led照明用恒流电源变换器设计

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1、LED照明用恒流电源变换器设计目录1绪论·····························································11.1照明领域的发展历史············································11.2LED照明的原理及其优点·······································11.3LED电气特性和驱动方案·······································21.4LED的应用现状和前景························

2、·················32开关电源原理······················································52.1降压型开关电源变换器(Buck)···································52.24开关调制方式··················································72.2.1脉宽调制（PWM：PulseWidthModulation）···················82.3控制方式·····························

3、·························82.3.1电压控制模式·············································82.3.2电流控制模式·············································93LED驱动电路的结构·············································113.1LED驱动电路的结构及简述·····································113.2PWM发生器的控制逻辑····················

4、····················133.3工作状态描述·················································143.3.1启动阶段状态············································143.3.2稳定工作状态4············································143.3.3自动调节工作状态········································154子模块的分析与设计·························

5、······················164.1RC振荡器···················································164.1.1典型的RC振荡电路·····································164.1.2高精度RC振荡电路·····································174.2基准电压源···················································184.2.1带隙基准的原理·······················

6、···················184.2.2启动电路················································204.3放大器·······················································224.3.1运算放大器4··············································224.3.2缓冲放大器··············································244闽南理工毕业设计4.3.3GM误差放大器······

7、····································254.4比较器·······················································284.4.1普通比较器··············································284.4.2迟滞比较器··············································294.5保护电路·····················································3