Overcurrent and overvoltage protection detection circuit

The utility model discloses an overcurrent and overvoltage protection detection circuit. The circuit comprises a sampling unit, a rectifying unit, a comparison unit and an output unit. The rectifying unit uses a three-phase full wave rectifying bridge and two resistors which are connected in series to carry out rectifying and voltage dividing on a three-phase weak signal acquired by sampling of the sampling unit, so as to acquire the positive maximum value and the negative maximum value of voltage, which are corresponding to the weak signal. The comparison unit compares the positive maximum value with a positive reference signal through a first comparator and compares a negative reference signal with the negative maximum value through a second comparator. Two comparison results are output to a controller through a line and logic of the output unit. According to the utility model, simply by using a rectifying bridge, two resistors and two comparators, overcurrent and overvoltage detection can be realized; and