The utility model discloses a
control circuit of a
grinding machine. The
polishing machine comprises a processor, a
voltage stabilizing circuit, an input and output
assembly, a switch control
assembly, a 5V boosting module, a switch
assembly, a motor driving module and a digital display screen, the input and output assembly comprises a motor output end and a charger input end, the motor output end is connected with a
polishing motor, and the motor output end is connected with the processor through the motor driving module. One end of the
voltage stabilizing circuit is connected with the processor, the other end of the
voltage stabilizing circuit is connected with a rechargeable
lithium battery, the rechargeable
lithium battery is connected with the input end of the charger through a 5V boosting module, a charging
overvoltage protection unit is connected between the 5V boosting module and the input end of the charger, and the switch control assembly, the switch assembly and the digital display screen are all connected with the processor. The utility model has the beneficial effects that the safe and reliable work of the
grinding machine is ensured; the working state and fault information of the
grinding machine can be visually known in real time, and therefore the grinding machine can be maintained in time.