单相有源功率因数校正电路设计与实现本科论文 .doc

摘要 本文在分析造成电网谐波污染原因的基础上，根据设计指标提出的220V交流输入，直流电压400V /200W的输出要求，设计了单相有源功率因数校正电路。该电路由功率变换电路、控制电路和辅助电源电路组成。通过对升压式、降压式、升降压式和反激式拓扑的工作原理进行分析比较，选取升压拓扑作为功率变换电路，以保证较高的电源效率和功率因数；控制电路选取具有电压反馈和电流反馈的双反馈环集成芯片UC3854，以保证稳定的输出电压和与输入电压同相位、正弦化的输入电流波形；辅助电源电路采用磁集成技术，将电感和变压器集中在一个磁芯设计，达到了减少成本、缩小体积的目的。经测试，在220V交流输入的条件下，本文设计的电路可提供400V直流电压、200W功率输出，输入电流和电压相位相同，谐波失真率低，且功率因数在0.95以上。长时间工作后，输出电压和输入电流保持稳定，器件温升不超过50℃，满足设计指标要求，实现了功率因数校正的目的。 关键词 功率因数 Boost 乘法器 UC3854  Abstract This paper analyses the reasons of harmonic pollution. According to the design requirements of the 200W output power, output 400V DC and 220V AC input requirements, design a single-phase active power factor correction circuit. The circuit consists of power conversion circuit, control circuit and auxiliary power circuit. By analyzing and comparing the work principles of the boost, buck, buck-boost and flyback topology, we choose the boost circuit topology. In order to guarantee the power efficiency and high power factor, control circuit selects the integrated chip UC3854 with double feedback loops of the voltage feedback and current feedback in order to guarantee a stable output voltage and sinusoidal input current waveform that phase with the input voltage. Auxiliary power supply circuit adopts the technology of integrated magnetic. Inductor and transformer focus on a core design, reducing the cost and volume . After testing, with the 220V AC input condition, this design can provide 400V DC voltage, 200W power output, input current and voltage phase same, low distortion rate of harmonic, and the power factor above 0.95. After long time work, the output voltage and input current are stable, and the temperature rise of devices is below 50 ℃, meeting the requirements of design and the purposes of power factor correction. Keywords: Power Factor; Boost; Multiplier; UC3854目录 1 绪论 1 1.1 课题研究的背景和意义 1 1.2 开关电源的功率因数校正 1 1.3 本课题研究内容 4 2 单相有源功率因数校正电路方案选择 5 2.1 单相有源功率因数校正电路总体结构 5 2.2 单相有源功率因数校正电路拓扑选择与比较 6 2.3连续模式和不连续模式下Boost电路对比 8 3 功率