Patent ID: 7961472

Claim:
An electric circuit device comprising: a plurality of semiconductor chips; a plurality of plate-shaped conductors electrically connected to said plurality of semiconductor chips; and a plus side terminal and a minus side terminal for transmitting direct current; wherein said plurality of semiconductor chips includes a first insulated gate bipolar transistor and a first diode constituting an upper arm portion of an inverter circuit, and a second insulated gate bipolar transistor and a second diode constituting a lower arm portion of the inverter circuit; said plurality of plate-shaped conductors includes an intermediate plate-shaped conductor that connects said upper arm portion of the inverter circuit and said lower arm portion of said inverter circuit, a plate-shaped conductor for direct-current positive polarity, and a plate-shaped conductor for direct-current negative polarity; said intermediate plate-shaped conductor, said plate-shaped conductor for direct-current positive polarity, and said plate-shaped conductor for direct-current negative polarity are arranged to provide a first region in which said intermediate plate-shaped conductor, said plate-shaped conductor for direct-current positive polarity, and said plate-shaped conductor for direct-current negative polarity are laminated, a second region in which only said intermediate plate-shaped conductor and said plate-shaped conductor for direct-current positive polarity are opposed, and a third region in which only said intermediate plate-shaped conductor and said plate-shaped conductor for direct current negative polarity are opposed; said first insulated gate bipolar transistor and said first diode are arranged in the second region that is inserted between said intermediate plate-shaped conductor and said plate-shaped conductor for direct-current positive polarity; said second insulated gate bipolar transistor and said second diode are arranged in the third region that is inserted between said intermediate plate-shaped conductor and said plate-shaped conductor for direct-current positive polarity; said plate-shaped conductor for direct-current positive polarity is connected with a part that forms said first region of said plate-shaped conductor for direct-current positive polarity; and said plate-shaped conductor for direct-current negative polarity is connected with a part that forms said first region of said plate-shaped conductor for direct-current negative polarity.