The Research On The Digitized Control Technology Of ON-LINE UPS

With the development of the information and technology, UPS are widely used in banks, securities, military, medical car aviation etc. However, the adoption of simulative circuit in the traditional UPS power supply has caused some innate drawbacks, just like the circuit is easy to age and the output function is low. With the appearance of the high-capacity DSP controller, the all-digital-control to the UPS comes true . In the technologic sense, the employment of DSP can increase the stability and pure level of the UPS products output Voltage, together with its reliability. The digital controlling can also increase many function such as the transient state, steady state responsibility of UPS, which is beneficial for the products' optimization and promotion. Conform to the developing trend of UPS, this thesis makes a research on single phase ON-LINE UPS based on DSP digitalizing control technology.At the beginning of the thesis, it analyses and comprehends the main structure of nowadays UPS, then chooses a kind of DSP based systemic structure of single phase ON-LINE UPS. Followed by it, the controlling methods and strategies of all parts of UPS are systemically analyzed and compared. Fixed frequency delay loop current controlling method is taken to realize according to UPS power proofreading calculation is taken according to UPS Inverter controller.In the research of the Inverter controlling calculation, the systemic and complete analysis of the UPS Inverter system is carried out ; setting up UPS sine Inverter mathematical mode, analyzing the character of it, comparing the peculiarity between inductor current feedback and capacitor current feedback according to the feature of it; Choosing capacitor current feedback to make the system respond more quickly. Matlab emulate shows that this controlling strategy can get a good the transient state and the steady state effect of track of the reference of the sine wave under linearity load ,as well as nonlinearity load.On the basis of inverter controlling calculation, this thesis also explains the hardware components whose main controlling chip is DSPLF2407 and defines the software realizing way in terms of the hardware design of controlling system which gives all principle ideas to realize the UPS inverter controlling calculating software.In the last part, the thesis presents a overall description to the auxiliary power , UPS controlling protect system ,inverter driving circuit and so on and a detailed analysis of all the auxiliary circuits' construction function and working principal.