Patent ID: 9453872
Filing Date: 2016-09-27
CPC Classification: G01R

Claim Text:
1. A power cycle test apparatus for performing a power cycle test for an IGBT to be tested by applying a thermal stress to the IGBT to be tested through the intermittent application of a stress current thereto, the power cycle test apparatus comprising: a current source for applying an electrical current to the IGBT to be tested; a second current source connected in parallel to the IGBT to be tested; another IGBT to be tested having collector-emitter electrodes connected in series to collector-emitter electrodes of the IGBT to be tested; an IGBT for control connected in parallel to the another IGBT to be tested; and a controller for controlling the power cycle test apparatus, wherein the controller applies the stress current to the IGBT to be tested from the current source by turning on the another IGBT to be tested and turning off the IGBT for control, and thereafter the controller applies a current for measurement from the second current source to the IGBT to be tested by turning off the another IGBT to be tested and measures a collector-emitter voltage of the IGBT to be tested, the controller applies a second current for measurement from the current source to the IGBT to be tested by turning off the another IGBT to be tested and turning on the IGBT for control and measures the collector-emitter voltage of the IGBT to be tested immediately after the application of the second current for measurement is stopped, and the controller operates a junction temperature of the IGBT to be tested from the measured collector-emitter voltage and a temperature coefficient of the IGBT to be tested.