The entire circuit of the variable frequency power supply is composed of AC DC-AC filtering and other parts, so its output voltage and current waveforms are pure sine waves, very close to the ideal AC power supply. It can output the grid voltage and frequency of any country in the world. The frequency converter is composed of AC DC-AC (modulated wave) and other circuits. The standard name of the frequency converter should be the frequency converter. The waveform of the output voltage is a pulsed square wave, and there are many harmonic components. The voltage and frequency change proportionally at the same time, and cannot be adjusted separately, which does not meet the requirements of AC power. In principle, it cannot be used as a power supply, and is generally only used for speed regulation of three-phase asynchronous motors.
It can be seen that the two are obviously different, and the inverter can also be used as a power supply! Just overkill! The output of the frequency converter is added with sine filtering to obtain the frequency conversion power supply.
