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1、word摘 要电力电子与开关电源技术因应用需求不断向前开展，新技术的出现又会使许多应用产品更新换代，还会开拓更多更新的应用领域。要求电子元件体积更小，耗能更低。开关电源作为电子设备中不可或缺的组成局部也在不断的改良，高频化、高效率、高可靠、低耗、低噪声、抗干扰和模块化等，成了开关电源的开展方向，这也标志着这些技术将不断地开展而变得越来越成熟和稳定，同时实现高效率用电和高品质用电的相互结合。脉宽调制器SG3525具有欠压锁定、系统故障关闭、软起动、延时PWM驱动等功能，因而得到广泛应用。本设计介绍了一种基于SG3525的半桥式开关电源变换器，对其各电路工作原理进展了分析，并设计了过流保护电路。为
2、了提高效率，辅助电源采用了UC3843为主控芯片的反激变换器。为了减低输入电磁干扰，输入端设置了EMI滤波电路。对各参数进展了计算，通过实物制作与调试证明了方案的可行性。该电源结构简单，思路清晰，运行稳定性好，有效降低了本钱。关键词半桥SG3525过流保护 / AbstractTechnology for power electronics and switching power supply is going aheadcontinuously in practiceThe emergence of new technology will make replacement inmany ap
3、plication products as well as open up more and more new fieldsAt the same timeponents are required to have the smaller volume and lower losses，as an importantparts of electronic devices power supply is getting some improvements，for high-frequency，for high efficiency，for high reliability，for low loss
4、es，for small noise，for anti-interference，for module and so onThese are being a development direction for power supply，which show that these technologies will bee more mature and stable，it will achieve thebinability between high-efficiency and high quality to use electric energy.The pulse width modul
5、ator SG3525 has been used in various areas for its functions such as locking for the lack of pressure, closing system fault, soft starting, delaying PWM drive and so on.This design introduces a half-bridge based on SG3525 switch powerconverte -r, the working principle of the circuit is analyzed and
6、designedover-current protec -tion circuit. In order to improve efficiency, auxiliary power for the main chip used UC3843 flyback converter. To reduce the input of electromagnetic interference,EMI input filter circuit is set. each parameter was calculated, through the producti -on and missioning phys
7、ical proof the feasibility of theproject.The power structure is simple, clear, running stability, and effectively reducing the cost of it.Key words: half-bridgeSG3525overcurrent protection目录摘要IAbstractII第1章绪论11.1 本课题研究的目的和意义11.2 国内外技术开展概况11.3 21世纪开关电源的开展展望21.4 本设计的主要内容和目标41.5 方案论证与总体设计41.5.1 方案论证41.
8、5.2 硬件总体结构设计6第2章半桥变换器拓扑分析72.1 半桥变换器工作原理72.2 半桥变换器的漏感问题8第3章控制芯片的介绍93.1 SG3525工作特性分析93.2 UC3843工作原理分析12第4章电路设计164.1 EMI滤波电路设计164.2 整流滤波电路设计184.3 半桥电路设计194.4 控制电路分析194.5 驱动电路与过电流保护电路原理分析204.5.1 驱动电路设计204.5.2 过电流保护电路分析214.6 辅助电源设计分析21第5章参数计算与主要元器件选择235.1 主电路拓扑参数计算235.1.1 半桥变压器计算235.1.2 电感的计算255.1.3 驱动变压
9、器和电流互感器285.2 辅助电源变压器计算285.3 其他电路参数计算315.4 主要芯片与元器件选择33第6章测试数据与分析346.1 本设计用到的仪器仪表346.2 电源主要技术参数测试346.2.1 电压调整率的测试346.2.2 电流调整率的测试346.2.3 电源效率的测试346.3 电源主要波形测试356.3.1 输出纹波噪声的波形356.3.2 主电路MOSFET的驱动波形366.3.3 辅助电源MOSFET的驱动波形376.3.4 主变压器原边绕组电压波形37结论38致谢39参考文献40附录41CONTENTSAbstract(chinese)IAbstractIIChapt
10、er 1 Introduction11.1 The purpose and significance of the research11.2 Overview of technology development at home and abroad11.3 Switching power supply 21 Prospects21.4 The design of the main contents and objectives41.5 Demonstration and overall design of the program41.5.1 Demonstration program41.5.
11、2 Hardware Architecture Design6Chapter 2 Analysis of half-bridge converter topology72.1 Half-bridge converter works72.2 Leakage problem of half-bridge converter8Chapter 3 Control the introduction of chip93.1 Analysis of work SG352593.2 UC3843 Work Analysis12Chapter 4 Circuit Design164.1 EMI filter c
12、ircuit design164.2 Rectifier filter circuit design184.3 Half-bridge circuit design194.4 Control Circuit Analysis194.5 Drive circuit and over current protection circuit analysis204.5.1 Driving circuit204.5.2 Analysis of over-current protection circuit214.6 Auxiliary power supply design and analysis21
13、Chapter 5 Parameter calculation and major ponent selection235.1 Parameter calculation of the main circuit topology235.1.1 Calculation of half-bridge transformer235.1.2 Calculation of Inductance255.1.3 Drive and current transformers285.2 Calculation of auxiliary power transformer285.3 Other circuit p
14、arameter calculation315.4 The main chip and ponent selection33Chapter 6 Test data and analysis346.1 The design of instrumentation used346.2 The main technical parameters of the test power346.2.1 Voltage Regulation Testing346.2.2 Current regulation test346.2.3 Power Efficiency test346.3 The main wave
15、 power test356.3.1 Output ripple and noise waveforms356.3.2 Driven MOSFET power circuit waveform366.3.3 Auxiliary power MOSFET driving waveform376.3.4 Main transformer primary winding voltage waveform37Conclusions38Acknowledgments39References40Appendix41第1章 绪论本课题研究的目的和意义电源是向电子设备提供功率的装置，也称电源供给器。随着电子技术的开展，电子系统的应用领域越来越广泛，我们的衣食住行离不开电源，科学研究、工农业生产、办公学习、文化娱乐、交通、国防建设、教育、环境保护、宇宙探索等等，哪一样也少不了电源。而电子设备的小型化和低本钱化使电源以轻、薄、小和高效率为开展方向。传统的晶体管串联调整稳压电源，是连续控制的线性稳压电源，这种传统稳压技术比拟成熟。并且已有大量集成化的线性稳压电源模块，具有稳定性好、输出纹波电压小、使用可靠等特点。但调整管工
