Patent ID: 7812571
Filing Date: 2010-10-12
Classification: G03B,H02J,H02M,H05B

Abstract:
1. A charging device for charging a main capacitor by rectifying an output voltage, which is boosted by a self-excited DC-DC converter, with a diode, wherein a control circuit of the self-excited DC-DC converter is configured to terminate an excitation period and to enter a charging period for charging the main capacitor by transmitting energy from a primary side to a secondary side of an oscillation transformer when a current value flowing in the primary side of the oscillation transformer reaches a first predetermined value, and to resume the excitation period in a delay time after detecting that a value of current flowing in the secondary side of the oscillation transformer is lower than a second predetermined value, and the delay time is set to be longer than a sum of a time from a time point when the value of current flowing in the secondary side of the oscillation transformer is lower than the second predetermined value to a time point when the current reaches zero and a reverse recovery time of the diode.