| 摘要 |
To improve the power conversion efficiency of a power circuit provided with a power-factor improvement converter (10; 11; 12; 13) and reduce the size, weight, and cost of the circuit, the power-factor improvement converter is provided at a stage in front of a switching power circuit (1), and comprises a self-excited current resonant switching converter with a simple circuit construction, the switching voltage thereof being fed back to a rectifying path via series resonant circuits so as to improve the power factor. <IMAGE> |
