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摘要：能源在每个国家中的地位都是举足轻重，关乎兴衰，尤其是中国这样的发展中国家和能源消费大国，为了取得中华民族的伟大复兴和社会主义现代化建设事业的伟大胜利，更是将能源问题放在国家发展的战略高度。开关电源具有滤波效率高、功率密度和能量转化比高、稳压范围宽等优点。它正在逐步取代传统的线性电源。但开关电源中的电解电容限制了其使用寿命（与LED寿命不匹配），制约了开关电源的应用范围（特别是LED照明驱动领域）。本文研发一种无电解电容开关电源。本论文提出用一种基于双线性变换法的无损耗电阻电路替代电解电容，并实现DC/DC变换功能。无电解电容开关电源通过保持电压变化量与无损耗电阻变化量是一个固定比例，从而保证输出电压平滑性。无损耗电阻器通过分压来实现DC/DC变换。由于无损耗电阻其自身损耗非常小，不会对无电解电容开电源的效率造成很大的影响。同时，本文给出了无损耗电阻器的设计和确定其阻值的方法。本文完成一台30W原理样机进行实验验证。实验结果表明本文所提出的方法是可行的。5436
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关键词：开关电源；无损耗电阻器；电压/频率转换；LED
Research and development of Electrolytic Capacitor-less switching power supply
Abstract：In every country, the status of energy is very important, so rational utilization of energy is a very important subject, especially for our country, such a big country of energy consumption and a developing country. China placed the energy issue on a strategic height of national development in order to achieve the great rejuvenation of the Chinese nation and the great victory of the socialist modernization drive. Switching power supply has high filtration efficiency, high power density and energy conversion ratio, wide voltage range, etc. It is gradually replacing traditional linear power supply. However, electrolytic capacitor of switch power supply limits its service life (Its life does not agree with LED’s one), and restrict the application range of switching power supply (especially in the field of LED lighting driver). This thesis is dedicated to the design of an electrolytic capacitor-less switching power supply. In this thesis, lossless resistor (LLR) based on bilinear transformation is replaced electrolytic capacitor. Additionally, it substitutes for the DC-DC converter. Switching power supply without electrolytic capacitor maintains a fixed ratio between variation of rectified voltage and variation of resistance of LLR to ensure smoothness of output voltage. Also, LLR play a pider resistor to reduce direct voltage or charge direct voltage. Power loss of LLR is too small to considerably lower power efficiency. Furthermore, this thesis introduces LLR design method by bilinear transformation, and discusses the realization of LLR. A 30W prototype has been built and tested in the lab, and the experimental results verify the LLR can replace electrolytic capacitor.
Key Words: witching power supply; lossless resistor; V-F converter; LED.
目 录
1绪论 1
1.1引言 1
1.2开关电源的国内外研究现状 2
1.3无电解电容开关电源设计面临的挑战 2
1.4本文的主要内容和研究意义 3
2开关电源 5
2.1引言 5
2.2开关电源的原理和结构 5
2.2.1 开关电源的基本原理 5
2.2.2 开关电源的基本构成 7
2.2.3 开关电源的常见拓扑结构 8
2.2.4 开关电源的控制模式 10
2.2.5 开关电源与恒流技术 12
2.3电解电容与开关电源的关系 12
2.3.1 开关电源中电解电容的作用和功能 12