Research And Implementation Of The Digital Controlled Inverter Power Supply

With the development of information technology, inverter power supplies are widely used. Analog circuits are used in traditional inverter power supplies to produce the output waveforms, but this causes such defaults as complex circuits, difficult test method and bad output waveforms. Full digital control can be realized when high performance DSP controllers are produced. The digital control system has advantages of flexible control, high integration, strong anti-disturb ability, the realization of advanced arithmetic and the convenience of real-time control .The system based DSP can realize flexible and precise real-time control as well as malfunction monitor by software.This article introduces digital control technologies of a single-phase SPWM inverter based on TMS320LF2407.firstly, the basic structure and the control strategy of the inverter system have been introduced, then selects repetitive control strategy as the control strategy for the inverter. System stability, steady state error is analyzed to designing the repetitive controller and presents the run application theory, and analyses the SPWM theory including the creating methods. Secondly, the bipolar SPWM control strategy and the univocal SPWM control strategy have been compared. After compared, the univocal SPWM control strategy is selected, and introduced the their respective control technique of the bipolar and univocal SPWM inverters.Thirdly, according to the technique request of the inverter power supply, the paper put forward the project of the hardware electric circuit and the control electric circuit that is exceptionally introduced, accomplishes the designs of system software and hardware. The system' main part is expatiated and the total structure is offered in the software design. The software carries out output wave control, creates digital sinusoidal norm and implements logical control functions of inverter that is, inverter protecting, monitoring and measurement and so on.Lastly, the inverter simulation model is established by the simulation software of MATLAB and SIMULINK, which is used to validate the feasibility of every control strategy. The research in the dissertation, to some extend, has paved a way for the further research, improvement and application in the digital control of inverter. Putting the simulation software into use in the process of the electric equipments design, It is good to reducing the time of the products design, and it is also benefit to improving the reliability of the products.