| 摘要 |
PROBLEM TO BE SOLVED: To achieve the efficientization and downsizing by simplification of a circuit and reduction of loss. SOLUTION: This DC converter has a switch Q1 which converts the DC voltage of a DC power source Vdc1 into high frequency voltage, being switched on or off via primary winding 5a of a transformer T2, a series circuit which is composed of a switch Q2 and a clamp capacitor C2, being connected to both ends of the primary winding, synchronous rectification circuits Q4 and Q5 which synchronize and rectify the high frequency voltage of secondary winding 5b, a smoothing circuit which smoothes the rectified output of the synchronous rectification circuits by a smoothing reactor Lo and a smoothing capacitor Co, a capacitor C5 which accumulates, via a diode D5, the energy accumulated in the smoothing reactor Lo by the counterflow of the current of the synchronous rectification circuits at light load, a switch Q5 which feeds back the energy accumulated in the capacitor C5 to the primary side clamp capacitor C2 via a transformer, being switched on synchronously with the switch Q2, and a control circuit 10a which switches on or switches off switches Q1 and Q2 alternately. COPYRIGHT: (C)2006,JPO&NCIPI
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