The Study And Realization Of Small Power Inverter Equipment

The inverter apparatus controlled by pre- set voltage adjustment project has the advantages of low harmonic content, high output frequency precision, simple control circuit. Therefore, this kind of project is the hot point in inverter power studyingfield. The author designed and developed a single phase mid-frequency inverter control unit, which is based on dual micro- processor system. The inverter is modulated by pre-set SPWM pulse width wave. To show the designing and analyzing process of the control system, the article mainly discussed two parts. One is the power circuit part, which includes designing of the output fiher and the power transformer for the system, and also the way for IGBT controlling and protecting. The other is control system for the inverter, which includes the way of producing SPWM wave using microprocessor, the hard ware system of the inverter and the other assistant circuits. Tested by PSPICE simulation and small power experiment,the designing project "adjusting output voltage by changing on and off time of the SPWM" is practical. The author has completed development of the hard ware and soft ware for the control system based on the experiment. In the mean-time . a supervised VB software for the inverter based on WINDOWS98 operation system is also developed.