The Research And Design Of Low Power UPS Based On DSP

With the development of information technology, online UPS is widely used in bank, military, hospital and so on, which puts forward higher requirements to UPS: fast dynamic response, high stability precision. At the same time, complete network function is also added. Obviously, realization of these functions needs digital technology. And salable, high performance digital signal processor (DSP) provides good hardware platform for digital UPS.The low power UPS designed in this paper is a digital UPS based on DSP. By analysis of the technology performance and comparison of topology structure, the main topology structure was decided, and the total principle chart based on TMS320LF2407A was also designed.Inverter control technology is the pivotal technology for UPS. In order to improve the output waveform of inverter, this paper presented a deadbeat controller algorithm with repetitive controller, the deadbeat controller used for improving dynamic response, the repetitive controller used for improving stability response. The results of Matlab simulation showed that the system achieves good output waveform under linear loads or periodic non-linear loads.Real time requirement is necessary for digital control algorithm of UPS inverter, but general micro controller can't reach it. High speed DSP with complete functions cannot only meet the real time requirement, but also simplify hardware circuit and improve system stability. In this paper, the total system control circuit based on TMS320LF2407A was designed. Also, by use of EDA technology, address-encoding circuit, control logic circuit, keyboard scanning circuit and LCD interface were realized with complex programmable logic device, so the assistant hardware circuit was more simplified. As to software design, deadbeat control algorithm with repetitive controller based on DSP was realized, RS-485 communication program and graph LCD menu interface were also designed. At last, the debugging of software had proved that hardware circuit could work stably, system control software could run normally, and other control functions could reach the requirements.