Open AccessBi‐frequency control for LLC resonant converter with fast transient response
Author(s) -
Zhong Shu,
Xu Jianping,
Zhao Sheng,
Zhou Xiang
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2016.2638
Subject(s) - duty cycle , transient response , transient (computer programming) , resonant converter , voltage , control theory (sociology) , controller (irrigation) , automatic frequency control , pulse width modulation , engineering , electronic engineering , physics , converters , electrical engineering , control (management) , computer science , agronomy , artificial intelligence , biology , operating system
Bi‐frequency (BF) control for LLC resonant converter is proposed and studied. Compared with conventional voltage mode control of LLC resonant converter, which realises output voltage regulation by adjusting control pulse frequency cycle by cycle, BF control of LLC resonant converter realises its output voltage regulation by adjusting the combination of two preset control pulses with 50% duty ratio and different switching frequencies. BF controlled LLC resonant converter benefits from simple controller design and fast transient response. A 130 W prototype is presented to verify the analysis results of BF control method.