the energy storage capacitor, and has a high frequency inductive load circuit connected between the inverter output and a junction between the isolating diode and the storage capacitor. A capacitor, connected to the junction in parallel with a series circuit formed by the isolating diode and storage capacitor, forms a high frequency resonance circuit with the inductive load circuit. Current is drawn from the rectifier only as a series of pulses at the inverter frequency. To minimize variation in the high frequency load current, the inverter frequency is varied according to a sensed parameter which varies during each cycle of the rectifier output.

REFERENCES:
patent: 3611021 (1971-10-01), Wallace
patent: 4277728 (1981-07-01), Stevens
patent: 4471269 (1984-09-01), Ganser et al.
patent: 4782268 (1988-11-01), Fahnrich et al.
patent: 4862040 (1989-08-01), Nilssen
patent: 4873471 (1989-10-01), Dean et al.
patent: 5001400 (1991-03-01), Nilssen

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