The frequency converter is usually divided into four parts: rectifier unit, high capacity capacitor, inverter and controller.
Rectifier unit: the AC frequency will be fixed to direct current conversion.
High capacity capacitance: store converted energy.
Inverter: high-power switching transistor array composed of electronic switches, the DC into different frequency, width, amplitude of the square wave.
Controller: According to the set program work, control the amplitude of the output square wave and pulse width, so that superimposed as an approximate sine wave AC, drive AC motor.