毕业设计基于同步整流技术复合恒流源研究.doc

摘要 PWM 功率变换器经简单滤波后,其输出波形往往满足不了高稳定电源的要求。事实上,在某些对电源性能要求很高的场合,至今仍未能以小体积的开关电源取代,一直延用线性电源。线性电源的主要优点是稳定性好，主要缺点是效率较低。开关电源的效率高，但稳定性不如线性电源。因此，对稳定度要求较高的场合，线性稳压电源依然是首选，传统的线性稳压电源调整管工作在线性放大区，功率损耗较大，可见两种电源各有其优势及缺陷。 本课题所设计的基于开关线性复合恒流源是一种高精度低压差开关线性复合式稳压电源，其基本原理是将线性电路与开关电路的优势互补，在总体上提高电源系统的性能。并且通过PSPICE仿真结果图来说明了该恒流源源系统的可实现性。 关键词　高性能电源 高精度 开关-线性复合 仿真 Abstract PWM power converters by a simple filter, its output waveform is sensitive to the load type of change, parameter change and the impact of mutation load. Often can not meet the requirements of high performance power supply. In fact, in some very high performance requirements on the power situation has not yet been able to replace the small size of the switching power supply has been extended with a linear power supply. The main advantage of linear power supply is stable, the main drawback is low efficiency. High efficiency switching power supply, but is less stable than the linear power supply. Thus, stability requires high, linear regulated power supply is still the first, the traditional linear power supply Diaozheng operating in the linear amplification Ou Guan, power losses great, can see two kinds of power have their different advantages and defects . In this thesis based on switching linear composite current source is a high precision low dropout linear hybrid switching regulated power supply, the basic principle is that the linear circuit and switching circuit complementary, in general, to improve power system performance. PSPICE simulation results by the constant stream of clear plans for the system easy to realize. Keywords　 High-performance power Precision Simulation Switches - Linear Composite  目 录 摘要 I Abstract II 第1章 绪论 1 1.1 课题背景-电力电子技术的发展[1] 1 1.2课题研究内容-开关线性复合电源[2] 2 1.2.1 开关电源 2 1.2.2线性电源 4 1.2.3开关线性复合式功率变换技术(SLH)[3] 4 1.3选题意义 6 第2章 功率电路原理分析与设计 7 2.1系统原理分析与结构选择 7 2.2 常规BUCK电路与同步BUCK电路对比分析 7 2.2同步BUCK工作原理分析 10 2.3线性电源基本工作原理 14 2.4线性恒流部分PI调节器设计 16 2.5线性调整电路结构与仿真验证 19 2.6本章小结 22 第3章