Patent ID: 8971079
Filing Date: 2015-03-03
Classification: H02M

Abstract:
1. An inverter device comprising: an inverter circuit which includes an upper-arm-use first switching element and a lower-arm-use second switching element; a control circuit which outputs a first signal which is an on or off (ON/OFF) command for the first switching element and a second signal which is an ON/OFF command for the second switching element respectively; a first drive circuit which performs ON/OFF driving of the first semiconductor switching element based on the ON/OFF command which is the first signal; a second drive circuit which performs ON/OFF driving of the second semiconductor switching element based on the ON/OFF command which is the second signal; a first photocoupler having a first light emitting element for an input side of the first photocoupler and a first photosensitive element for an output side of the first photocoupler, the first photocoupler transmitting the first signal to the first drive circuit; a second photocoupler having a second light emitting element for an input side of the second photocoupler and a second photosensitive element for an output side of the second photocoupler, the second photocoupler transmitting the second signal to the second drive circuit; and a signal switching part which directly transmits the first and second signals outputted from the first photocoupler and the second photocoupler to the corresponding first and second drive circuits respectively when at least one of the first and second signals is an OFF command, the signal switching part inputting an OFF command from the first photocoupler and the second photocoupler to the corresponding first and second drive circuits respectively when both the first and second signals are ON commands, wherein