The frequency converter mainly consists of rectifier (AC to DC), filter, inverter (DC to AC), braking unit, driving unit, detection unit, microprocessor unit, etc. The frequency converter adjusts the voltage and frequency of the output power supply by breaking the internal IGBT, providing the required power voltage according to the actual needs of the motor, thereby achieving energy conservation and speed regulation. In addition, the frequency converter also has many protection functions, such as overcurrent, overvoltage, overload protection, and so on. With the continuous improvement of industrial automation, frequency converters have also been widely used.