Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1986-08-06
1987-10-20
Dixon, Harold
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315219, 315223, 315226, 315244, 315DIG7, H05G 3702
Patent
active
047016710
ABSTRACT:
A current fed high frequency oscillator-inverter ballast circuit includes a parallel resonant tank circuit for driving a pair of series connected discharge lamps via a series ballast capacitor. A regenerative power supply switches on when a fluctuating main DC supply voltage drops below a given level thereby providing a constant level auxiliary DC supply voltage to the oscillator inverter to maintain oscillation and lamp operation. When the main DC supply voltage exceeds said given level, the regenerative power supply switches out. The oscillation frequency is f.sub.2 during operation of the main supply and automatically switches to a frequency f.sub.1 when the regenerative power supply takes over. The frequency shift is automatic during each half cycle of a 60 Hz AC supply and is in a direction so as to maintain lamp current relatively constant. A novel high frequency leakage transformer may be provided to couple the high frequency inverter to the discharge lamp load to provide both a current limiting (ballast) action and automatic control of the lamp heater current to maintain high efficiency operation.
REFERENCES:
patent: 4109307 (1978-08-01), Knoll
patent: 4127795 (1978-11-01), Knoll
patent: 4259614 (1981-03-01), Kohler
patent: 4388561 (1983-06-01), Koshimura et al.
Fellows Mark W.
Steneck Walter G.
Stupp Edward H.
Dixon Harold
Franzblau Bernard
Mayer Robert T.
North American Philips Corporation
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