To suppress an excessive current when the power is turned on and a voltage surge at the input and output of a power conversion device working as a power converter that is inputted with single-phase alternating-current power and obtains a three-phase alternating-current power with an arbitrary amplitude and frequency.
The power conversion device is provided with first and second charging circuits (capacitors) 531, 512 that respectively absorb the voltage surge produced on the input side and on the output side. The power conversion device is mounted with a voltage clamp snubber circuit including discharging circuits 583, 585 for discharging the electric charges in these charging circuits when the voltage of the capacitors exceed a predetermined voltage threshold value. As a result, the application of overvoltage to a bidirectional switch group is prevented, and a small and inexpensive power conversion device is configured.
MATSUSHIRO HIDEO
OGAWA MASANORI
Daisuke Nagano
Kentaro Fujii
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