Transformer winding coupled low-voltage side parallel self-current-sharing dual-active full-bridge converter

Through the design of transformer winding coupling, a low-voltage side parallel self-current homogenization dual active full-bridge converter is realized, which solves the current current sharing problem of medium and low-voltage side in the existing technology, reduces the system cost and volume, and is suitable for low-voltage and large current scenarios.

CN119727392APending Publication Date: 2025-03-28HUNAN UNIV OF TECH
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Patent Information

Application Number
CN202411898509.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In the case of low voltage and high current, the low voltage side circuit of the dual active full-bridge converter cannot meet the current stress magnitude requirements, and the parallel H-bridge module cannot achieve current equalization. It is necessary to add a current sensor and a sampling circuit to achieve current equalization, which increases the system cost and volume.

Method used

Through the transformer winding coupling, a low-voltage side parallel self-current-sharing dual active full-bridge converter is designed, and the low-voltage side current is automatically realized by using the coupling relationship of the transformer, without additional control, and the system cost is reduced.

Benefits of technology

Automatic current sharing of the low-voltage parallel circuit is realized, which reduces system costs and eliminates the impact of circuit parameters on system current sharing. It is suitable for low-voltage and large current scenarios and reduces the system volume.

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Abstract

The invention discloses a transformer winding coupled low-voltage side parallel self-current-sharing dual-active full-bridge converter. The transformer winding coupled low-voltage side parallel self-current-sharing dual-active full-bridge converter comprises two low-voltage side parallel switching circuits, two isolation transformers, a series inductor and a high-voltage side switching circuit, the first isolation type transformer T1 is provided with a primary winding and two identical secondary windings, namely a first primary winding Np1, a first secondary winding Ns11 and a second secondary winding Ns12; the second isolation type transformer T2 is provided with a primary winding and two identical secondary windings, namely a first primary winding Np2, a first secondary winding Ns21 and a second secondary winding Ns22; the first secondary winding Ns11 and the first secondary winding Ns21 are connected in series, and the second secondary winding Ns12 and the second secondary winding Ns22 are connected in series; the influence of circuit parameter differences such as full-bridge module equivalent impedance and transformer leakage inductance of the low-voltage side parallel circuit on system current sharing can be eliminated, and the method has wide application scenes in low-voltage large-current scenes such as energy storage and direct-current micro-grids.
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