| 摘要 |
PROBLEM TO BE SOLVED: To provide a switching power supply device capable of realizing a parallel operation in which a phase is shifted, with a simple and low-cost circuit. SOLUTION: The switching power supply device includes a first converter 3 in which switching elements Q11 and Q12 are connected in series to both ends of a DC power supply, a primary winding Np1 of a transformer T1a having an auxiliary winding Na1 and a capacitor Ci1 are connected in series to both ends of Q12, and a first rectifier circuit is provided to rectify a voltage generated on a secondary winding of the transformer T1a, a second converter 4 in which switching elements Q21 and Q22 are connected in series to both ends of the DC power supply, a primary winding Np2 of a transformer T2 and a capacitor Ci2 are connected in series to both ends of Q22, and a second rectifier circuit is provided to rectify a voltage generated on the secondary winding of the transformer T2, a smoothing circuit Co1 for smoothing the currents outputted from the first rectifier circuit and the second rectifier circuit, and a control circuit 11 which turns on/off the switching elements Q21 and Q22 according to a current of a serial resonance circuit 1 consisting of a resonance capacitor C1 and a resonance reactor L1 connected to an auxiliary winding. COPYRIGHT: (C)2010,JPO&INPIT |
