Patent ID: 8039954

Claim:
A bidirectional switch module including a bidirectional switch circuit in which a plurality of semiconductor elements are combined and in which a current can flow bidirectionally from a first terminal to a second terminal and from the second terminal to the first terminal, the bidirectional switch module comprising: a first metal base plate serving as a heat dissipation plate and connected to the first terminal; a second metal base plate serving as a heat dissipation plate and connected to the second terminal; a first semiconductor switch element provided on a first semiconductor chip having a pair of surfaces, including a first electrode provided on one surface of the first semiconductor chip and connected to the first terminal, a second electrode provided on other surface of the first semiconductor chip and serving as a current path to the first electrode, and a third electrode provided on the other surface of the first semiconductor chip and controlling a current between the first electrode and the second electrode, and mounted on the first metal base plate so that the first electrode and the first metal base plate face each other; a first diode element provided on a second semiconductor chip having a pair of surfaces, including a first cathode electrode provided on one surface of the second semiconductor chip and connected to the first terminal, and a first anode electrode provided on other surface of the second semiconductor chip, and mounted on the first metal base plate so that the first cathode electrode and the first metal base plate face each other; a second semiconductor switch element provided on a third semiconductor chip having a pair of surfaces, including a fourth electrode provided on one surface of the third semiconductor chip and connected to the second terminal, a fifth electrode provided on other surface of the third semiconductor chip and serving as a current path to the fourth electrode, and a sixth electrode provided on the other surface of the third semiconductor chip and controlling a current between the fourth electrode and the fifth electrode, and mounted on the second metal base plate so that the fourth electrode and the second metal base plate face each other; a second diode element provided on a fourth semiconductor chip having a pair of surfaces, including a second cathode electrode provided on one surface of the fourth semiconductor chip and connected to the second terminal, and a second anode electrode provided on other surface of the fourth semiconductor chip, and mounted on the second metal base plate so that the second cathode electrode and the second metal base plate face each other; a first control terminal connected to the third electrode; a second control terminal connected to the sixth electrode; and wires electrically connecting the first anode electrode, the second anode electrode, the second electrode, and the fifth electrode, respectively.