| 摘要 |
A DC power source device is provided which comprises conduction detectors 17, 18 for producing detection signals V<SUB>P1</SUB>, V<SUB>P2 </SUB>during the detective period of rectification MOS-FETs 15, 16 and timer circuits 19, 20 connected to polarity detectors 17, 18 . Timer circuits 19, 20 count output time of detection signal V<SUB>P1</SUB>, V<SUB>P2 </SUB>from polarity detectors 17, 18 until electric current through one of rectification MOS-FETs 15, 16 comes to zero, and turns the other of rectification MOS-FETs 15, 16 off immediately before termination of the counted time so that timer circuits 19, 20 can reliably turn rectification MOS-FETs 15, 16 off during the conductive period of forward current flow for efficient synchronous rectification.
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