Open AccessSingle‐magnetic equaliser without any sensors for series‐connected battery strings
Author(s) -
Liu Fulin,
Zou Runmin,
Su Mei,
Sun Yao,
Liu Yonglu,
Li Xing,
Wang Hui,
Xu Guo
Publication year - 2019
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2019.0021
Subject(s) - equaliser , battery (electricity) , series (stratigraphy) , computer science , electrical engineering , engineering , biology , physics , paleontology , channel (broadcasting) , power (physics) , quantum mechanics
This study proposes an automatic cell‐to‐cell equaliser to balance the battery voltages in series‐connected battery strings. In the proposed equaliser, each cell needs only one MOSFET, and the adjacent cells share the transformer winding. The voltage balance is automatically realised by using a pair of complementary control signals with a fixed duty cycle. What's more, no sensing circuit is required. Consequently, the proposed equaliser is cost‐effective and easy‐to‐realise. The circuit topology and operating principles are firstly presented. Then the voltage balance analysis is given in detail. Moreover, a design guide is also given by considering four lithium‐ion cells. Finally, the validity of the proposed equaliser is verified by experimental results.