Variable-frequency Drive (VFD) is a power control equipment that applies frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor working power supply.
The frequency converter is mainly composed of rectification (AC to DC), filtering, inverter (DC to AC), brake unit, drive unit, detection unit, microprocessor unit, etc. The inverter relies on the internal IGBT to adjust the voltage and frequency of the output power supply, according to the actual needs of the motor to provide the power supply voltage it needs, so as to achieve the purpose of energy saving and speed regulation, in addition, the inverter 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.