Patent ID: 6118224
Filing Date: 2000-09-12
Classification: H05B

Abstract:
A discharge lamp lighting device, comprising:a rectifier for rectifying an AC power source;an inverter circuit including at least a switching element and converting a DC voltage into a high frequency voltage;a smoothing capacitor;a discharging diode inserted in a power supply path from the smoothing capacitor to the inverter circuit for passing therethrough a discharge current of the smoothing capacitor;first impedance element inserted in a power supply path from DC output ends of the rectifier to the inverter circuit;a series connection of a load circuit including a resonance circuit and a discharge lamp with second impedance element and inserted between an output end of the inverter circuit and the DC output ends of the rectifier; anda charging diode for allowing a charging current to flow to the smoothing capacitor through a path including the first impedance element, part of the load circuit and the switching element in ON period of the switching element;wherein the second impedance element allows a DC current to pass through a path including the charging diode, load circuit and inverter circuit having the switching element.