ADJUSTED PULSE WIDTH MODULATED DUTY CYCLE OF AN INDEPENDENT FILAMENT DRIVE FOR A GAS DISCHARGE LAMP BALLAST
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United States of America Patent
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Issued Date -
Aug 14, 2014
app pub date -
Feb 8, 2013
filing date -
Feb 8, 2013
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Abandoned
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Abstract
An electronic dimming ballast for driving a gas discharge lamp may be operable to control the duty cycle of an independent filament drive (IFD) to avoid hard switching and operation of the switches of the IFD outside their safe operating area. Such a ballast may include a first inverter for generating a first high-frequency alternating current (AC) voltage for powering the gas discharge lamp, and a second inverter for generating a second high-frequency AC voltage for heating the filament, wherein the second inverter is driven independent of the first inverter. The second inverter may be configured to adjust a duty cycle of the second high-frequency AC voltage from a starting duty cycle to a target duty cycle at a rate. The rate may be controlled to be below a threshold. The ballast may include a controller for maintaining the rate below the threshold.
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