Lighting device of discharge lamp

• Main Authors: YOKOSEKI ICHIRO, MAITA SHOHEI, KATO YOSHITO
• Format: Patent
• Language: English
• Published: 23.02.2005
• Edition: 7
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION

Provided is a discharge lamp lighting device provided with a neutral point type stepdown noninverting inverter, having a simple circuit configuration and few higher harmonic wave. This discharge lamp lighting device is provided with a bridge rectifying/converting circuit formed by parallel connection of a series circuit of a pair of switching elements switching by high frequency by turns and a series circuit of a pair of rectifying devices, and connected with a low-frequency AC power supply AC between AC input ends between a junction of the switching elements and a junction of the rectifying devices, a chopper circuit containing at least one of a counter-electromotive force feedback circuit with inductors inserted in a position on a circuit through which the low-frequency AC current and high frequency current flow bidirectionally and switching elements, a resonant circuit RC resonating with high-frequency voltage, and a discharge lamp to which the resonance voltage is applied.