摘要
搭建了基于数字控制的负载点(point of load,POL)变换器的硬件平台,分别用数字式再设计法和直接数字设计法,对数字控制器进行了分析和设计。根据系统的闭环模型图,利用伯德图分析法、离散频率响应法和根轨迹法,设计出数字控制器的各项参数,并对系统的剪切频率和相位裕度进行了比较。在实验平台上对这两种设计方法进行了验证,并对输出电压的稳态特性和动态响应做了比较分析。理论分析和实验结果表明,采用直接数字设计法可减小输出电压的动态调整率,改善系统的动态响应性能,更适合用于数字控制POL变换器的设计。
A hardware platform consisting of a point of load （POL） converter with a digital controller is built. The digital controller is analyzed and designed using digital redesign and direct digital approaches. The digital controller parameters are designed employing analytic methods for continuous and discrete systems, including the Bode graph method, discrete-time frequency method and root-locus method. The cross-over frequency and phase margin are compared. Then the digital redesign and direct digital approaches are verified by experimentation. The steady state performances and dynamic responses are analyzed comparatively. Theoretical analysis and experimental results suggest that using the direct digital approach lowers the output voltage adjustment rate and improves the dynamic response speed.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第2期121-125,共5页
Journal of Chongqing University
基金
重庆市自然科学基金资助项目(CSCT2006BB6210)
关键词
数字控制系统
数字信号处理
数字式再设计法
直接数字设计法
负载点
digital control systems
digital signal processing
digital redesign approach
direct digital approach
point of load
