Current-Limited Time-Optimal Response in Digitally Controlled DC-DC Converters

被引:55
|
作者
Corradini, Luca [1 ]
Babazadeh, Amir [1 ,2 ]
Bjeletic, Aleksandar [1 ]
Maksimovic, Dragan [1 ]
机构
[1] Univ Colorado, Colorado Power Elect Ctr, Boulder, CO 80309 USA
[2] Infineon Technol N Amer Inc, Torrance, CA 90505 USA
关键词
DC-DC converters; digital control; time-optimal control; SWITCHING SURFACE; BOUNDARY CONTROL;
D O I
10.1109/TPEL.2010.2049661
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper addresses the problem of time-optimal load-transient response in digitally controlled dc-dc buck converters incorporating an inductor current limitation. The concept of current-limited, time-optimal control (CL-TOC) is introduced and compared to the conventional unconstrained time-optimal solution. A fundamental tradeoff between maximum-allowed current overshoot and voltage recovery time is recognized and analytically formulated, thus providing the engineer with the necessary analytical tools for performance evaluation. Furthermore, the minimum number of switching actions required to handle a generic CL-TOC transient is determined, thus leading to the formulation of a minimum-switch CL-TOC concept. Two distinct approaches for implementing minimum-switch digital CL-TOC are then introduced. The first method extends a parameter-independent time-optimal control that has the advantage of achieving the time-optimal switching sequence without the need for a prior knowledge of the output filter LC parameters or input voltage. The second approach implements a near CL-TOC employing the switching-surface concept and defining the current limitation in the state space. Experimental results are provided to validate the theory and demonstrate the effectiveness of the approaches.
引用
收藏
页码:2869 / 2880
页数:12
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