Three-way dimming ballast circuit with passive power factor correction
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United States of America Patent
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Feb 2, 1999
Grant Date -
N/A
app pub date -
Nov 14, 1996
filing date -
Nov 14, 1996
priority date (Note) -
Expired
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Abstract
An improved ballast circuit controls the power delivered to a three-way dimmable fluorescent lamp for use in European countries and elsewhere where the input voltage is on the order of 220 volts. The ballast circuit comprises passive power factor correction to increase the overall power factor of the circuit to above 95% while also reducing the total harmonic distortion to less than 20%. Adaptations to connect a fluorescent lamp to a three-wire dimming switch are also included.
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