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Frequency inverter is a kind of used to change the frequency of alternating current AC electrical equipment. In addition, it also has change the AC voltage auxiliary function. Frequency inverter usually contains two parts: rectifier and inverter. Rectifier converts the power of input AC to DC and inverter put the power of DC to the required frequency of alternating current. In addition to these two parts, frequency converter and may include transformer and battery. Among them, the transformer is used to change the voltage and can be isolated input/output circuit, battery energy loss to compensate frequency converter internal wiring. In addition to these two parts, frequency inverter also include transformer and battery. Among them, the transformer is used to change the voltage and be isolated input/output circuit, battery is used to compensate frequency inverter internal wiring energy loss.
Frequency inverter not only can be used to change the frequency of the AC power source, but also can be used to change the speed and torque of AC motor. In the application environment, the most typical two level inverter structure is three-phase voltage source inverter. Frequency inverter through semiconductor switching and pulse width modulation (PWM) to control the phase voltage. The power of the different frequency inverter can handle power is not the same, which include from several watts to several megawatts.