Generalized Data-Driven Model to Minimize Current Ringing in DAB Power Converter

Abstract

The present paper identifies the root causes of current ringing in a Dual Active Bridge (DAB) power converter and proposes a novel methodology to design the magnetic tank (transformer, primary and secondary inductances) configuration to minimize it. In particular, two metrics proportional to the current harmonic content on each transformer side are correspondingly proposed based on a steady-state frequency analysis of primary and secondary ac voltages and impedance of the magnetic tank. To get the metrics, different combinations of dv/dt, switching frequency, primary and secondary inductance configuration, and stray capacitance of the magnetic tank (model inputs) are simulated to generate primary and secondary harmonic current indicators (model outputs). Then, a machine-learning model is trained to predict the harmonic current metrics for each given operating setpoint. The model is able to make predictions beyond its training data, therefore generalizing to unseen inputs and enabling rapid evaluation of various designs. Experimental results are presented to evaluate the performance of the metric model for 4 different magnetic tank configurations. Designers can use the methodology to rapidly analyze the generation of current ringing under multiple operating parameters, identifying operating zones with low harmonic content and reduced sensitivity to parameter shifts for the converter's operation.

Design of Interleaved Winding for Multilayer Planar Inductor and Its Application in Reducing Current Ringing of LLC Resonant Converter

“…This prevented inductor saturation and allowed for the planar inductors to operate at frequencies above 1 MHz. We applied the inductor turns number design formula, as shown in (10).…”

“…where L is the inductance value of the designed inductor, l is the magnetic path length of the E22 core, and A is the cross-sectional area of the E22 core. Using Equation (10) to calculate the required turns number of an inductor, the turns of the winding should be four turns. We designed a two-layer printed circuit board in series with a four-turn winding structure, with two turns in a single layer and a turn width of 2.5 mm in every turn.…”

“…Energies 2024, 17, 1649 2 of 16 For the analysis of the parasitic capacitance of the inductor, Refs. [8][9][10] give an accurate calculation model of inductor parasitic capacitance and verify it in a DAB active full-bridge converter. In [11], the causes of planar inductor parasitic capacitance were analyzed; a planar inductor structure optimization scheme was designed; and the parasitic capacitance was reduced.…”