Ballast circuit with a capacitive and inductive feedback path

Details Ballast circuit with a capacitive and inductive feedback path Ballast circuit with a capacitive and inductive feedback path

1998-06-23

2000-02-22

Wong, Don

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315307, 315276, H05B 3700

Patent

active

060283998

ABSTRACT:
A circuit including a rectifier having rectifying diodes has a feedback signal which provides substantially linear operation of the rectifying diodes. In one embodiment, a ballast circuit includes a rectifier circuit coupled to an inverter circuit which energizes a fluorescent lamp. The inverter circuit includes a ballast capacitor coupled to an inductive feedback element. The voltages generated across the ballast capacitor and the feedback element combine to provide a feedback signal that is effective to periodically bias at least one of the rectifying diodes to a conductive state during substantially the entire AC input signal. The substantially linear operation of the rectifying diodes enhances THD and PF performance of the circuit.

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