Wireless Battery Chargers Operating at Multiple Switching Frequencies with Improved Performance

Deniss Stepins (), Aleksandrs Sokolovs, Janis Zakis and Ouseph Charles
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Deniss Stepins: Institute of Industrial Electronics and Electrical Engineering, Riga Technical University, LV-1048 Riga, Latvia
Aleksandrs Sokolovs: Institute of Industrial Electronics and Electrical Engineering, Riga Technical University, LV-1048 Riga, Latvia
Janis Zakis: Institute of Industrial Electronics and Electrical Engineering, Riga Technical University, LV-1048 Riga, Latvia
Ouseph Charles: Dyninno Ltd., LV-1010 Riga, Latvia

Energies, 2023, vol. 16, issue 9, 1-18

Abstract: The operation of wireless battery chargers at multiple switching frequencies may lead to a noticeable suppression of conducted and radiated electromagnetic interference (EMI) at the cost of decreased efficiency (mainly at lower load resistances) and increased peak and root mean square values of currents of power components of the wireless battery charger. Moreover, the reduction in conducted EMI is only moderate (<8.3 dB). Therefore, a novel approach based on modified resonant circuits and a modified control technique to obtain better reduction in the conducted and radiated EMI without significantly compromising other performance characteristics of the wireless battery charger is proposed and validated by using simulations and experiments. It is shown in this paper that the wireless charger operating at multiple switching frequencies with the proposed approach for the performance improvement has a more effective implementation of the four-switching frequency spread-spectrum technique with better conducted and radiated EMI reduction at all load resistances, lower values of peak and RMS currents at all load resistances, and higher efficiency in constant current mode and in the beginning of constant voltage mode (at lower values of the load resistances) than that of the conventional wireless charger operating at multiple switching frequencies.

Keywords: wireless battery charger; inductive-resonant; spread spectrum; electromagnetic interference; efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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