Patent ID: 7446485
Filing Date: 2008-11-04
Classification: H05B,Y02B

Abstract:
1. A multi-lamp driving system for driving a plurality of lamps, comprising: a power supply circuit, comprising a second stage transformer, for supplying said plurality of lamps with an AC power, wherein said power supply circuit comprises a DC/AC converter for converting a DC power to a first AC power, and said second-stage transformer is coupled to said DC/AC converter for stepping up said first AC power to provide said AC power; first-stage transformers coupled to said second stage transformer for performing an impedance-matching function to balance lamp currents and deliver evenly distributed current to each lamp in said multi-lamp system so that each lamp provides approximately same amount of luminance, wherein the first-stage transformers are voltage amplified transformers, and the second stage transformer and the first-stage transformers perform two-stage voltage amplifying; and a voltage detection circuit coupled to a common node of said second-stage transformer and said first-stage transformer for detecting a voltage of said common node.