正激式光耦隔离DC/DC变换器小信号分析与控制设计  

Small Signal Analysis and Control Design of Forward Optical Coupled Isolated DC/DC Converter

作　　者：鲁晓进 陈家海 贺啟峰 黄国良 LU Xiao-jin;CHEN Jia-hai;HE qi-feng;HUANG Guo-liang(No.43 Research Institute of CETC,Hefei 230088,China)

机构地区：[1]中国电子科技集团公司第四十三研究所,合肥230088

出　　处：《混合微电子技术》2020年第2期33-39,69,共8页Hybrid Microelectronics Technology

摘　　要：光电耦合广泛用于隔离式变换器,其作用是将反馈信号从次级传输到初级。在大多数变换器中,反馈放大器直接接输出,增加了额外环路,应在控制设计中考虑。本文比较了两种环路增益,其对应于在不同位置断开时的反馈环路增益。分析了这些环路增益在不同设计参数条件下的结果,讨论了TL431电压基准和光耦组合时的动态限制。最后设计一款电路对理论进行验证。Optical couplers are widely used in isolated power supplies to transfer the feedback signal from the secondary to the primary side.In most converters,the feedback amplifier is directly connected to the output,and additional loops are added,which should be considered in the control design.In this paper,two kinds of loop gain are compared,which correspond to the feedback loop gain when the circuit is disconnected at different positions.The results of these loop gains under different design parameters are analyzed,and the dynamic limits of the combination of TL431 voltage reference and optocoupler are discussed.Finally,a circuit is designed to verify the theory.

关 键 词：小信号 稳定性 光耦隔离 

分 类 号：TM46[电气工程—电器]