Patent ID: 7355433
Filing Date: 2008-04-08
Classification: G01R

Abstract:
1. A circuit for performing an unclamped inductive test on a metal oxide semiconductor field effect transistor (MOSFET) device driven by a gate driver comprising: a current sense circuit for measuring an unclamped inductive testing (UIS) current that increases with an increase of a pulse width inputted from said gate driver to said MOSFET device wherein said current sensing circuit is provided to turn off said gate driver when a predefined UIS current is reached; and a first switch for switching ON/OFF a power supply to said MOSFET device and a second switch connected between a drain and source terminal of said MOSFET wherein said first switch is controlled to switch OFF and said second switch is controlled to switch ON upon detection of a MOSFET failure under said UIS test to prevent damages to a probe.