Method of reducing RMS load voltage in a lamp using pulse width modulation
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United States of America Patent
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Nov 6, 2007
Grant Date -
May 26, 2005
app pub date -
Feb 4, 2005
filing date -
Feb 4, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of converting a line voltage to an RMS load voltage in a lamp includes modulating a load voltage with a pulse width modulation circuit that is entirely within the lamp and provides an RMS load voltage to a light emitting element of the lamp. Conduction is triggered in the pulse width modulation circuit independently of a line voltage magnitude with a time-based signal source that defines a duty cycle of the pulse width modulation circuit suitable for the RMS load voltage.
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