Patent ID: 8659864

Claim:
A current detector circuit of a power semiconductor device, the power semiconductor device including a sensing function-equipped power semiconductor device, the power semiconductor device being divided into a main region and a sensing region, and including a main terminal connected to the main region and a sense terminal connected to the sensing region, the current detector circuit being connected to the sense terminal, the current detector circuit comprising: a current detector unit including a terminal into which a current to be detected is input, a terminal that has an input current as an output, and a current information output terminal that outputs detected current information; and a variable voltage source circuit including a control input terminal configured to control an output voltage; the current detector unit and variable voltage source circuit being connected in series; the current information output terminal of the current detector unit being connected to the control input of the variable voltage source circuit; the current detector unit and the variable voltage source circuit being connected to the sense terminal and the main terminal; and a potential of the sense terminal being regulated by the output voltage of the variable voltage source circuit based on the current flowing through the sense terminal, the variable voltage source circuit being configured to correct a difference in characteristics between the main region and the sensing region.