LED驱动器的反馈控制闭环电路分析  

LED Driver Circuit of Control Closed Loop Analysis

作　　者：毛竹 Mao Zhu(Current Lighting(Shanghai)Co.,Ltd,Shanghai 201203,China)

机构地区：[1]卡任特照明(上海)有限公司,上海201203

出　　处：《信息化研究》2024年第2期74-78,共5页INFORMATIZATION RESEARCH

摘　　要：本文介绍以电流反馈的半桥开关控制驱动LED的实用电路。以半桥驱动作为主电路并用变压器作为隔离电路,同时以电阻作为负载LED的电流检测传感器以及放大器、光耦隔离作为负反馈回路。推导出每个子电路的传递函数,把所有子电路的传递函数集合成幅频特性和相频特性的表达式,利用MathCAD画出幅频特性和相频特性的波特图。通过调整电路元器件的参数,最终满足波特图稳定裕度判定方法来确定负反馈环路系统的稳定性。The article introduces a practical circuit for drive LED using half-bridge switch control with current feedback.A half-bridge driver is used as the main circuit and a transformer is used as an isolation circuit.The resistor is used as the current detection sensor of the LED load,with amplifier and opt coupler isolation as a negative feedback loop.The transfer function set of all sub circuits is derived and synthesized into expressions for amplitude frequency characteristics and phase frequency characteristics.MathCAD is used to draw Bode plots of amplitude-frequency characteristics and phase-frequency characteristics.By adjusting the parameters of circuit components,the Bode plot stability margin determination method is finally satisfaction.

关 键 词：半桥控制 负反馈环路 幅频和相频特性 MATHCAD 波特图 稳定裕度 

分 类 号：TM923[电气工程—电力电子与电力传动]