Thermal-Aware Wireless Charging System Design and Optimization for Wearable Devices with Magnetic Shielding

• Published in: IEEE International Symposium on Electromagnetic Compatibility (EMC) pp. 455 - 459
• Main Authors: Liang, Jingchen, Keikhosravy, Kamyar, Abarham, Mehdi, Gottipati, Pavani
• Format: Conference Proceeding
• Language: English
• Published: IEEE 05.08.2024
• Subjects: Electromagnetic; Electromagnetic interference; Electromagnetic Interference (EMI); Electromagnetics; Inductive charging; Magnetic shielding; Multiphysics; Optimization; System analysis and design; Temperature distribution; Thermal; Thermal analysis; Thermal resistance; Wearables; Wireless Charging; Wireless communication
• ISSN: 2158-1118
• DOI: 10.1109/EMCSIPI49824.2024.10705558

Design of wireless chargers has become an increasingly complex subject in recent years due to the demand for reduced footprint of the wireless charger, increasing operating frequency and addition of permanent magnets for improved alignment. This paper presents a complete simulation workflow to address end-to-end design challenges for the wireless charging system of a smart watch including an integrated electromagnetic and thermal analyses and experimental validation of wireless charging coils, magnetic shielding to reduce electromagnetic interference, and system analysis with power electronics for efficiency calculation. Spatial power and temperature distributions are shared between the electromagnetics and thermal solutions and temperature dependent materials are considered for calculations to make this workflow unique and accurate. This provides engineers with a comprehensive wireless charging design and optimization workflow for consumer electronics applications.