| 摘要 |
A chopper circuit generates a voltage to be supplied to a primary side of a transformer, and an inverter circuit supplies an output voltage of the chopper circuit to the primary side of the transformer in a positive phase or a negative phase. Thereby, an electric-discharge lamp connected to a secondary side of the transformer is lighted. A controlling section detects a lamp current, and thereby determines a type of the electric-discharge lamp. The controlling section decides the control value optimal for the chopper circuit and the inverter circuit on the basis of the determination result. The controlling section controls the chopper circuit and the inverter circuit with the decided control value. Thereby, the lighting device drives the electric-discharge lamp in an optimal state. For instance, the lighting device always makes the electric-discharge lamp lighting in a 100% light-modulated state regardless of its type.
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