@article{10902/39075,
year = {2026},
month = {1},
url = {https://hdl.handle.net/10902/39075},
abstract = {Power sources based on multiphase resonant converters, controlled by phase-shift at constant switching frequency, reduce conduction losses and enable current-mode operation for battery charger applications. However, phase-shift modulation in multiphase class D resonant converters inherently causes uneven current distribution among sections, leading to a thermal imbalances in transistors and inductors. To address this, a thermal balancing control strategy is proposed, which equalizes temperatures by modulating the amplitude (AM) of the resonant currents flowing through the transistors and inductors in each Class D section. A simple hysteresis band outer controller set up the average phase shift required to balance the temperature in the resonant branches. This method involves periodically exchanging the control signals of the inverter sections, which does not affect the output variables due to the symmetrical structure of the circuit. Thus, this approach enables thermal management without interfering with the inner output variable control set by the instantaneous phase shift. The proposal is validated experimentally using a four-phase LCpCs resonant converter designed for a Lithium-ion battery charger application.},
organization = {This work was supported by the Spanish Ministry of Science and Innovation MICIU/AEI/10.13039/501100011033 and by FEDER, UE under the research project PID2021-128941OB-I00, “Efficient Energy Transformation in Industrial Environments”, and the project 2023-TCN-008 UETAI, which the Regional Government of Cantabria and the EU funded. The authors also thank Prof. Enrique Valdes from the Battery Laboratory at the University of Oviedo for providing the battery charge profile data.},
publisher = {Elsevier},
publisher = {Journal of Power Sources, 2026, 661, 238688},
title = {Thermal balancing of multiphase battery chargers controlled by phase shift},
author = {Brañas Reyes, Christian and Pigazo López, Alberto and Casanueva Arpide, Rosario and Azcondo Sánchez, Francisco Javier and Díaz Rodríguez, Francisco Javier and Lamo Anuarbe, Paula},
}