单相AC—DC变换电路设计研讨.doc

单相AC-DC变换电路设计报告 摘要：有源功率因数校正(Active Power Factor Correction ,简称APFC)技术因能提高电力电子装置网侧功率因数,降低线路损耗,节约能源,减少电网谐波污染,提高电网供电质量等优点,在许多行业中得到广泛的应用。Abstract: Active power factor correction （APFC）technology for increasing power electronic device power factor, decrease line loss, save energy, reduce harmonic pollution, improving the quality of power supply and other advantages, is widely applied in many industries. This system uses the active power factor correction (APFC) method, to control the input current boost circuit of main circuit topology of BOOST, enables it to achieve the same frequency and phase with the input voltage difference is close to 0, power factor is close to 1, in order to achieve high power factor power. The system adopts UCC28019 as the control chip, and improve the power factor of power supply, with good voltage regulation and load regulation, the input current waveform distortion is less than 1%, power factor greater than 0.98, the efficiency is close to 93.9%, and the use of MCU to monitor the whole system, capable of measuring the output power, power factor and can set the output voltage and other functions. System design from the layout and filtering to eliminate electromagnetic interference, can realize the measurement and Chinese output voltage, current, power factor display function. Keyword：APFC,AC-DC conversion,UCC28019,boost circuit. 1. 方案设计与论证 2 1.1总体方案设计与比较 2 1.2 PFC控制方法分析及实现方案 4 1.2.1 PFC控制方法分析 4 1.2.2实现方案 5 2. 理论分析 5 2.1提高效率的方法 5 2.2功率因素调整方法 5 2.3稳压控制方法 5 3. 电路设计与计算及程序设计 6 3.1主回路器件的选择及参数计算 6 3.2 PFC控制电路外围参数计算 7 3.3输出设定电路的设计 8 3.3.1输出过流保护电路的设计 8 3.3.2数字设定及显示电路设计 8 3.3.3外加电源及基准的设计 8 3.4软件设计 9 4. 测试方法与测试结果 9 5. 结论 11 附录一：参考文献 11 附录二：总电路图 12 附录三：程序 13 附录四：元器件清单 17 附录五：电路测试波形 18 1. 方案设计与论证 1.1总体方案设计与比较 方案1：采用UC3854控制的功率因数校正 该方案采用当前应用最为广泛的升压式Boost电路拓扑，一般情况下都采用电流连续型控制。UC3854N/ AN/BN系列是常用的控制芯片，利用它可以将PF提高到0.99以上，然而在实际中却常常存在如输出电压飘升、尖端失真`功率管击穿等问题。UC3854控制的功率因数校正电路图如图1所示。 图1：UC3854控制的功率因数校正电路图 方案2：采用通过MCU或DSP编程控制完成系统的功率因