Hybrid ballast control circuit in a simplified package
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United States of America Patent
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-
Feb 2, 2010
Grant Date -
Nov 18, 2004
app pub date -
Apr 30, 2004
filing date -
Apr 30, 2003
priority date (Note) -
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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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