Neutral point voltage detection circuit of motor

The invention provides a neutral point voltage detection circuit of a motor. The neutral point voltage detection circuit comprises a neutral point voltage built-in unit and a capacitance sampling and transferring unit, wherein the neutral point voltage built-in unit is used for constructing a neutral point voltage of the motor according to terminal voltages of the three phases of the motor; the capacitance sampling and transferring unit is used for controlling corresponding high-voltage switch units in the capacitance sampling and transferring unit to be sequentially conducted in a non-overlapping manner according to a sampling signal and a holding signal, and outputting the neutral point voltage in a capacitance sampling and transferring manner; and the sampling signal and the holding signal respectively control the on-off of the corresponding high-voltage switch units in the capacitance sampling transferring unit. That is, according to the neutral point voltage detection circuit of the motor provided by the