Power electronic device short-circuit fault pre-detection circuit for bridge type converter

The invention discloses a power electronic device short-circuit fault pre-detection circuit for a bridge converter, which comprises a signal acquisition circuit and a signal comparison circuit, and is characterized in that the signal acquisition circuit is connected with a to-be-detected bridge converter to measure an output voltage signal of the bridge converter; the input of the signal comparison circuit is connected with the signal acquisition circuit, the output of the signal acquisition circuit is compared with a specific voltage, and whether overcurrent occurs or not is judged through the output of a comparator; the signal acquisition circuit is composed of a resistor; the signal comparison circuit is composed of a resistor, a capacitor, a voltage stabilizing diode and a comparator. The resistors realize a current limiting function and can realize voltage division of a voltage signal according to a certain proportion through series connection; whether the power electronic device has a short-circuit faul