Power tool and motor drive system thereof

A motor drive system, comprising:

• an inverter coupled with two ends of a power supply, wherein the inverter comprises a plurality of semi-conductive switch elements, and is configured to convert a voltage provided by the power supply to an alternating current to drive a motor;
• a microcontroller coupled with two ends of the power supply, wherein the microcontroller works at an operation mode and a sleep mode, wherein the microcontroller is configured to output a drive signal to control a power mode of the plurality of semi-conductive switch elements in the inverter in the operation mode, and stop outputting the drive signal to the inverter in the sleep mode;
• and
• a trigger switch, wherein two terminals of the switch body are respectively coupled with the microcontroller, the trigger switch is configured to output a response signal to the microcontroller, and the microcontroller is configured to switch from the operation mode to the sleep mode or from the sleep mode to the operation mode according to the response signal.