Soft start-up for high frequency LLC resonant converter with optimal trajectory control

Author

Chao Fei ; Lee, Fred C. ; Qiang Li

Author_Institution

Center for Power Electron. Syst., Virginia Tech, Blacksburg, VA, USA

fYear

2015

fDate

15-19 March 2015

Firstpage

609

Lastpage

615

Abstract

This paper investigates the soft start-up for high frequency LLC resonant converter with optimal trajectory control. Two methods are proposed to realize soft start-up for high frequency LLC converter by commercial low-cost microcontrollers (MCU). Both methods can achieve soft start-up with minimum stress and optimal energy delivery. One method is mixed-signal implementation by sensing resonant tank to minimize the digital delay. Another method is digital implementation with look-up table. Experimental results are demonstrated on 500kHz 1kW 400V/12V LLC converter.

Keywords

control engineering computing; microcontrollers; optimal control; power engineering computing; resonant power convertors; table lookup; trajectory control; commercial low-cost microcontrollers; digital delay minimization; frequency 500 kHz; high frequency LLC resonant converter; look-up table; minimum stress; mixed-signal implementation; optimal energy delivery; optimal trajectory control; power 1 kW; resonant tank sensing; soft start-up; voltage 12 V; voltage 400 V; Delays; Resonant frequency; Stress; Switches; Switching frequency; Trajectory; Video recording; LLC resonant converter; digital control; optimal trajectory control; soft start-up;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2015 IEEE

Conference_Location

Charlotte, NC

Type

conf

DOI

10.1109/APEC.2015.7104412

Filename

7104412