Energy feedback device suppliers remind you that power supply is an auxiliary device for charging electrical appliances, but many people do not understand what variable frequency power supply is. With the progress of the times and the updating of electrical appliances, auxiliary equipment is constantly changing. Variable frequency power supply converts AC power from the mains through AC → DC → AC conversion, and outputs a pure sine wave with adjustable output frequency and voltage within a certain range. It is different from the variable frequency speed controller used for motor speed regulation, and also different from ordinary AC power supply. The characteristics of an ideal AC power supply are frequency stability, voltage stability, zero internal resistance, and a pure sine wave voltage waveform (without distortion). Variable frequency power supply is very close to the ideal social communication power supply. Therefore, more and more advanced cultural developed regions are using variable frequency power supply as a standard power supply, in order to provide excellent power supply network environment for electrical companies and objectively evaluate the technical product performance of electrical appliances. As is well known, there are two main types of variable frequency power supplies based on their structure: linear amplification type and SPWM switch type.
A frequency converter is composed of circuits such as AC straight current and AC (modulated wave), and its standard name should be frequency converter speed controller. Its output voltage waveform is a square wave pulse with multiple high-order harmonic components, and the voltage and frequency vary proportionally instead of being adjusted separately, which cannot meet the requirements of AC power supply. In principle, it cannot be used as a power source and is generally only used for speed regulation of three-phase asynchronous motors.
The entire circuit of a variable frequency power supply consists of parts such as information exchange, AC current, and filtering. Therefore, the voltage and current signal waveforms it outputs are pure sine waves, which are very easy to approach the ideal AC power supply system in society.
The principle and main function of a frequency converter: A frequency converter is an electrical energy control device that uses the on-off effect of power semiconductor devices to convert the power frequency power supply into another frequency. It can be divided into AC-AC frequency converter and AC-DC-AC frequency converter. AC-AC frequency converter can directly convert AC power into AC power with variable frequency and voltage; The AC-DC-AC frequency converter first rectifies AC power into DC power through a rectifier, and then converts this DC current into AC power with variable frequency and voltage through an inverter.