| With the wide application of computer and the development of internet, there is higher demand on power supply, and there is an inevitable trend in digital control of UPS. The performance of the online UPS is the best among all kinds of UPS, and it is widely used in many fields. With the development of digital control technology , Digital Signal Process has been brought into the control of UPS constantly. The circuit simplification and digitization of online UPS become possible.This thesis analyzes the boost power factor correction (Boost PFC) converter of the online UPS ,and gives the mathematical model of the main circuit. Then ,brings up the digital double-loop control strategy ,which is outer voltage loop and inner current loop .Then gives specific control program.The thesis also describes the circuit topology and specific design issues . then use the DSP TMS320LF2406A which is produced by Texas Instruments to be the main control chip of the system ,and design the software. The digital methods to generate the sine wave, the interruption and some important programs are all presented in detail ,and then gives specific software flowcharts.Finally, The thesis gives the waveforms of current and output dc voltage which are got with saber simulation . It is effective to adopt the double-loop control structure .The positive and negative output voltage can be regulated respectively and are stable with certain load. The input power factor is improved .So ,this control strategy is reasonable and effective .At last, some issues are analyzed which will be settled in the future. |
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