The frequency converter has excellent controllability in the application of AC drive system, which can realize soft start and stepless speed regulation, and control acceleration and deceleration, so that the motor can obtain high performance and has remarkable energy-saving effect. Therefore, the application of frequency conversion speed regulation can improve the control precision, production efficiency and product quality of production machinery, thus facilitating the automation of the production process, and making frequency converters widely used in all aspects of industrial production in recent years. And it is also necessary to learn and understand the working process and principle of frequency converters. This paper mainly introduces the analysis of the main circuit principle of Sifang -VS500 series frequency converters, and draws the schematic diagram with protel99se to further understand the mapping of the control circuit diagram principle of frequency converters and the improvement of control chips.
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