带恒功率负载的DC/DC变换器阶跃响应过程分析  

Step Load Response Analysis of DC/DC Converter With Constant Power Load

作　　者：王建华[1] 张方华[1] 龚春英[1] 朱成花 

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 [2]通用电气中国研发中心,上海市浦东新区201203

出　　处：《中国电机工程学报》2008年第30期7-11,共5页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973 项目)(2007CB 210310);台达环境与教育基金会电力电子科教发展计划(DRE02006007)~~

摘　　要：由于恒功率负载负阻抗输入特性,Buck直直变换器带恒功率负载与阻性负载阶跃负载响应过程不同,且带恒功率负载时不能保证系统性能不受影响。并基于平均大信号模型,借助相平面法,针对恒功率负载以及阻性负载,详细分析了平均电流控制Buck变换器两种情形下的阶跃响应动态过程。分析表明,变换器带恒功率负载阶跃响应过程存在2类4种类型。通过限制阶跃负载所导致的电压跌落的大小可以确保变换器级联后阶跃负载动态性能不受影响。具体可以通过增大源变换器电感电流限流值及提高其电流环带宽实现。实验结果验证了理论分析的正确性。Due to negative impedance characteristic of constant power load （CPL）, buck converter with CPL and resistive load has different step load response processes, and system performance may be affected by CPL. With averaged large signal model and phase plane method, the step load response processes of averaged current control buck converter are analyzed in detail. The analysis indicates that there are two types and four processes of step load characteristics. When source converter is cascaded with CPL, step load performance remains unaffected by constraining its output voltage dip value. It could be implemented by larger inductor current limited value and higher current loop bandwidth. The experimental results verified the analysis .

关 键 词：平均大信号模型 相平面法 恒功率负载 阶跃负载响应 系统集成 

分 类 号：TM910[电气工程—电力电子与电力传动]