| 摘要 |
A switching power supply circuit including a configuration for power factor correction is disclosed which minimizes ripples and achieves a high power conversion efficiency. For power factor correction of a composite resonance converter including a partial resonance voltage circuit combined with a current resonance converter according to a half-bridge connection, a power factor correction circuit is configured such that primary side series resonance current obtained by a primary side series resonance circuit is regenerated and fed back as electric power to a smoothing capacitor. An insulating converter transformer of the composite resonance converter is formed such that the magnetic flux density therein is set so as to allow a secondary side rectification current to exhibit a continuous mode irrespective of any variation of the secondary side dc output voltage. |
