Bidirectional LCC-LCC-Compensated 20 kW Wireless Power Transfer System for Medium-Duty Vehicle Charging

Journal Article · Tue Jan 05 00:00:00 EST 2021 · IEEE Transactions on Transportation Electrification

DOI:https://doi.org/10.1109/TTE.2021.3049138· OSTI ID:1814385

Mohammad, Mostak ^[1]; Onar, Omer ^[1]; Su, Gui-Jia ^[1]; Pries, Jason ^[1]; Galigekere, Veda Prakash ^[1]; Anwar, Saeed ^[1]; Asa, Erdem ^[1]; Wilkins, Jon ^[1]; Wiles, Randy ^[1]; White, Cliff ^[1]; Seiber, Larry ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

This paper presents the design and demonstration of a bidirectional 20 kW wireless charging system (WCS) with a significantly large airgap (11 inches) and asymmetrical input-output voltage levels. Analytical and experimental sensitivity analyses of the WCS resonant tank were conducted to verify the optimal operating region under the load and frequency variation. The inverter and rectifier were designed with switching components, the charging pads were designed with double-D (DD) coils, and the tuning networks were designed with an LCC-LCC tuning circuit. The grid and vehicle side tuning circuits were designed separately to achieve a ~1:2 gain for the asymmetrical input (800 V_dc) and output (350 V_dc) voltage. The proposed WCS was designed, simulated, and tested to verify the efficiency, power transfer capacity, and sensitivity under load variation. The experimental results show that, at 20-kW output power, the achieved grid to vehicle dc-dc efficiency was 96.1%, and vehicle to grid dc-dc efficiency was 96.2%. The proposed system is the largest-airgap bidirectional WCS with the highest efficiency and power density.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1814385
• Journal Information: IEEE Transactions on Transportation Electrification, Journal Name: IEEE Transactions on Transportation Electrification Journal Issue: 3 Vol. 7; ISSN 2372-2088
• Publisher: IEEE Xplore
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
LCC compensation
air gaps
batteries
bidirectional wireless charging system
coils
couplings
electric vehicle charging
inductance
optical wavelength conversion
rectifiers
wireless power transfer