Hybrid ballast control circuit in a simplified package

Details Hybrid ballast control circuit in a simplified package Hybrid ballast control circuit in a simplified package

2004-04-30

2010-02-02

Lee, Wilson (Department: 2163)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S225000

Reexamination Certificate

active

07656096

ABSTRACT:
A hybrid electronic ballast circuit includes a ballast control, half-bridge driver, and a power switch half-bridge in a single package. The ballast circuit includes a number of fault protections and safety features and is self-oscillating to drive a resonant circuit including a fluorescent lamp. Internal feedback and control signals are provided for a number of modes of operation, including startup, preheat, normal run mode and fault protection response mode. A voltage controlled oscillator adjusts the switching frequency of the switching half-bridge to maintain zero volt switching and minimum current switching. The entire ballast control may have only three external connections, and may be implemented in a TO220 package.

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Office Action issued by Japanese Patent Office on Oct. 3, 2006 in connection with corresponding Japanese patent application No. 2004-274054 and English translation of the Japanese Office Action.

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