| 摘要 |
PURPOSE:To reduce a current capacity of a semiconductor switching element in a inverter and decrease wiring loss by controlling current, with input voltage of an inverter being heightened through a DC-DC converter. CONSTITUTION:Commercial power-supply current is full-wave rectified in a full-wave rectifier circuit 1 and supplied into a DC-DC converter 9 for boosting. A transistor 9b in this converter 9 is controlled by an electrification-factor controller 12 and a base circuit 13, and current flows into a reactor 9a to store magnetic energy at the on period of the transistor 9b. At the off period of the transistor 9b, energy is supplied into a condenser 9d and an inverter 5 through a diode 9c, so as to boost the input voltage of the inverter 5 higher than the input voltage of the converter 9. Consequently, as the current of the inverter 5 can be controlled at a low level, current capacity of a switching element in the inverter 5 can be reduced, together with decreasing a wiring loss, which is caused by wiring resistance in both the inverter 5 and the primary winding or the like in a high voltage transformer 6.
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