Research On Control Software Of Inverter System Based On TMS320F2812

With the rapid development of the new power electronic devices and the digital signal processors, digital control inverters are widely used nowadays. Because it has significant advantages compared with the analog control: such as simplifying hardware circuits design, overcoming the parameters drift of temperature in the analog circuits, flexible control and easily being carried out advanced control arithmetic, and so on. It makes design of power products not only reliable but also easy to make the mass production, and reduces the development cycle and cost. Therefore, digital control power has become the trend of switching power product design from now on.Combined with the latest development of modem technology of power electronic devices and digital signal processing, this paper studies the high-performance digital control system of inverter, with the TMS320F2812 as the dominant chip produced by TI Company for general motor control and the intelligent power module(IPM) as the main power devices of the inverter.In the first, the current situation and development trends of the inverters are presented in the paper. Following is the analyses of hardware of the inverter suiting for digital control based on digital signal processor TMS320F2812 and the intelligent power module(IPM); the basic theory of space vector pulse width modulation (SVPWM) is introduced, five specific SVPWM modes of implementation are educed detailedly, following by the comparison which shows the advantages and disadvantages of different patterns, an optimization mode is got which is used in this project, and the software is designed based on SVPWM control pattern; the basic theory of Q format is presented, variable Q format is adopted during the procedure for the calculation which improves the operation of the system data speed and precision, achieving the targeted processor for high-performance floating-point operation in the fixed-point DSP; the error sources and effects of the on-chip analog-to-digital conversion module(ADC) are discussed in detail, methods to reduce the error are studied, and a software method is used to correct the conversion results real-timely, raising the analog-to-digital conversion accuracy. The study is an instructive attempt and exploration of the intelligent control of inverter development, based on references to a lot of information and the latest technology on inverter. Through testing and debugging, the design of software control system studied in the paper is proved to be feasible.