| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of controlling a DC-DC converter which can reduce switching loss in voltage step-down operation and conduction loss in synchronization rectification, and perform a bidirectional operation under the same control. SOLUTION: The bidirectional DC-DC converter is provided with first and second switch elements provided on a high voltage side of a transformer and alternately applying voltage of an opposite direction to a high-voltage side wiring based on a voltage step-down operation, and a synchronous rectification operation based on a voltage step-up operation; third and fourth switches provided on a low-voltage side of the transformer and performing a synchronous rectification operation based on a voltage step-down operation and applying a voltage of a reverse direction to a low-voltage wiring based on a voltage step-up operation; and an inductance element for continuing a current in the low-voltage side. The method of controlling this converter has a period for conducting the first and third switching elements, a period for conducting the first and fourth switching elements, and a period for switching an conduction status without providing a period when the first and second switch elements are in a non-conduction state for a predetermined period and the third and fourth switch elements are in a non-conduction status. COPYRIGHT: (C)2008,JPO&INPIT
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