Many people do not know the difference between inverter and variable frequency power supply, and some even think that is the same product, which is a big mistake. If you hold the view that to buy equipment that --- you miserable. 
 Oh, a joke, here to talk about the difference between inverter and variable frequency power supply you know, do not throw a brick at the Ha. 

 The concept of a variable frequency power supply and application purposes and areas 

 The inverter power supply is the AC mains through AC → DC → AC transformation, the output is pure sine wave output frequency and voltage is adjustable within a certain range. It is different from the frequency speed controller for the motor speed, but also different from ordinary AC power supply. The ideal AC power is characterized by the frequency stability, voltage stability, the internal resistance is equal to zero, the voltage waveform is pure sine wave (no distortion). The ideal AC power inverter power supply is very close, therefore, more and more advanced countries in the inverter power supply is used as the standard power supply in order to provide the best power supply electrical appliances, to facilitate an objective assessment of technical performance of the electrical. 

 Variable frequency power application purposes and areas: 

 World countries in the grid index is not a unified variable frequency power supply, the export of electrical appliances manufacturers need to supply analog different countries of the grid status in the design and development engineers, production line testing and product warranty of the product detect life, too high pressure / low pressure simulation testing and other applications to provide pure reliable, low harmonic distortion, high and stable rate of the sine wave of frequency and voltage regulator power output; imported original electrical equipment users also need its own power grid transformer, variable frequency in order to ensure the normal operation of the imports of electrical equipment; meet high frequency requirements of the avionics and military equipment. 

 The inverter power supply is mainly used for the manufacture or export traders on the export of electrical products, electrical testing, debugging and power supply for precision instruments. Widely used in home appliance manufacturing, electrical, electronics manufacturing, IT industry, computer equipment, laboratories. 

 Second, the inverter works 

 The inverter should be called the governor inverter. Refers to the frequency power supply (50Hz or 60Hz) transform into a variety of frequency (frequency 0 ~ 60HZ) to the motor variable-speed operation of the equipment. 

 The control circuit complete control of the main circuit, the rectifier circuit AC transform into DC, the DC intermediate circuit to smooth the output of the rectifier circuit, inverter circuit, DC and then reverse into AC. Inverter for vector control inverter this requires a lot of computation, sometimes also need a torque calculation of the CPU as well as some of the circuit. 

 Frequency Control by changing the frequency of the stator windings powered to achieve speed control purposes. 

 The above is the difference between inverter power supply and inverter, and more information on power products, please visit the Post Branch Power Institute of Technology. 

 Regulator (http://www.pandeng.org.cn)