Patent ID: 7589478
Filing Date: 2009-09-15
Classification: H05B

Abstract:
1. An inverter circuit for discharge lamps for a multi-lamp surface light source, said inverter circuit comprising: at least two coils connected to a secondary winding of a step-up transformer of the inverter circuit without having a capacitor connected in series between the at least two coils and the secondary winding, the at least two coils being connected and magnetically coupled to each other and arranged to form a shunt transformer for shunting current such that opposing magnetic fluxes are generated by the at least two coils which cancel each other out; and at least two discharge lamps connected to said at least two coils, respectively, with currents flowing through said at least two discharge lamps balanced with each other, wherein the at least two discharge lamps are arranged as backlights in a surface light source in which an electrically conductive reflector is arranged in close proximity to said at least two discharge lamps, such that parasitic capacitances are generated between said discharge lamps and said adjacent conductor, said parasitic capacitances being generated in response to said backlights being added to each other as appropriate via said shunt transformer, wherein: