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http://dx.doi.org/10.6113/JPE.2016.16.5.1650

A Novel Compensator for Eliminating DC Magnetizing Current Bias in Hybrid Modulated Dual Active Bridge Converters  

Yao, Yunpeng (National ASIC System Engineering Research Center, Southeast University)
Xu, Shen (National ASIC System Engineering Research Center, Southeast University)
Sun, Weifeng (National ASIC System Engineering Research Center, Southeast University)
Lu, Shengli (National ASIC System Engineering Research Center, Southeast University)
Publication Information
Journal of Power Electronics / v.16, no.5, 2016 , pp. 1650-1660 More about this Journal
Abstract
This paper proposes a compensator to eliminate the DC bias of inductor current. This method utilizes an average-current sensing technique to detect the DC bias of inductor current. A small signal model of the DC bias compensation loop is derived. It is shown that the DC bias has a one-pole relationship with the duty cycle of the left side leading lag. By considering the pole produced by the dual active bridge (DAB) converter and the pole produced by the average-current sensing module, a one-pole-one-zero digital compensation method is given. By using this method, the DC bias is eliminated, and the stability of the compensation loop is ensured. The performance of the proposed compensator is verified with a 1.2-kW DAB converter prototype.
Keywords
DC bias; Dual active bridge converter; Efficiency;
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