| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for conversion into DC capable of realizing the miniaturization of a transformer and zero voltage switching of a switch, high efficiency and low noise. SOLUTION: This apparatus for conversion into DC comprises a first series circuit connected to both ends of a DC power supply Vdc1, and connected with a primary winding 5a of the transformer T and a switch Q1 in series; a second series circuit connected to both ends of the primary winding 5a, and connected with a switch Q2 and a snubber capacitor C3 in series; a saturable reactor SL1 connected to the primary winding 5a in parallel; an electric power supply source Idc1 for storing the electric power when the switch Q1 turns on, and for supplying the electric power to the snubber capacitor C3 when the switch Q1 turns off; a rectifying circuit which comprises a diode D1 connected to a secondary winding 5b of the transformer T in parallel, and a diode D2 connected to the diode D1 and the series circuit of the diode D1 and the secondary winding 5b in series; a smoothing circuit C4 connected to the diode D2 in series though a reactor L1; and a control circuit 10 which alternately turns on/off the switch Q1 and the switch Q2, and turns off the switch Q2 when a current of the switch Q2 increases. COPYRIGHT: (C)2004,JPO
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