Patent ID: 9746513
Date: 2017-08-29
CPC Classifications: G01R

Claim:
1. A circuit arrangement, comprising: a thyristor circuit including at least one thyristor having an anode terminal and a cathode terminal; and a control device configured to control the at least one thyristor by applying a control signal to the at least one thyristor in order to switch the at least one thyristor into a conducting condition, measure and evaluate the at least one thyristor voltage that is present between the anode terminal and the cathode terminal during a test period subsequent to the application of the control signal, monitor whether the voltage of the at least one thyristor is decreasing during the test period for the evaluation of the voltage of the at least one thyristor, monitor whether the voltage of the at least one thyristor decreases initially and rises subsequently, monitor whether the voltage of the at least one thyristor falls below a first threshold and subsequently rises again and above a second threshold, and monitor whether the voltage of the at least one thyristor rises above the second threshold within a predetermined blocking delay time from a switching point of time.