| 摘要 |
PROBLEM TO BE SOLVED: To provide a more highly reliable voltage detection method for surge voltage control and short-circuit protection of power switching elements connected in parallel and a power conversion device using this method. SOLUTION: This device is made up of a power converter comprising a plurality of connected-in-parallel power switching elements 1 each having a high-voltage side terminal 4 and a low-voltage side terminal 5, a control means that controls the control electrode of the power switching elements, and voltage detection circuits structured by connecting in series a plurality of resistors 6, 7 provided between the high-voltage side terminal 4 and the low-voltage side terminal 5 of each power switching element 1. Of the voltage values detected by each voltage detection circuit, the maximum detected voltage value is regarded as the detected voltage value of a plurality of the power switching elements 1 connected in parallel. The control means controls the control electrode of the power switching elements 1 according to the detected voltage value. COPYRIGHT: (C)2007,JPO&INPIT
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