Discharge lamp using spread spectrum
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United States of America Patent
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Mar 17, 2015
Grant Date -
Feb 17, 2011
app pub date -
Oct 16, 2007
filing date -
Oct 16, 2006
priority date (Note) -
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Abstract
An electrodeless plasma lamp and a method of generating light are described. The lamp may comprise a lamp body including a dielectric material having a relative permittivity greater than 2. A lamp drive circuit is coupled to the lamp body and configured to provide radio frequency (RF) power to the lamp body. A bulb containing a fill is positioned proximate the lamp body. The fill forms a plasma when the RF power is coupled to the fill from the lamp body. A lamp drive circuit including modulation control circuit is provided to control modulation of a frequency of the RF power across a frequency band. The circuit may be configured to provide RF power across a frequency band around a resonant frequency for the lamp body to reduce peak amplitude and electro-magnetic interference while maintaining average power to the plasma.
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