《高频开关电源的设计与制作》-毕业论文.doc

摘要 PAGE IV w 高频开关电源的设计与制作 洛阳理工学院 电气工程与自动化系 摘 要 本文首先针对所需要的高频高压开关电源的要求，对高频高压开关电压的工作原理进行分析，选用适合的开关变换器、控制方式和功率MOSFET。其次，根据系统主电路的结构，设计出系统的各单元电路。最后，对所设计的系统进行安装调试，经过多次的反复试验，达到了各项设计指标的要求，并提出了系统的抗干扰措施，设计出一款全新系统结构的高频高压开关电源。 该系统以MOSFET作为功率开关器件，构成桥式Buck开关变换器。采用脉宽调制(PWM)技术，PWM控制信号由集成控制器SG3525产生，输出实时采样电压反馈信号，以控制输出电压的变化，控制电路和主电路之间通过光电耦合器进行隔离。系统还设计了软启动和过流保护电路。通过实验证明该系统能安全、可靠运行，达到了设计要求。 关键词：高频开关电源；变换器；SG3525；过流保护 High-frequency switching power supply design and production ABSTRACT This paper has analyzed the development and the present situation of the domestic and foreign switching power supply of high frequency and high—voltage，has studied the high frequency and high voltage switch power supply’s basic principle and the application．The paper designs the new system structure of the high frequency and high voltage switch power supply for the small and medium enterprise to govern waste gas and the dust． This system takes the power switch component by power MOSFET to constitute bridge-type Buck switch converter and uses the pulse-duration modulation(PWM) technology．The SG3525 produces the PWM control signal，the output signal of real—time sampling voltage feedback controls the change of output voltage，Between the control circuit and the main circuit carries on the isolation through the electro-optical coupler．We have designed the soft start and the overflow protection circuit．Through the experiment we have proved that this system is safe and reliable and it has achieved the design requirements． KEY WORDS: High frequency switching power source；Converter；SG3525；The overflow protection circuit 前言 目　录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc295417408 前　言 PAGEREF _Toc295417408 \h 1 HYPERLINK \l _Toc295417409 第1章 绪论 PAGEREF _Toc295417409 \h 2 HYPERLINK \l _Toc295417410 1.1 开关电源技术的发展方向 PAGEREF _Toc295417410 \h 2 HYPERLINK \l _Toc295417411 1.2 课题简介及课题意义 PAGEREF _Toc295417411 \h 4 HYPERLINK \l _Toc295417412 1.2.1 开关电源国内外发展趋势 PAGEREF _Toc295417412 \h 4 HYPERLINK \l _Toc295417413 1.