Patent ID: 7525255
Filing Date: 2009-04-28
Classification: H05B,Y02B

Abstract:
1. An inverter comprising: a first transformer; a second transformer, wherein a lamp structure is coupled in a floating configuration between a secondary winding of the first transformer and a secondary winding of the second transformer; a first two-switch network configured to generate a first alternating current signal across a secondary winding of the first transformer using a first control signal to control a first switch and a substantially inverted version of the first control signal to control a second switch, wherein first dead times are inserted between the first control signal and the substantially inverted version of the first control signal at respective first switch-over transitions; a second two-switch network configured to generate a second alternating current signal across a secondary winding of the second transformer using a second control signal to control a third switch and a substantially inverted version of the second control signal to control a fourth switch, wherein the first and the second alternating current signals have substantially constant duty cycles, and second dead times are inserted between the second control signal and the substantially inverted version of the second control signal at respective second switch-over transitions; and a controller configured to generate the first control signal and the second control signal, wherein power to the lamp structure is adjusted by varying a phase difference between the first control signal and the second control signal.