| 摘要 |
PROBLEM TO BE SOLVED: To lower a peak factor of an output current and to avoid the increase of stress or noise of a switching device. SOLUTION: Peak values of charging currents of capacitors C11 and C12 in valley parts of a ripple output of a rectifier DB can be elevated, and peak values of charging currents of the capacitors C11 and C12 in peak parts of the ripple output can be lowered. The zero-voltage switching operations of switching devices Q1 and Q2, therefore, can be surely practiced, so that the increase of stress and noise of the switching devices Q1 and Q2 can be avoided. Further, as the decline of a resonance current of a load circuit 11 in a phase between the valley and peak of the ripple output of the rectifier DB can be suppressed, the decline of the output current can be avoided and the peak factor of the output current can be further lowered. |
