CLC number: TM923.61
On-line Access: 2017-03-10
Received: 2016-01-20
Revision Accepted: 2016-11-10
Crosschecked: 2017-02-21
Cited: 0
Clicked: 6799
Hui-pin Lin, Xiao-guang Jin, Liang Xie, Jin Hu, Zheng-yu Lu. A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range[J]. Frontiers of Information Technology & Electronic Engineering, 2017, 18(3): 410-422.
@article{title="A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range",
author="Hui-pin Lin, Xiao-guang Jin, Liang Xie, Jin Hu, Zheng-yu Lu",
journal="Frontiers of Information Technology & Electronic Engineering",
volume="18",
number="3",
pages="410-422",
year="2017",
publisher="Zhejiang University Press & Springer",
doi="10.1631/FITEE.1600029"
}
%0 Journal Article
%T A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range
%A Hui-pin Lin
%A Xiao-guang Jin
%A Liang Xie
%A Jin Hu
%A Zheng-yu Lu
%J Frontiers of Information Technology & Electronic Engineering
%V 18
%N 3
%P 410-422
%@ 2095-9184
%D 2017
%I Zhejiang University Press & Springer
%DOI 10.1631/FITEE.1600029
TY - JOUR
T1 - A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range
A1 - Hui-pin Lin
A1 - Xiao-guang Jin
A1 - Liang Xie
A1 - Jin Hu
A1 - Zheng-yu Lu
J0 - Frontiers of Information Technology & Electronic Engineering
VL - 18
IS - 3
SP - 410
EP - 422
%@ 2095-9184
Y1 - 2017
PB - Zhejiang University Press & Springer
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DOI - 10.1631/FITEE.1600029
Abstract: This paper proposes a new variable-mode control strategy that is applicable for LLC resonant converters operating in a wide input voltage range. This control strategy incorporates advantages from full-bridge LLC resonant converters, half-bridge LLC resonant converters, variable-frequency control mode, and phase-shift control mode. Under this control strategy, different input voltages determine the different operating modes of the circuit. When the input voltage is very low, it works in a full-bridge circuit and variable frequency mode (FB_VF mode). When the input voltage rises to a certain level, it shifts to a full-bridge circuit and phase-shifting control mode (FB_PS mode). When the input voltage further increases, it shifts into a half-bridge circuit and variable frequency mode (HB_VF mode). Such shifts are enabled by the digital signal processor (DSP), which means that no auxiliary circuit is needed, just a modification of the software. From light load to heavy load, the primary MOSFET for the LLC resonant converter can realize zero-voltage switching (ZVS), and the secondary rectifier diode can realize zero-current switching (ZCS). With an LLC resonant converter prototype with a 300 W rated power and a 450 V output voltage, as well as a resonant converter with 20–120 V input voltage, the experiments verified the proposed control strategy. Experimental results showed that under this control strategy, the maximum converter efficiency reaches 95.7% and the range of the input voltage expands threefold.
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