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- Title
A Cost-Effective Passive/Active Hybrid Equalizer Circuit Design.
- Authors
Sun, Chein-Chung; Chou, Chun-Hung; Lin, Yu-Liang; Huang, Yu-Hua
- Abstract
This paper proposes a novel hybrid equalizer circuit (HEC) for a battery management system (BMS) to implement the passive HEC (P-HEC), active HEC (A-HEC), or active/passive (AP-HEC) with the same equalizer circuit architecture. The advantages of an HEC are that it is simple, cost-effective, highly energy efficient, and fail safe. The P-HEC can further use a cooling fan or heater instead of a conventional resistor as a power dissipation element to convert the energy of the waste heat generated by the resistor to adjust the battery temperature. Even if the P-HEC uses the resistor to consume energy as in conventional methods, the P-HEC still dramatically improves the component lifetime and reliability of the BMS because the waste heat generated by the equalizer resistor is outside of the BMS board. Three significant advantages of an A-HEC are its (1) low cost, (2) small volume, and (3) higher energy efficiency than the conventional active equalizer circuits (AECs). In the HEC design, the MOSFETs of the switch array do not need high-speed switching to transfer energy as conventional AECs with DC/DC converter architecture because the A-HEC uses an isolated battery charger to charge the string cell. Therefore, the switch array is equal to a cell selector with a simple ON/OFF function. In summary, the HEC provides a small volume, cost-effective, high efficiency, and fail-safe equalizer circuit design to satisfy cell balancing demands for all kinds of electric vehicles (EVs) and energy storage systems (ESSs).
- Subjects
HYBRID integrated circuits; BATTERY management systems; ENERGY storage; ENERGY consumption; INTERSYMBOL interference; WASTE heat; BATTERY chargers
- Publication
Energies (19961073), 2022, Vol 15, Issue 6, p2000
- ISSN
1996-1073
- Publication type
Article
- DOI
10.3390/en15062000