| 摘要 |
PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device having a power conversion device to light up a discharge lamp with a small current-limiting element, using a switched capacitor assuring a low cost and high reliability and requiring no power factor improving circuit, by equipping the device with an input current distortion and higher harmonic suppressing function. SOLUTION: A discharge lamp lighting device is equipped with a voltage adjusting means for make charging and discharging to a plurality of capacitors C1-C5, using a smoothening capacitor C0 so that a prescribed voltage is obtained, a first switching means Si1 for connecting one of the capacitors C1-C5 to the input side according to the input voltage, so that the input current is drawn in while the input current higher harmonics are suppressed, and a second switching means Si2 for connecting one of the capacitors C1-C5 to the output side so that the discharge lamp is lighted stably, whereby the function for a means for suppressing the input higher harmonics is also exerted by the motion of drawing in the input current Is from the AC power supply Vs. |
