Title :
Limit-Cycle Based Auto-Tuning System for Digitally Controlled Low-Power SMPS
Author :
Zhao, Zhenyu ; Li, Huawei ; Feizmohammadi, A. ; Prodic, A.
Author_Institution :
Dept. of ECE, Toronto Univ., Ont.
Abstract :
This paper presents a new method and system for the parameter extraction and dynamic auto-tuning of low power digitally controlled dc-dc switch-mode power supplies (SMPS). During a short-lasting test phase, SMPS parameters, such as output capacitance and load, are estimated by examining the amplitude and frequency of intentionally introduced limit cycle oscillations. Then, accordingly, the digital compensator of SMPS is automatically tuned to improve the output regulation and dynamic performance. The effectiveness of the method is demonstrated on an experimental 200 kHz, 12V-to-5 V, 10 W, digitally controlled buck converter
Keywords :
digital control; limit cycles; low-power electronics; switched mode power supplies; 10 W; 12 to 5 V; 200 kHz; auto-tuning system; dc-dc switch-mode power supplies; digital compensator; digitally controlled buck converter; limit cycle oscillations; Amplitude estimation; Automatic control; Capacitance; Control systems; Digital control; Frequency estimation; Limit-cycles; Parameter extraction; Switched-mode power supply; Testing;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2006. APEC '06. Twenty-First Annual IEEE
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-9547-6
DOI :
10.1109/APEC.2006.1620682
