【作者】 周伟成；

【导师】 马皓；

【作者基本信息】 浙江大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 负载的多样化，特别是负载功率的多变性，以及人们对设备成本投入的最低化和阶段化，需要适用面更广，稳定性更高，还需要具备冗余性和可扩容性的电源与之相适应。这些都对传统的集中式电源提出了挑战，随着模块化分布式电源的技术发展，模块电源系统已成为现在和未来电源的发展趋势。本文以220V交流输入，42V—58V直流输出的AC／DC型模块电源单元为研究对象，选用PFC+LLC谐振回路为主电路拓扑。首先介绍了PFC主电路和控制芯片，给出主要参数的设计，并介绍PFC电路的保护和延时电路；然后分析LLC谐振变换器的工作原理，讨论LLC谐振变换器的主要特性，给出主要参数的设计，并介绍了LLC谐振变换器的控制方案和控制芯片，再次介绍了均流控制方法，重点研究分析了最大电流均流法和限流最大电流均流控制，提出了非选择性共同控制模式和选择性控制模式两种均流控制方案。最后设计制作220V交流输入，输出功率3kW的模块电源，并进行了不同谐振频率(40kHz与100kHz)以及不同电路布局下的对比试验研究，以谐振频率为100kHz的模块电源为例，进行了并机均流试验研究，给出了试验波形和结果。通过对试验结果的分析，验证了设计的可行性。最后分析了不足之处以及今后可能的改进方向。更多还原

【Abstract】 The power supply with redundancy, which has larger capacity of output, more stability and more extensive application, should be suitable for the diversification of varied load, and minimum cost. It’s a challenge to classical concentrated power source, instead, technologies of distributed power source appear and develop, which become a trend of power supply developing now and in future.This paper focuses on a 220V ac input and 42V-58V dc output -modularize power supply, choosing PFC+LLC resonant circuit as main topology. PFC main circuit and controlling IC are discussed firstly, also, giving major parameters’ design. Protecting circuit and delay recover circuit are discussed too. Then, operation principle of LLC resonant circuit is introduced, including main characteristic of LLC resonant, major parameters’ design, controlling method and controlling IC. After, this paper also discusses current sharing method, especially maximal current sharing and output limited maximal current sharing. Finally, a modularize power supply with 220V ac input and 3kW output power is completed, two compared experiments with different resonant frequency and different layout design have been done. More, two modularize power supplies with same parameters and layout design are completed for parallel operation experiment. The result of experiment showed feasibility and deficiency of modularize power supply design, and possible improving direction.更多还原