摘要
从电网获取交流电经整流后为设备提供直流电是电力电子技术中应用极为广泛的一种整流方案，然而由这种整流方案设计的电路使输入电流产生严重的畸变，其谐波电流严重污染了电网，输入端功率因数大大下降。随着IEC1000-3-2等国际标准的颁布和强制执行，功率因数校正(PFC)技术已成为电力电子领域的一个研究热点。
本文在平均电流模式控制的有源功率因数校正技术的基础上，设计了一种控制电路基于数字信号处理器(DSP)、主电路采用Boost变换器拓扑结构的全数字单相功率因数校正器，用数字电路代替传统的模拟电路来实现对整个回路的控制，最终使得校正器具有输入功率因数接近于1、低电流谐波以及高转换效率的特性。
PFC系统的控制电路采用电流环与电压环双闭环控制结构，控制算法采用传统的PI算法。文中对PFC电路的小信号模型进行了研究，并建立了系统的简化平均小信号模型，在此基础上，以系统的动态特性和稳定性为设计指标，具体给出了双闭环系统中PI调节器的设计方法。此外，本文对电压与电流的采样算法
西安理工大学硕士学位论文
也进行了研究。
实验样机主要由主电路、控制电路和辅助电源电路等三部分组成。主电路来
用B。。St变换器拓扑结构；控制电路主要由核处理器ADSP、21065L、Al3转换器
和实现DPWM及地址解码功能的CPLD等器件组成；辅助电源电路为控制电路
中各器件提供工作电压。
软件系统由初始化模块、PI算法模块、软启动算法模块、采样算法模块、中
断子程序模块等几个可以实现独立功能的模块组成，这些功能模块在主程序的控
制连接下，实现了一个完整的系统。这种软件系统不仅使程序简洁、易读，而且
更便于系统的升级。
本文的设计思想与相关结论经仿真与实验得到验证。
The rectifier scheme that direct current supplying with power electronic equipment is obtained by alternating current being rectified is widely applied in power electronics field. However, the rectifying circuits result in input current distortion, input power factor greatly decrease. With promulgation and obliging actualization of IEC 1000-3-2 etc. international standards, Power Factor Correction (PFC) technique become a hotspot of research in power electronics field.
Based on average current mode, the paper introduce the design and implementation of a fully digital controlled single-phase boost power factor corrector with fast response . The control-loop circuit is realized using digital control and the corrector can tend to unity power factor, lower current harmonics and high transfer efficiency.
The double closed-loops framework is applied in the PFC control circuit and the PI algorithm is adopted as system' s control algorithm. The paper research small-signal model of PFC circuit and build the
simplified average-small-signal model of the system. The thesis develop design method of PI regulators which are applied in double closed-loops system. Furthermore, the sampling algorithm of votage and current variables is also analysed in this paper.
The prototype include three parts. The main circuit adopt Boost converter topology; the control circuit is made up of ADSP-21065L core processor, A/D converter and CPLD which realize the functions of Digital Pulse Width Modulation(DPWM) and address decoding; the auxiliary power supply afford work voltage of every device.
The software system consist of some software modules which realizing independent functions, such as initialization module, PI algorithm module, sampling algorithm module and interrupt module. Under connection of the main program, these modules realize an integrated system.
All design thoughts and theoretical results are verfied by experiments on prototype.
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