CIRCUIT ARRANGEMENT FOR MONITORING A FLYBACK DIODE

• Main Author: FEUCHT THOMAS
• Format: Patent
• Language: Chinese; English
• Published: 16.03.2018
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention relates to a circuit arrangement for monitoring a flyback diode on a magnetic valve, which is controlled by means of pulse width modulation, which circuit arrangement contains at least one diode (D1) in a pulse width modulation control branch of the circuit arrangement and a monitoring transistor (T1). The diode (D1) in the control branch is connected to the flyback diode (FLD) to bemonitored, arranged in the forward direction and, upon exceeding the threshold voltage thereof, activates the monitoring transistor (T1), which then outputs a monitoring signal. In a test mode, the monitoring transistor is periodically interconnected, independently of other states in the circuit arrangement, and a periodic monitoring signal is thus generated which is conducted to the same output.If a sustained, high-level monitoring signal is detected there, it is determined that the flyback diode (FLD) is faulty. If a periodically high-level and then abating monitoring signal is detected, it is determined that the f