Converter (Variable-frequency Drive,VFD) is the application of frequency conversion technology and microelectronics, by changing the frequency to control motor power supply AC motors power control equipment. Inverter is used primarily by rectification (AC-DC), the filter and the inverter (DC-AC), braking element, driven element, detection unit microprocessor unit and other components. Inverter IGBT breaking to adjust the output of the power supply voltage and frequency according to the actual needs of the motor to provide the needed power supply voltage, thus achieving the purpose of energy-saving and speed, in addition, the converter there are many protection functions, such as over current, over voltage, overload protection, and so on. With the improvement of industrial automation, inverter is also very widely used.
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