A GaN-based 100 W two-stage wireless power transmitter with inherent current source output

A two-stage power conversion architecture for the transmitter in wireless power transfer applications is introduced. The system achieves high efficiency at output powers up to 100W, and exhibits constant output current over varying load impedance. A front-end bridgeless totem pole rectifier provides power factor correction (PFC), necessary at the designed power level. This rectifier achieves high efficiency by eliminating the conventional diode full bridge and by achieving soft switching operation. A full bridge inverter, switching at 6.78MHz, generates the AC output. Combined with an output passive filter network, the inverter achieves constant output current with load variation without the need for dynamic feedback control. A prototype system is constructed and tested experimentally to verify operation.

[1]  Fred C. Lee,et al.  Resonant Power Processors, Part I---State Plane Analysis , 1985, IEEE Transactions on Industry Applications.

[2]  Omer C. Onar,et al.  Primary-Side Power Flow Control of Wireless Power Transfer for Electric Vehicle Charging , 2015, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[3]  Fred C. Lee,et al.  Operation analysis of digital control based MHz totem-pole PFC with GaN device , 2015, 2015 IEEE 3rd Workshop on Wide Bandgap Power Devices and Applications (WiPDA).

[4]  J. W. Kolar,et al.  Optimal design of a 5kW/dm3 / 98.3% efficient TCM resonant transition single-phase PFC rectifier , 2010, The 2010 International Power Electronics Conference - ECCE ASIA -.

[5]  Zhu Han,et al.  Wireless Charging Technologies: Fundamentals, Standards, and Network Applications , 2015, IEEE Communications Surveys & Tutorials.

[6]  Zhengyu Lu,et al.  Totem-Pole Boost Bridgeless PFC Rectifier With Simple Zero-Current Detection and Full-Range ZVS Operating at the Boundary of DCM/CCM , 2011, IEEE Transactions on Power Electronics.

[7]  Omer C. Onar,et al.  A high-power wireless charging system development and integration for a Toyota RAV4 electric vehicle , 2016, 2016 IEEE Transportation Electrification Conference and Expo (ITEC).

[8]  Dushan Boroyevich,et al.  GaN-based high frequency totem-pole bridgeless PFC design with digital implementation , 2015, 2015 IEEE Applied Power Electronics Conference and Exposition (APEC).

[9]  Fred C. Lee,et al.  Digital-based interleaving control for GaN-based MHz CRM totem-pole PFC , 2016, 2016 IEEE Applied Power Electronics Conference and Exposition (APEC).

[10]  Hongjian Sun,et al.  Wireless Power Transfer: Survey and Roadmap , 2015, 2015 IEEE 81st Vehicular Technology Conference (VTC Spring).

[11]  Chenglin Liao,et al.  Analysis of power factor correction circuit for EV wireless charging system , 2014, 2014 IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific).

[12]  Jian Hu,et al.  Stochastic optimization for economic operation of plug-in electric vehicle charging stations at a municipal parking deck integrated with on-site renewable energy generation , 2014, 2014 IEEE Transportation Electrification Conference and Expo (ITEC).

[13]  Lixin Tang,et al.  SiC MOSFET based single phase active boost rectifier with power factor correction for wireless power transfer applications , 2014, 2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014.

[14]  Udaya K. Madawala,et al.  Current sourced bi-directional inductive power transfer system , 2011 .

[15]  Narayan C. Kar,et al.  A Comparative Study of Power Supply Architectures in Wireless EV Charging Systems , 2015, IEEE Transactions on Power Electronics.

[16]  Johann W. Kolar,et al.  Ultraflat Interleaved Triangular Current Mode (TCM) Single-Phase PFC Rectifier , 2014, IEEE Transactions on Power Electronics.

[17]  David C. Yates,et al.  Load-independent Class EF inverters for inductive wireless power transfer , 2016, 2016 IEEE Wireless Power Transfer Conference (WPTC).