| 摘要 |
A switching power supply circuit is disclosed which maintains a power factor which can satisfy actual use conditions against a variation in load or ac input voltage. The switching power supply circuit includes a power factor improvement circuit for a composite resonance converter and is constructed such that a switching output obtained by voltage division by a primary side resonance capacitor formed from a series connection of first and second capacitors is fed back to the power factor improvement circuit. <IMAGE> |
