SEMICONDUCTOR POWER CONVERTER

摘要

PROBLEM TO BE SOLVED: To prevent an IGBT (Insulated Gate Bipolar Transistor) from being destroyed due to an overvoltage because of a voltage unbalance among the IGBTs when an overcurrent flows through the IGBTs connected in series configuring a power converter. SOLUTION: The power converter configured with a series connection of the IGBTs includes a means for increasing a gate voltage when a collector voltage of the IGBT gets higher and a means for increasing the gate voltage more than the gate voltage in a steady ON state of the IGBT when the collector voltage gets higher.