Comparison of 6.78 MHz Amplifier Topologies for 33W, Highly Resonant Wireless Power Transfer

Conference: PCIM Asia 2017 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
06/27/2017 - 06/29/2017 at Shanghai, China

Proceedings: PCIM Asia 2017

Pages: 7Language: englishTyp: PDF

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Rooij, Michael de; Zhang, Yuanzhe (Efficient Power Conversion, USA)

AirFue (exp TM) Class 4 standard specifies a power of 33 W and wide relative impedance range of 50 Ω and 296j Ω. ZVS Class D and class E amplifier topologies are still designers’ top choices. This paper experimentally compares the two topologies in differential mode configurations over a wide load impedance range. The amplifiers were built using eGaN(r) FETs for highest efficiency when operated at 6.78 MHz. The choices of different eGaN FETs are also discussed. The differential ZVS Class D amplifier can operate over a wider reactance range and has higher light load efficiency compared to the Class E amplifier.