| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the power feed from a rectified power supply even if the voltage instantaneous value of the rectified power supply is lower than a smoothing capacitor voltage by a method wherein an auxiliary diode by which the forward direction current of the rrectified power supply is produced is connected to an auxiliary inductor. SOLUTION: If the polarity of the voltage of a vibration inductor 230 is downward, an auxiliary diode 150 is turned off and a downward voltage is applied to an auxiliary inductor 120 and an upward current is produced. If polarity of the vibration inductor 230 is upward, the auxiliary diode 150 is turned off. Therefore, a voltage equal to or higher than the instantaneous value of the voltage of a rectified power supply 110 is applied in a reverse direction and the off-state is maintained. The upward current of the auxiliary diode 150 in the off-period of the auxiliary diode 150 is made to flow into a smoothing capacitor 140 through the rectified power supply 110 to charge the smoothing capacitor 140. In this process, the feeding operation is performed by the rectified power supply 110 and the output of the rectified power supply 110 is inputted to the smoothing capacitor 140. |
