带磁放大器调整多路输出直–直变换器环路互扰  

Control-loop Interaction in Multi-output DC-DC Converter With Magamp Post-regulation

作　　者：王建华[1] 钱祝旭[1] 张方华[1] 龚春英[1] 

机构地区：[1]航空电源航空科技重点实验室(南京航空航天大学),江苏省南京市210016

出　　处：《中国电机工程学报》2010年第9期33-39,共7页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2007CB210303);台达环境与教育基金会<电力电子科教发展计划>项目(DRE02006007)~~

摘　　要：带磁放大器后级调整多路输出直–直变换器采用峰值电流控制时,若采样原边电流控制,则磁放大器回路会被引入不规则脉动电流,使得主环路与磁放大器环路相互耦合,环路的相互作用会导致主辅路输出电压振荡。建立磁放大器环路及系统级小信号模型,分析环路互扰现象的机理,指出环路互扰现象实质上是负载交叉调整率恶化时的另一种表达方式,并基于交错输出阻抗分析提出相应解决方案,即通过提高主环路外环开环增益或采用斜坡补偿方式,能够有效解决环路互扰现象。Issue related to control-loop interaction in a multi-output dc-dc converter with magamp post-regulators was discussed in this paper. The interaction occurs with peak current mode control using primary current sensed. Due to irregular pulse current from magmap circuitry, main loop and magamp control-loops are coupling, which even makes main and auxiliary outputs oscillate. Small signal models of magmap loop and whole system were derived, interaction mechanism was analyzed and it was revealed that control-loop interaction is another expression of worse cross regulation. Corresponding solutions were presented with cross output impedance analysis. And control-loop interaction could be settled with higher outer-loop gain of main circuit or slope compensation.

关 键 词：多路输出 磁放大器后级调整 环路互扰 交错输 出阻抗 峰值电流控制 斜坡补偿 

分 类 号：TM910[电气工程—电力电子与电力传动]