Abstract
Current fed dual active bridge converters for photovoltaic generation may typically require a given leakage or extra inductance in order to provide proper control of the currents. Therefore, the many researches have been focused on the leakage inductance control of high frequency transformer to integrate an extra inductor. In this paper, an asymmetric winding arrangement to get the controlled leakage inductance for the high frequency transformer is proposed to improve the efficiency of the current fed dual active bridge converter. In order to accurate analysis, a coupled electromagnetic analysis model of transformer connected with high frequency switching circuit is used. A design optimization procedure for high efficiency is also presented using design analysis model, and it is verified by the experimental result.
Highlights
The current fed dual active bridge (CF-DAB) converter is a kind of high step-up converter for photovoltaic generation.[1,2,3]
The leakage inductance of transformer is controlled by adding a new flux path for leakage flux generation or increasing the distance between each winding.[4,5,6,7]
Self-inductance and the leakage inductance of each winding are controlled by the length of Gap A and B independently
Summary
The current fed dual active bridge (CF-DAB) converter is a kind of high step-up converter for photovoltaic generation.[1,2,3] CF-DAB converter may typically require a given leakage or extra inductance in order to provide proper control of the currents. Adding an inductor in series with the transformer to achieve the desired inductance increases overall size, cost and losses of the system. The leakage inductance of transformer is controlled by adding a new flux path for leakage flux generation or increasing the distance between each winding.[4,5,6,7] size and copper loss of transformer is increased as the extended winding length. The winding arrangement and core structure of high frequency transformer with controlled leakage inductance is proposed to improve efficiency of CF-DAB converter. The proposed design method controls leakage inductance through an effective cross-sectional area of core, number of turns and winding arrangement. By using this analysis method, design optimization for compact size and high efficiency is accomplished in this paper. The design results are verified by an experiment using the prototype of the transformer
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