Patent ID: 11881848
Assignee: WEBASTO SE
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 2:
3. A device for carrying out a method for checking a semiconductor switch for a fault, the method comprising:
driving the semiconductor switch with a PWM signal with variable duty cycle,
wherein when the semiconductor switch is operating with a duty cycle of 100% or 0%, evaluating the current measurement of an overall system into which the semiconductor switch is integrated,
wherein while when the semiconductor switch is operating with a duty cycle between 0% and 100%, evaluating the voltage pulses generated across the semiconductor switch; and
wherein the voltage pulses generated across the semiconductor switch (S3) are tapped off it via a capacitor (C4) and applied to an A/D converter (Q1, Q2), which applies a digital signal (Timer) to the counter input of a controller for the evaluation.