Patent ID: 6791281
Filing Date: 2004-09-14
Classification: H05B,Y02B

Abstract:
A high-pressure discharge lamp lighting apparatus, comprising:an LC resonance circuit, wherein the LC resonance circuit has a resonance frequency set up in two to three times the steady lighting frequency of the high-pressure discharge lamp, and the LC resonance circuit is connected to the high-pressure discharge lamp; a DC power source; an inverter circuit, wherein the inverter circuit has an input terminal connected to the DC power source, and an output terminal connected to the high-pressure discharge lamp through the LC resonance circuit, and the inverter circuit converts the DC power of the DC power source into an AC power, and causes to start and steadily operate the high-pressure discharge lamp; and an inverter control circuit, wherein the inverter control circuit is connected to a control terminal of the inverter circuit, the inverter control circuit operates the inverter circuit at a frequency around or higher than the resonance frequency of the LC resonance circuit at the time of starting the operation of the high-pressure discharge lamp, and the inverter control circuit operates the inverter circuit at a frequency in a range lower than the resonance frequency of the LC resonance circuit and free from acoustic resonance in the steady lighting operation of the high-pressure discharge lamp.