| 摘要 |
PROBLEM TO BE SOLVED: To improve the power factor of a control circuit for multiple-voltage power converter when a multiple-voltage power converter supplies AC power to a capacitance load by installing a specific-pulse increasing circuit to a single- phase voltage type inverter and accelerating the rise of an electric current by making the first ripple pulse immediately after the voltage polarity is switched specially larger. SOLUTION: Since a specific-pulse increasing circuit 40 is added to a second inverter 4, a pulse can be added to or deleted from the V-phase signal of the inverter 4. In the output voltage of the inverter 4, the magnitude (peak value) of the leading pulse immediately after the voltage polarity is switched becomes larger for a prescribed period and the large pulse appears at both ends of the serially connected secondary windings of two transformers 5 and 6. Therefore, the power factor of a control circuit for multiple-voltage power converter can be improved and the size of the converter can be reduced as a whole. |
