Observer-Based Control of LLC DC/DC Resonant Converter Using Extended Describing Functions

This paper presents theoretical and practical results about dynamic analysis, frequency response, and control of a LLC resonant dc/dc converter operating under wide input voltage and load variations. A nonlinear model for the LLC resonant converter was developed using the extended describing functio...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2015-10, Vol.30 (10), p.5881-5891
Main Authors: Buccella, Concettina, Cecati, Carlo, Latafat, Hamed, Pepe, Pierdomenico, Razi, Kaveh
Format: Article
Language:English
Subjects:
Approximation methods
Controllers
DC/DC Power Conversion
Digital Control
Electric currents
Electrical equipment
Experiments
Extended Describing Functions
Load
Mathematical model
Nonlinear Systems
Observers
Renewable Energy Systems
Resonant frequency
Resonant Power Conversion
State Feedback
Steady-state
Switching frequency
Voltage control
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Summary:This paper presents theoretical and practical results about dynamic analysis, frequency response, and control of a LLC resonant dc/dc converter operating under wide input voltage and load variations. A nonlinear model for the LLC resonant converter was developed using the extended describing function method; then, based on the derived model, a nonlinear observer-based controller was designed and implemented with a digital signal processor. Transient responses obtained under input voltage and output load variations show that the proposed controller is capable to stabilize the output effectively. Experimental results prove the superiority of the proposed observer-based controller over a conventional PID controller.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2014.2371137