What is frequency converter?
The frequency converter transforms the alternating current in the mains from AC→DC→AC, and outputs a pure sine wave. The output frequency and voltage can be adjusted within a certain range. It is different from the frequency conversion speed controller used for motor speed control, and it is also different from the ordinary AC stabilized power supply. The ideal AC power supply is characterized by stable frequency, stable voltage, zero internal resistance, and pure sine wave (no distortion) in the voltage waveform. The variable frequency power supply is very close to the ideal AC power supply. Therefore, in advanced developed countries, the variable frequency power supply is increasingly used as a standard power supply in order to provide the most excellent power supply environment for electrical appliances and facilitate the objective assessment of the technical performance of electrical appliances. There are two main types of frequency converter: linear amplifier type and SPWM switch type.