| 摘要 |
PROBLEM TO BE SOLVED: To obtain an inexpensive synchronous rectification DC-DC converter having simple circuitry, without having to provide a reverse current detecting means, unlike in the conventional examples. SOLUTION: The synchronous rectification type DC-DC converter includes a switching element 50 connected in series with the tertiary coil 33 of a transformer 30. The converter further comprises a switching element drive circuit (diode 51 and capacitor 52). The drive circuit is connected to an output voltage detection circuit 19 for detecting the output voltage from the induced voltage of the tertiary coil 33. Based on the detected voltage from the output voltage detection circuit 19, the drive circuit drives and controls the switching element 50 so that the switching element 50 is turned on, when a signal which turns on a main switching element 1 is supplied and is turned off, when a signal which turns off the main switch element is supplied. COPYRIGHT: (C)2004,JPO&NCIPI
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