Power converter in which switching elements are driven in parallel

摘要

A power converter for converting DC power to AC power by switching operation of a switching element includes: a bridge circuit configured by at least two series circuits using, as power input terminals, terminals on both sides of two switching elements connected to each other in series and using, as a power output terminal, a connection point of the two switching elements are connected in parallel via the power output terminal; a gate drive circuit for outputting a driving signal which controls to turn on/off the switching elements; and signal lines using a driving signal output terminal in the gate drive circuit as a starting point of wiring, individually hard-wired to each of the switching elements in each of series circuits to which the same driving signal is supplied from the driving signal output terminal, and having inductances which are configured equal to each other.

主权项

1. A power converter for converting input DC power to AC power by a switching operation of a switching element, comprising:
a bridge circuit configured by at least two series circuits using, as power in input terminals, terminals on both sides of two switching elements connected to each other in series and using, as a power output terminal, a connection point of the two switching elements connected in parallel via the power output terminal; a gate drive circuit having driving signal output terminals for outputting a driving signal which controls to turn on/off the switching elements by the same driving signal; and signal lines using the driving signal output terminals in the gate drive circuit as a starting point of wiring, each signal line individually hard-wired between one driving signal output terminal and a corresponding switching element, the signal lines having inductances which are substantially equal to each other, wherein the signal lines include:
gate signal lines individually hard-wiring a positive-side electrode in the driving signal output terminal and each of gate terminals of the switching elements in each of the series circuits to which the same driving signal is supplied from the driving signal output terminal; andemitter signal lines individually hard-wiring a negative-side electrode in the driving signal output terminal and emitter terminals of the switching elements in each of the series circuits to which the same driving signal is supplied from the driving signal output terminal.