| 摘要 |
PROBLEM TO BE SOLVED: To provide a three-phase input DC power supply that eliminates the need for additional components, and balances currents of each phase without adjustment. SOLUTION: First to third rectification smoothing circuits comprising single-phase full-wave rectifiers 2, 3, 4, reactors 5, 6, 7 and capacitors 8, 9, 10, are connected to each AC power supply of a three-phase AC power supply 1, to form independent DC power supplies, respectively. Series circuits comprising each of primary windings 14a, 15a, 16a of transformers 14, 15, 16 and each of switch elements 11, 12, 13, are connected to those DC power supplies in parallel, respectively. An oscillation control circuit, which turns on/off the switch elements 11, 12, 13 simultaneously, is connected to the DC power supplies. A fourth rectification smoothing circuit comprising diodes 19, 20, a reactor 21 and a capacitor 22, is connected to a series circuit of secondary windings 14b, 15b, 16b of the transformers 14, 15, 16. COPYRIGHT: (C)2011,JPO&INPIT |
