Robust digital control for an LLC current-resonant DC-DC converter

Author

Nishimura, Tomoya ; Adachi, Yuto ; Ohta, Yoshihiro ; Higuchi, Kohji ; Takegami, Eiji ; Tomioka, Satoshi ; Jirasereeamornkul, Kamon ; Chamnongthai, Kosin

Author_Institution

Dept. of Mech. Eng. & Intell. Syst., Univ. of Electro-Commun., Chofu, Japan

fYear

2012

fDate

16-18 May 2012

Firstpage

1

Lastpage

4

Abstract

If a pulse frequency, a load resistance of an LLC current-resonant DC-DC converter are changed, the dynamic characteristics is varied greatly, that is, the LLC current-resonant DC-DC converter has non-linear characteristics. In many applications of DC-DC converters, loads cannot be specified in advance, and they will be changed suddenly from no loads to full loads. A DC-DC converter system used a conventional single controller cannot be adapted to change dynamics and it occurs large output voltage variation. In this paper, a robust digital controller for suppress the change of step response characteristics and variations of output voltages in the load sudden changes is proposed. Experimental studies using a micro-processor for the controller demonstrate that this type of digital controller is effective to suppress the variations.

Keywords

DC-DC power convertors; digital control; microcontrollers; resonant power convertors; robust control; step response; LLC current-resonant DC-DC converter system; load resistance; microprocessor; nonlinear characteristics; pulse frequency; robust digital control; step response characteristics; Power electronics; Robust control; Robustness; Switches; Transfer functions; Voltage control; DC-DC converter; LLC current-resonant; approximate 2DOF; digital robust control; micro-processor;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2012 9th International Conference on

Conference_Location

Phetchaburi

Print_ISBN

978-1-4673-2026-9

Type

conf

DOI

10.1109/ECTICon.2012.6254168

Filename

6254168