DocumentCode :
1769357
Title :
Autonomous tuning method for realizing optimal adaptive voltage positioning scheme
Author :
Chih-Wei Liu ; Le-Ren Chang-Chien
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng-Kung Univ., Tainan, Taiwan
fYear :
2014
fDate :
1-5 June 2014
Firstpage :
2449
Lastpage :
2452
Abstract :
In this paper, an autonomous tuning method is proposed to realize optimal adaptive voltage positioning (AVP) scheme for the buck converter. The optimal AVP scheme can perform linearly fast transient response with less output capacitors compared to the traditional buck converter. The conventional wisdom of realizing the optimal AVP is to make the current sensing resistor (Ri) equal to the equivalent series resistor (Rc) of the output capacitor. However, such approach usually requires on-line system-identification algorithms or sensors that are complex and costly. Alternatively, this paper proposes a novel approach to implement the optimal AVP using a linear transition approximation (LTA) algorithm. Without using any parameter identification technique, the LTA algorithm only observes the output voltage response to adaptively adjust controller for realizing optimal linear transition during transient. The result of the proposed approach is very close to the effect of approximating Ri to Rc for an optimal AVP scheme. A buck converter using a FPGA controller that embeds the proposed algorithm is implemented. Experiment results show that the linear transient response is achieved in response to a 1-5 A step load change within 20 μs. A comparative result also shows that the optimal AVP performance is superior to the case without using the proposed algorithm.
Keywords :
adaptive control; approximation theory; field programmable gate arrays; optimal control; power convertors; transient response; tuning; voltage control; FPGA controller; LTA algorithm; autonomous tuning method; buck converter; current 1 A to 5 A; current sensing resistor; equivalent series resistor; linear transient response; linear transition approximation algorithm; linearly fast transient response; online system-identification algorithms; optimal AVP scheme; optimal adaptive voltage positioning scheme; optimal linear transition; output capacitor; output voltage response; step load change; time 20 mus; Approximation algorithms; Approximation methods; Capacitors; Power electronics; Transient analysis; Transient response; Tuning; Adaptive voltage positioning; Auto-tuning; Current estimator; Digital control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems (ISCAS), 2014 IEEE International Symposium on
Conference_Location :
Melbourne VIC
Print_ISBN :
978-1-4799-3431-7
Type :
conf
DOI :
10.1109/ISCAS.2014.6865668
Filename :
6865668
Link To Document :
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