Protection and detection device of inverter

The utility model discloses a protection and detection device of an inverter. The device comprises electronic components of a blocking capacitor, an isolating transformer and a fuse, a capacitor, a thermistor and a diode, and is used for avoiding the damage of a high-power semiconductor device after an open circuit is damaged by an inverter input filter capacitor. The device is connected at both ends of the inverter input filter capacitor, changes the output DC impedance of the protection and detection device according to the existence of the high-frequency peak voltage, provides signal for a post-stage control circuit, and realizes the protection for the inverter.