Patent ID: 8917117

Claim:
A composite semiconductor device having a structure in which a first power semiconductor element and a second power semiconductor element, each having a first terminal, a second terminal, and a third terminal, and each passes current from the second terminal to the third terminal according to a signal input from the first terminal, are formed in a single substrate, wherein the third terminal of the second power semiconductor element is electrically connected to the first terminal of the first power semiconductor element, and a current path for transferring electric charge from the second terminal of the first power semiconductor element to the first terminal of the second power semiconductor element, and another current path for transferring electric charge from the second terminal of the second power semiconductor element to the first terminal of the first power semiconductor element, when the potential of the second terminal of the first power semiconductor element is increased with time, are provided, and a resistor is provided between the first terminal of the second power semiconductor element and the third terminal of the second power semiconductor element so as to cause current to be supplied from the third terminal of the second power semiconductor element to reduce a falling rate of a potential of the first terminal of the first power semiconductor element, when the potential of the first terminal is changed to stop a current between the second terminal and the third terminal in the first power semiconductor element and the potential of the second terminal of the first power semiconductor element is increased with time.