VVVF is the direction of AC Speeding development. However, China's domestic development and Frequency inverter perform weakly, which is seriously relied on the foreign companies. therefore ,We think it necessary to make VVVF study ,and have made a certain research on the field of sinusoidal pulse width modulation technology .theoretical analysis and derivation have been made for its control strategy .control algorithms currently uses the constant voltage frequency control which is intensively adopted.
The system adopts Intel 80c196mc as CPU for the control system, which is particularly suitable for high speed control areas, such as motor vehicles and reversing equipments. Use of the micro controller in the design is the core component. Therefore, this paper briefly introduces the micro controller and related design characteristics, then introduces the hardware system and software design. Software algorithm is difficult to achieve.
Key words: Frequency inverter; constant voltage frequency control ; micro controller control ;micro controller 80C196MC