DISCHARGE LAMP LIGHTING DEVICE, AND LUMINAIRE

摘要

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device capable of stably starting and lighting a discharge lamp even when load impedance varies; and a luminaire.

SOLUTION: A power conversion circuit 9 converts D.C. power to A.C. power to be supplied to a load circuit 29. A drive circuit 11 drives switching elements Q3 and Q4 of the power conversion circuit 9. A frequency control circuit 12 is equipped with a voltage control circuit 13 variably controlling a drive frequency of the drive circuit 11 from a start-point frequency to an end-point frequency to increase the output of the power conversion circuit 9 in startup. A resonance frequency calculation part 14 of the frequency control circuit 12 has a data table where a correspondence relationship between the load impedance of a load circuit 29 and the resonance frequency of a resonance circuit in lighting is set in advance, and extracts the resonance frequency of the resonance circuit from the data table based on the load impedance detected by an impedance detection circuit 16 before starting and lighting the discharge lamp to set the extracted resonance frequency to the end-point frequency.

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