公开(公告)号：US20220158633A1

公开(公告)日：2022-05-19

申请号：US17435583

申请日：2020-02-27

Applicant: Webasto SE

Inventor： Philipp ECK

IPC: H03K17/18 ,  G01R31/27 ,  G01R31/26 ,  H03K17/082

Abstract: The invention provides a method for checking a semiconductor switch for a fault, wherein the semiconductor switch is driven with a PWM signal with a variable duty cycle. To the benefit of determining faults on the semiconductor switch reliably and cost-effectively, it is provided that if the semiconductor switch is operated with a duty cycle of 100% or 0%, the current measurement of the overall system is evaluated, while if the semiconductor switch is operated with a duty cycle of between 0% and 100%, the generated voltage pulses across the semiconductor switch are evaluated.