| 摘要 |
PROBLEM TO BE SOLVED: To carry out full soft switching in an operating range in a bidirectional buck-boost chopper circuit without causing a non-soft switching range due to a snubber capacitor voltage residue even when an input/output voltage fluctuates. SOLUTION: A series connection body 70 composed of a diode 50, an auxiliary switch 40, and a saturable reactor 60 is connected between a connection point between a snubber capacitor 20 and a snubber diode 30 and direct-current power supplies 1a, 1b. When a voltage stored in the snubber capacitor is regenerated to the direct-current power supplies, the step-up ratio of the output voltage of a chopper portion to the voltage of the direct-current power supplies is set to 2 or above, to null a voltage remaining in the snubber capacitor 20. As a result, a non-soft switching range is not generated due to the snubber capacitor voltage residue even when the input/output voltage fluctuates, and full soft switching can be carried out in an operating range. COPYRIGHT: (C)2011,JPO&INPIT
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