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根据L6599 的datasheet设置外部电路。 ...................................................................... 38
3.2 DC/DC恒流模块部分的研究与设计 ..................................................................39
3.2.1 DC/DC恒流的特性
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...................................................................................40
3.2.2 DC/DC恒流部分电感及其他参数设计 .......................................................40
第四章 开关电源EMI滤波器原理及参数设计 ........................................................... 42
4.1 EMI简述 ............................................................................................................... 42
4.2 输入端电磁骚扰的来源 ..................................................................................... 43
4.3 EMI滤波器设计原理 ........................................................................................... 43
4.4 EMI滤波器的工程应用设计方法 ....................................................................... 45
第五章 整机结构装配的研究与设计 .......................................................................... 49
5.1 整体结构设计 ..................................................................................................... 49
5.2 防水、防震及散热设计 ..................................................................................... 49
5.2.1 散热设计 ....................................................................................................... 49
5.2.2 防水、防震设计 ........................................................................................... 51
第六章 实验结果与分析 .............................................................................................. 54
6.1 LLC电路电压波形...............................................................................................54
6.1.1 谐振变换器原边功率MOSFET的ZVS情况 ............................................... 54
6.1.2 谐振变换器副边整流二极管的电压波形 .................................................. 56
6.2 输出电压纹波及恒流 ......................................................................................... 58
6.2.1 AC/DC输出电压纹波 ................................................................................... 58
6.2.2 恒流模块输出电流纹波、电压纹波 .......................................................... 59
6.2.3 输出多路分别恒流 ...................................................................................... 59
6.3 LED驱动电源的启动过程和掉电保持...............................................................60
6.3.1 AC/DC（PFC+LLC）启动过程 ..................................................................60
6.3.2 DC/DC模块启动过程 ...................................................................................61
6.3.3 掉电保持 ...................................................................................................... 61
6.4 空载波形及待机功率 ......................................................................................... 62
6.5 输入电压、输入电流和功率因数 ..................................................................... 64
6.6 整机效率及损耗分析 ......................................................................................... 65
6.6.1 不同输入电压不同负载下的效率曲线 ...................................................... 66
6.6.2 PFC电路的损耗分析 ....................................................................................66
6.6.3 LLC电路的损耗分析....................................................................................69
6.6.4 DC/DC恒流电路的损耗分析 .......................................................................71
6.7 实物图片 ............................................................................................................. 73
6.8 本章小结 ............................................................................................................. 74
