Patent ID: 11879930
Assignee: FUJI ELECTRIC CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A test circuit for conducting a test on a switching device, the switching device having a ground electrode, a control electrode, and a power-supply electrode, the test circuit comprising:
a first terminal configured to receive a drive signal to turn on and off the switching device;
a second terminal coupled to the ground electrode of the switching device;
a third terminal coupled to the control electrode of the switching device;
a fourth terminal coupled to the power-supply electrode of the switching device; and
a clamping circuit coupled between the second terminal and the fourth terminal,
the clamping circuit being configured to, upon turning on of the switching device responsive to the drive signal, cause a voltage at the third terminal to be a first voltage higher than a threshold of the switching device, and
the clamping circuit being configured to, upon turning off of the switching device responsive to the drive signal, and while clamping a voltage at the fourth terminal to a second voltage lower than a withstand voltage of the switching device, cause the voltage at the third terminal to be a third voltage that is between the threshold of the switching device and the first voltage.