Electronic ballast with pre-conditioner circuit

Details Electronic ballast with pre-conditioner circuit Electronic ballast with pre-conditioner circuit

1992-12-21

1995-12-26

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315307, 315219, 315DIG7, 315244, H05B 3700

Patent

active

054790743

ABSTRACT:
In an electronic ballast, a series-resonance-loaded half-bridge inverter is powered from a DC voltage and provides an AC voltage at an AC rail across which are connected plural lamp-ballast series-combinations, with each lamp-ballast series-combination consisting of a current-limiting capacitor series-connected with an instant-start fluorescent lamp. The DC voltage, which is obtained via a pre-converter, is controlled so as to maintain a predetermined magnitude even during the lamp ignition process. The 35 kHz AC voltage is generated by the half-bridge inverter powering a series-tuned L-C circuit near its natural resonance frequency. The AC rail is connected across the tank-capacitor of the L-C circuit. Except for being reduced so as to maintain total lamp current below a predetermined level on a sustained basis, the magnitude of the AC voltage is controlled to a given level in response to an AC control action applied to an AC control input.

REFERENCES:
patent: 4641061 (1987-02-01), Munson
patent: 4709189 (1987-11-01), Kuchii

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