Method to control flux balancing of high-frequency transformers in dual active bridge dc–dc converters

The Journal of Engineering

Zitan Wang¹  Jianyun Chai² 

[1] Department of Electrical Engineering , Tsinghua University , Hai Dian, Beijing , People's Republic of China

关键词: steady-state dc bias;    flux density;    switching characteristics;    high-frequency transformers;    dual active bridge dc–dc converters;    nonideal behaviours;    duty ratios;    proportional integral controls;    generalised average model;    active flux-balancing control method;    dual active bridge converters;   

DOI  :  10.1049/joe.2018.8338

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

Due to non-ideal behaviours and switching characteristics, dc bias might be generated in the dual active bridge converters. It could be more serious in the high-frequency transformers because of small loop resistances. It could also restrict the range of operating flux density due to the threat of saturation. This study analyses the steady-state dc bias and divides it into two categories. Then an active flux-balancing control method is proposed to eliminate these dc biases. It uses separate proportional integral controls and adjusts duty ratios of both sides independently to achieve flux balance. A generalised average model is established to verify its dynamic performance and stability. Simulation and experimental verification on a laboratory prototype confirm the performance of this approach.

【 授权许可】

CC BY