DocumentCode :
3827549
Title :
Adaptive Tuning of Switched-Mode Power Supplies Operating in Discontinuous and Continuous Conduction Modes
Author :
Jeffrey Morroni;Luca Corradini;Regan Zane;Dragan Maksimovic
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Colorado at Boulder, Boulder, CO, USA
Volume :
24
Issue :
11
fYear :
2009
Firstpage :
2603
Lastpage :
2611
Abstract :
This paper presents an approach to adaptive tuning of voltage-mode digital controllers for switched-mode power supplies in the presence of large signal changes from discontinuous conduction mode (DCM) to continuous conduction mode (CCM) and vice versa. The approach is capable of maintaining a high-performance control loop without the stability issues related to DCM-to-CCM mode transitions. The adaptive tuner, modeled as a multiple-input-multiple-output (MIMO) controller, is designed to continuously adjust the parameters of a PID compensator such that crossover frequency and phase margin measured by the digital controller match desired values. A simplified design procedure for the adaptive tuning system is proposed that reduces the small-signal MIMO design into two independent single-input, single-output control loops. Simulation results are given showing that despite wide uncertainty in the power stage, the adaptive tuning system still converges to the desired stability margins. Experimental results are given using an 11- to 5-V, 45-W, DCM/CCM buck converter as a test bed.
Keywords :
"Switched-mode power supply","Programmable control","Adaptive control","MIMO","Digital control","Stability","Adaptive systems","Voltage control","Tuners","Power system modeling"
Journal_Title :
IEEE Transactions on Power Electronics
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2009.2029334
Filename :
5204160
Link To Document :
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