Discharge lamp lighting device

Details Discharge lamp lighting device Discharge lamp lighting device

H - Electricity

05

B

H05B 41/26 (2006.01) H05B 41/288 (2006.01) H05B 41/38 (2006.01)

Patent

CA 2308698

In a discharge lamp lighting device, a control circuit for turning first and second switching elements of a polarity inverting circuit alternately ON/OFF at a high frequency to alternately generate a longer ON period and a shorter ON period of the second switching element than those of the first switching element to apply a rectangular low frequency voltage to a discharge lamp, superimposes a DC component of the polarity inverting circuit upon a resonance pulse signals from a load resonance circuit to continuously change a switching frequency of the switching elements for the predetermined time from the start time point of one of the longer and shorter ON periods, and supplied to the lamp a first energy necessary for starting and lighting the lamp with a high pulse voltage obtained through LC resonance and for smoothly shifting the lamp to an arc discharge state.

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