Multiple pulse width modulation waveforms for plasma lamp
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United States of America Patent
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Feb 17, 2015
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Mar 6, 2014
app pub date -
Aug 31, 2012
filing date -
Aug 31, 2012
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Abstract
This disclosure is directed to devices and methods for generating light with electrode-less plasma lamps. More particularly, the present invention provides plasma lamps driven by a radio-frequency source without the use of electrodes inside the bulb, and a pulse-width modulation device that provides RF power regulation, and related methods. The bulb comprises gaseous material with metal halides and/or light emitters that, when powered, substantially stays in an arc shape state. The switching pulse-width modulation device is operable at specific modulation frequencies, duty cycles, and durations to stabilize or control the arc state/mode, which enables consistent and high efficiencies.
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