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Open AccessArticle

A Novel High-Efficiency Double-Input Bidirectional DC/DC Converter for Battery Cell-Voltage Equalizer with Flyback Transformer

by Fengdong Shi 1,2 and Dawei Song 1,2,*
1
School of Electrical Engineering and Automation, Tiangong University, Tianjin 300387, China
2
Center for Engineering Internship and Training, Tiangong University, Tianjin 300387, China
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(12), 1426; https://doi.org/10.3390/electronics8121426
Received: 30 October 2019 / Revised: 24 November 2019 / Accepted: 27 November 2019 / Published: 29 November 2019
Large-scale battery cells are connected in series, which inevitably leads to a phenomenon that the cell voltage is unbalanced. With a conventional equalizer, it is challenging to maintain excellent characteristics in terms of its size, design cost, and equalization efficiency. In order to improve the defects in the above equalization circuit, a novel voltage equalization circuit is designed, which can work in two modes. A bidirectional direct current–direct current (DC–DC) equalization structure is adopted, which can quickly equalize two high or low-power batteries without using an external energy buffer. In order to verify the effectiveness of the proposed circuit, a 12-cell battery 2800-MAh battery string was applied for experimental verification. Computer monitoring (LabVIEW) was adopted in the whole system to intelligently adjust the energy imbalance of the battery pack. The experimental results showed excellent overall performance in terms of equalization was achieved through the newly proposed method. That is, the circuit equalization speed, design cost, and volume have a good balance performance.
Keywords: battery equalization; flyback transformer; topology battery equalization; flyback transformer; topology
MDPI and ACS Style

Shi, F.; Song, D. A Novel High-Efficiency Double-Input Bidirectional DC/DC Converter for Battery Cell-Voltage Equalizer with Flyback Transformer. Electronics 2019, 8, 1426.

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