TY - JOUR
T1 - A Magnetic Design Method Considering DC-Biased Magnetization for Integrated Magnetic Components Used in Multiphase Boost Converters
AU - Imaoka, Jun
AU - Okamoto, Kenkichiro
AU - Kimura, Shota
AU - Noah, Mostafa
AU - Martinez, Wilmar
AU - Yamamoto, Masayoshi
AU - Shoyama, Masahito
N1 - Funding Information:
Manuscript received October 24, 2016; revised January 17, 2017 and March 29, 2017; accepted May 11, 2017. Date of publication May 23, 2017; date of current version January 3, 2018. This work was supported by the Japan Society for the Promotion of Science KAKENHI Grant 16K18059. Recommended for publication by Associate Editor O. Lucia. (Corresponding author: Jun Imaoka.) J. Imaoka, K. Okamoto, and M. Shoyama are with the Department of Electrical Engineering, Kyushu University, Fukuoka 819-0395, Japan (e-mail: imaoka@ees.kyushu-u.ac.jp; ie216662@ckt.ees.kyushu-u.ac.jp; shoyama@ ees.kyushu-u.ac.jp).
Publisher Copyright:
© 1986-2012 IEEE.
PY - 2018/4
Y1 - 2018/4
N2 - High power density and high efficiency in dc/dc converters are required in various applications such as the automotive application. Interleaved multiphase circuits with integrated magnetic components can fulfill these requirements because passive components occupying significant space in power converters can be downsized without high-switching frequency driving of power devices. However, dc-biased magnetization is a drawback of integrated magnetic components because of unbalanced inductor average currents. This imbalance arises from the tolerance among the phase components. To overcome this problem, inductor average current control is implemented in interleaved multiphase dc/dc converters. Nevertheless, the imbalance cannot be completely eliminated because the current sensors inserted into each phase have gain errors. The purpose of this paper is to present a magnetic design method to improve the immunity to unbalanced currents. A comprehensive analysis is carried out with two main objectives: to prevent magnetic saturation, which may arise due to the current unbalance and to downsize the magnetic components by selecting the optimal coupling coefficient taking into consideration the maximum permissible percentage of unbalanced currents. Simulation case studies are presented to support the analysis. Finally, a 1-kW prototype of the interleaved boost converter is built to validate the accuracy of the design method.
AB - High power density and high efficiency in dc/dc converters are required in various applications such as the automotive application. Interleaved multiphase circuits with integrated magnetic components can fulfill these requirements because passive components occupying significant space in power converters can be downsized without high-switching frequency driving of power devices. However, dc-biased magnetization is a drawback of integrated magnetic components because of unbalanced inductor average currents. This imbalance arises from the tolerance among the phase components. To overcome this problem, inductor average current control is implemented in interleaved multiphase dc/dc converters. Nevertheless, the imbalance cannot be completely eliminated because the current sensors inserted into each phase have gain errors. The purpose of this paper is to present a magnetic design method to improve the immunity to unbalanced currents. A comprehensive analysis is carried out with two main objectives: to prevent magnetic saturation, which may arise due to the current unbalance and to downsize the magnetic components by selecting the optimal coupling coefficient taking into consideration the maximum permissible percentage of unbalanced currents. Simulation case studies are presented to support the analysis. Finally, a 1-kW prototype of the interleaved boost converter is built to validate the accuracy of the design method.
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U2 - 10.1109/TPEL.2017.2707385
DO - 10.1109/TPEL.2017.2707385
M3 - Article
AN - SCOPUS:85040787925
SN - 0885-8993
VL - 33
SP - 3346
EP - 3362
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 4
M1 - 7932878
ER -