Patent ID: 6967357

Claim:
A voltage-driven power semiconductor device of a pressure-contact type, comprising: an injection enhanced gate transistor (IEGT) having a collector on one side, and further having a main emitter, a current sense emitter electrically separated from the main emitter, a current sense terminal connected to the current sense emitter and configured to extract current flowing through the current sense emitter to an external protection circuit, a high-resistance base layer, and an MOS gate on an opposing side which opposes said one side, said MOS gate being arranged on a channel region between said collector and said main emitter with a gate insulating film interposed between said channel region and said MOS gate, a potential of said MOS gate being controlled according to an electric current passing through said current sense emitter via the protection circuit, electrical current from said collector being made to flow to both said main emitter and said current sense terminal, a carrier concentration in a current path defined between the main emitter and the collector having a maximum value at the opposing MOS gate side of the high-resistance base layer, and electron injection efficiency at said main emitter and said current sense emitter being 0.73 or more, the electron injection efficiency being defined by a ratio of an electron current and a total current consisting of the electron current and a hole current; a plate-like collector press-contacting electrode terminal arranged on said one side of said IEGT and electrically connected to said collector in compression contact with the collector; and a plate-like emitter press-contacting electrode terminal arranged on said opposing side of said IEGT and electrically connected to said main emitter in compression contact with the main emitter, wherein said voltage-driven power semiconductor device is configured as a press-contacting type package, said collector of said power semiconductor device is pressed by said plate-like collector electrode terminal so that said collector and said collector electrode terminal are electrically connected together, and said main emitter of said power semiconductor device is pressed by said plate-like emitter electrode terminal so that said main emitter and said emitter electrode terminal are electrically connected together.