Patent ID: 7345434
Filing Date: 2008-03-18
Classification: H05B

Abstract:
1. A discharge lamp lighting apparatus, comprising: a DC power supply; an inverter circuit, connected to the DC power supply, and provided with at least a first switching device and a second switching devices; and a discharge lamp energized by the inverter circuit, wherein the first switching device has an on-duty complementarily different with an on-duty of the second switching device, the first switching device configured to substitute its on-duty with the complementarily different on-duty of the second switching device for every predetermined period comprised of a first period and a second period, wherein the inverter circuit executes a switching operation in that the on-duty of the first switching device substitutes with the on-duty of the second switching device, and wherein in the first period, the on-duty of the first switching device is “a” (0<“a”<1) and the on-duty of the second switching device is “1−a”, and in the second period, the on-duty of the first switching device is “1−a” and the on-duty of the second switching device is “a”.