| 摘要 |
<p>An object of the present invention is to provide a current detection circuit for a power semiconductor device, the current detection circuit having a small circuit scale and a small number of parts, and generating a small amount of losses. The current detection circuit executes current detection utilizing a sense function of the power semiconductor device. An unknown magnitude of current flowing in power semiconductor devices 1, 11 is detected by a current-voltage conversion circuit 24 connecting to sense terminals S, S of the power semiconductor devices. The detected signal is delivered to a current direction detection circuit 27, which detects the direction of the current and delivers the detected current direction signal to an external CPU 3, which in turn gives gain-setting and offset-setting signals corresponding to the current direction signal. An output gain adjuster 221 adjusts a magnitude of gain and an output offset adjuster 231 adjusts a magnitude of offset to execute correction for difference between the characteristics of the sense region and the main region.</p> |
