Lighting ballast having boost converter with on/off control and method of ballast operation
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United States of America Patent
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Jul 11, 2006
Grant Date -
Jun 15, 2006
app pub date -
Dec 14, 2004
filing date -
Dec 14, 2004
priority date (Note) -
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Abstract
A ballast for driving a gas discharge lamp comprising a rectifier stage having an alternating current (AC) input and providing a rectified output voltage, a boost converter stage receiving the rectified output voltage as an input and providing a boosted direct current (DC) output voltage across a DC bus, an inverter output stage for converting the DC bus voltage to a high-frequency AC output voltage to drive the lamp, further comprising a control stage receiving a desired light level signal controlling the desired light level of the lamp and providing an output control signal for turning the boost converter stage on or off in dependency on the desired light level signal. The ballast thereby has reduced power consumption at low light levels for greater energy efficiency.
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