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

Claim 7:
8. A testing method of conducting a test on a switching device, the switching device having a ground electrode, a control electrode, and a power-supply electrode, the testing method comprising:
preparing a test circuit including
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 including
a first diode configured to clamp a voltage at the fourth terminal, and
a first resistor provided between the first diode and the second terminal;

a first test step of conducting a static withstand voltage test to evaluate a withstand voltage of the switching device;
a selection step of selecting the first diode, based on a result of the static withstand voltage test, such that the voltage at the fourth terminal is lower than the withstand voltage of the switching device; and
a second test step of conducting the test using the first diode that has been selected.