Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2007-07-05
2009-08-04
Vo, Tuyet (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S247000, C315S224000, C315S274000, C315S2090SC
Reexamination Certificate
active
07569998
ABSTRACT:
An apparatus and method for igniting a lamp during a strike mode of an inverter comprising: sequentially controlling a duty cycle sweep and a frequency sweep of driving signals in the inverter to provide an increasing output voltage to the lamp. One embodiment advantageously includes a closed feedback loop to implement the duty cycle sweep and the frequency sweep such that an open lamp voltage is reliably regulated during the strike mode. For example, the closed feedback loop stops the duty cycle sweep or the frequency sweep when the output voltage to the lamp reaches a predetermined threshold and makes adjustments to the duty cycle or frequency the driving signals as needed to keep the output voltage at approximately the predetermined threshold if the lamp has not ignited.
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Henry George C.
Lacombe David K.
Knobbe Martens Olson & Bear LLP
Microsemi Corporation
Vo Tuyet
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