TY - GEN

T1 - Analysis of Planar E+I and ER+I Transformers for Low-Voltage High-Current DC/DC Converters with Focus on Winding Losses and Leakage Inductance

A1 - Pittini,Riccardo

A1 - Zhang,Zhe

A1 - Ouyang,Ziwei

A1 - Andersen,Michael A. E.

A1 - Thomsen,Ole Cornelius

AU - Pittini,Riccardo

AU - Zhang,Zhe

AU - Ouyang,Ziwei

AU - Andersen,Michael A. E.

AU - Thomsen,Ole Cornelius

PY - 2012

Y1 - 2012

N2 - In this paper an analysis of two planar transformers designed for high-current switching applications is presented. Typical converter application is represented by fuel and electrolyser cell converters. The transformer designs are based on E+I and ER+I planar cores while the analysis focuses on winding resistance and leakage inductances which represent the main concerns related to low-voltage high-current applications. The PCB winding design has a one to one turn ratio with no interleaving between primary and secondary windings. The main goal was to determine if ER planar core could provide a significant advantage in terms of winding losses compared to planar E cores. Results from finite element analysis highlight that low frequency winding resistance is lower for the ER core<br/>since it is dominated by the lower mean turn length however, as the AC-resistance becomes dominating the winding eddy current losses increases more in the ER core than in the E core design.<br/>Calculated and simulated leakage inductances for the analyzed cores do not show relevant differences. A laboratory prototype based on E64 planar core is used as reference. Laboratory<br/>measurements highlight that FEM analysis provides more realistic results when computing the winding AC-resistance.

AB - In this paper an analysis of two planar transformers designed for high-current switching applications is presented. Typical converter application is represented by fuel and electrolyser cell converters. The transformer designs are based on E+I and ER+I planar cores while the analysis focuses on winding resistance and leakage inductances which represent the main concerns related to low-voltage high-current applications. The PCB winding design has a one to one turn ratio with no interleaving between primary and secondary windings. The main goal was to determine if ER planar core could provide a significant advantage in terms of winding losses compared to planar E cores. Results from finite element analysis highlight that low frequency winding resistance is lower for the ER core<br/>since it is dominated by the lower mean turn length however, as the AC-resistance becomes dominating the winding eddy current losses increases more in the ER core than in the E core design.<br/>Calculated and simulated leakage inductances for the analyzed cores do not show relevant differences. A laboratory prototype based on E64 planar core is used as reference. Laboratory<br/>measurements highlight that FEM analysis provides more realistic results when computing the winding AC-resistance.

KW - Planar Magnetics

KW - Transformer Parasitics

KW - DC/DC Switching Converters

KW - High-Current

KW - Erbium

KW - Finite element methods

KW - Inductance

KW - Resistance

KW - Transformer cores

KW - Windings

U2 - 10.1109/IPEMC.2012.6258778

DO - 10.1109/IPEMC.2012.6258778

SN - 978-1-4577-2087-1

BT - Proceedings of The International Power Electronics and Motion Control Conference (IPEMC)

T2 - Proceedings of The International Power Electronics and Motion Control Conference (IPEMC)

SP - 488

EP - 493

ER -