Variable-frequency drive (VFD) is a power control device that controls the AC motor by changing the working frequency of the motor by applying variable frequency technology and microelectronic technology. The frequency converter is mainly composed of rectification (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, and detection unit micro processing unit. The inverter adjusts the voltage and frequency of the output power supply by the internal IGBT breaking, and supplies the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. In addition, the frequency converter has many protection functions. Such as overcurrent, overvoltage, overload protection and so on. With the continuous improvement of industrial automation, inverters have also been widely used.

The basic structure of the inverter:

The frequency converter is a device that converts a commercial power supply (50 Hz or 60 Hz) into an AC power supply of various frequencies to realize variable speed operation of the motor, wherein the control circuit completes control of the main circuit, and the rectifier circuit converts the alternating current into direct current, and the middle of the direct current The circuit smoothes the output of the rectifier circuit, and the inverter circuit re-inverts the DC power into AC power. For a frequency converter such as a vector control inverter that requires a large amount of calculations, sometimes a CPU for torque calculation and some corresponding circuits are required.

Classification of the inverter:

There are various classification methods of frequency converters. According to the main circuit working mode, they can be divided into voltage type inverters and current type inverters. According to the switch mode classification, they can be divided into PAM control inverters, PWM control inverters and high carrier frequencies. PWM control inverter; according to the working principle, it can be divided into V/f control inverter, slip frequency control inverter and vector control inverter; according to the purpose classification, it can be divided into general inverter, high performance special inverter, High frequency inverter, single phase inverter and three phase inverter.

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Label: Basic structure and classification of the inverter

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