Open AccessDesign of series resonant switched‐capacitor equaliser for series‐connected battery strings
Author(s) -
Liu Lizhou,
Xu Bin,
Xiong Liang,
Sun Wenbin,
Zhou Wei,
Li Yong,
Mai Ruikun,
He Zhengyou
Publication year - 2020
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
eISSN - 1752-1424
pISSN - 1752-1416
DOI - 10.1049/iet-rpg.2020.0375
Subject(s) - equaliser , capacitor , inrush current , switched capacitor , series (stratigraphy) , voltage , energy (signal processing) , battery (electricity) , electronic engineering , supercapacitor , series and parallel circuits , electrical engineering , computer science , engineering , control theory (sociology) , mathematics , capacitance , physics , electrode , transformer , paleontology , channel (broadcasting) , statistics , power (physics) , control (management) , quantum mechanics , artificial intelligence , biology
The traditional pure switched‐capacitor equaliser brings the large inrush current and low energy density. This study proposes a series of resonant switched‐capacitor (ReSC) voltage equaliser, which realises energy transferred directly from source cells to target cells by the series ReSC converter. The ReSC converter eliminates the inrush current and improves the capacitors’ energy density to increase the balancing speed. Meanwhile, all the switches are controlled by a pair of complementary PWM signals at a fixed operational frequency without voltage monitors. Both simulation and experiment are used to verify the system feasibility and theoretical analysis of the proposed circuit. In the same experimental condition, the proposed series resonant circuit reduces the inrush current. It improves the energy density of capacitors three times compared with the pure series switched‐capacitor equaliser.