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Abstract:
For the problems with traditional class E inverters, such as higher inductor losses, more sensitive to the resonant parameters and lower power limitation, a novel topology with dual (or even) class E inverters and power combination for wireless power transfer (WPT) applications was proposed. Coupled inductors were proposed to suppress the even-order harmonics currents and reduce loaded quality factor, so that the inverters can still work normally and high efficiently even with large deviations of resonant parameters. And magnetic integration of coupled inductors was proposed to reduce the numbers and losses of the magnetics. Series-series resonance compensation scheme was used for WPT system and π-type (CLC) transconductance was used to ensure the constant output voltage and independence of voltage gain to the loads. A prototype with 1MHz operation frequency was designed and built to verify the feasibility and high performances of the proposed topology and to show that the voltage gain characteristics are independent with the loads and soft switching could be achieved at whole load ranges. The peak efficiency of the inverter reaches 92%. © 2015 Chinese Society for Electrical Engineering.
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Source :
Proceedings of the Chinese Society of Electrical Engineering
ISSN: 0258-8013
CN: 11-2107/TM
Year: 2015
Issue: 21
Volume: 35
Page: 5577-5584
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