Electronic ballast having improved power factor and total harmonic distortion
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United States of America Patent
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Oct 23, 2007
Grant Date -
Jan 2, 2003
app pub date -
Jun 22, 2001
filing date -
Jun 22, 2001
priority date (Note) -
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Abstract
An electronic ballast for driving a gas discharge lamp includes a rectifier, a valley-fill circuit, an inverter having first and second series-connected controllably conductive switches having complementary duty cycles, a control circuit for controlling the controllably conductive switches, and an independent cat ear power supply to provide power to the ballast control circuits. The result is a ballast having substantially improved power factor, THD, and current crest factor. In a preferred embodiment, the valley-fill circuit includes an energy storage device that stores energy in response to a controllably conductive switch. In an especially preferred embodiment, the controllably conductive switch of the valley-fill circuit is also one of the switches of the inverter.
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