Journal
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
Volume 8, Issue 3, Pages 4001-4013Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTE.2022.3160212
Keywords
Zero voltage switching; Stress; Couplings; Harmonic analysis; Time-domain analysis; Integrated circuit modeling; Analytical models; Component stress; LCCL-LC compensation; LCCL-TT compensation; magnetically coupled resonant wireless power transfer (MCR WPT); multilayer parallel coils; parameter design methodology; zero-voltage switching (ZVS)
Funding
- National Natural Science Foundation of China [51877103]
- Natural Science Foundation of Jiangsu Province, China [BK20211184]
- Six Talent Peaks Project of Jiangsu Province, China [XYNQC-006]
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In this article, a parameter design methodology for high-power and medium-range-distance magnetically coupled resonant wireless power transfer (MCR WPT) applications was proposed to achieve high system efficiency. By building an accurate time-domain system model, designing key parameters, and adopting a double-layer coil configuration and LCCL-TT compensation network, coil losses were reduced, current sharing was achieved, and system efficiency was maximized.
For the magnetically coupled resonant wireless power transfer (MCR WPT) applications with high-power level and medium-range distance, the low coupling coefficient brings severe challenges to the system efficiency and reliability, as the coil loss and the voltage/current stress on compensation components are both considerable; meanwhile, the high operating frequency that contributes to improve the power density will result in high switching loss and related electromagnetic interference. In this article, a parameter design methodology for high-power and medium-range-distance MCR WPT applications was proposed to achieve high system efficiency. The accurate time-domain system model was built to obtain the relationship among voltage/current stresses on the compensation components, zero-voltage-switching (ZVS) conditions of power switches and system parameters. The key parameters, including the switching frequency, the coil self-inductance, and the compensation inductance, are designed to realize wide-range ZVS and reduce voltage/current stresses. Double-layer coil configuration was adopted instead of the traditional single-layer coil to reduce coil losses, and the series compensation capacitors in TX and RX coils were split to achieve current sharing between double-layer coils. Meanwhile, the LCCL-TT compensation network was used to achieve the optimal load and maximize the system efficiency. Finally, a 1-kW MCR WPT prototype within 100-cm transmission distance was implemented in the laboratory for experiments, and the system efficiency under the rated condition is 80.62%.
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