To provide a discharge lamp lighting device with a simple structure and a dimming lower limit enlarged, and to provide a lighting fixture using the same.
The discharge lamp lighting device is provided with a DC power source circuit 1 for outputting a DC voltage Vdc, a high frequency power source circuit 2 for generating from the DC voltage Vdc output from the DC power source circuit 1 and outputting a high frequency power, a resonance circuit 3 which is arranged between the high frequency power source circuit 2 and an electrodeless discharge lamp 4 and supplies the high frequency power to the electrodeless discharge lamp 4, a dimming control circuit 5 for dimming-controlling the electrodeless discharge lamp 4, and a frequency controlling section 6 of changing a high frequency power source circuit 2 driving frequency. When the high frequency power of the resonance circuit 2 is maximal, a dual resonance circuit is structured so that an output voltage Vout may become minimal and the driving frequency is changed so that the output voltage Vout may become minimal.
YAMAMOTO SHOHEI
KIDO HIROSHI
