| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device and a lighting apparatus using the same, which can maintain the lighting of a discharge lamp even if an instantaneous blackout or voltage drop of an AC power source occurs. <P>SOLUTION: A discharge lamp lighting device 10 comprises: a DC power supply circuit 2 and down converter circuit 3 for converting an AC voltage supplied from an AC power source 1 to a DC voltage having a desired voltage value; an inverter circuit 4 for converting the DC voltage outputted from the down converter circuit 3 to an AC voltage whose polarity is periodically inverted to supply the converted AC voltage to a discharge lamp 6; a resonance circuit 5 for generating a startup voltage for starting-up the discharge lamp 6; a voltage detection circuit 7 for detecting a voltage state of the AC power source 1; and a control circuit 8c for controlling the inverter circuit 4. If the voltage detection circuit 7 detects an instantaneous blackout or voltage drop of the AC power source 1, the control circuit 8c sets an operational frequency of the inverter circuit 4 at a frequency in the neighborhood of a resonant frequency of the resonance circuit 5 or a frequency in the neighborhood of a frequency the reciprocal of an odd number times as large as the resonant frequency. <P>COPYRIGHT: (C)2013,JPO&INPIT |
