Patent ID: 8981663
Filing Date: 2015-03-17
Classification: H01J,H05B,Y02B

Abstract:
1. An electrodeless plasma lamp comprising: a lamp body comprising a dielectric material having a relative permittivity greater than 2; a lamp drive circuit coupled to the lamp body and configured to provide radio frequency (RF) power to the lamp body at RF power frequency, the RF power frequency being at least proximate a resonant frequency for the lamp body; and a bulb adjacent to the lamp body, the bulb containing a fill that forms a plasma when the RF power is coupled to the fill from the lamp body, the lamp drive circuit including a modulation control circuit to control modulation of the RF power frequency across a frequency band, wherein the frequency band is around the resonant frequency and the modulation is configured to reduce a peak amplitude of the RF power while maintaining average power to the plasma.