Stepless speed control circuit of electric sprayer

A stepless speed control circuit of an electric sprayer, wherein an electric motor of the electric sprayer is powered by connection of positive and negative poles of a battery pack, characterized in that:

• the stepless speed control circuit comprises a stepless speed control switch, an LDO, an MCU and an MOS tube;
• the stepless speed control switch, adjusting working voltage of the electric motor through a sliding resistor, has its two terminals respectively connected to the positive pole of the electric motor and an input of the LDO, with the working voltage supplied to the MCU via an output of the LDO;
• the sliding resistor of the stepless speed control switch, also connected to the MCU, collects the voltage of the electric motor and sends it to the MCU;
• with the MOS tube connected in series to a negative power supply line of the battery pack, the MCU connects the MOS tube and controls the duty ratio thereof.