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A 120 W Class-E Power Module with an Adaptive Power Combiner for a 6.78 MHz Wireless Power Transfer System

Author

Listed:
  • Ui-Gyu Choi

    (Department of Electronic Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan 38541, Gyeongbuk, Korea)

  • Jong-Ryul Yang

    (Department of Electronic Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan 38541, Gyeongbuk, Korea)

Abstract

In this article, a highly efficient power module is presented with two class-E power amplifiers and an adaptive power combiner for transmitting output powers >100 W at 6.78 MHz in a wireless power transfer system. The losses caused by the combiners and interstage matching circuits or mismatching between the amplifier, and the combiners can significantly reduce the overall efficiency of the power module. To achieve an efficient combination of the output amplifier signals, the adaptive power combiner is proposed based on the consideration of the optimum load impedance characteristics of the power amplifiers. The input impedance of the combiner is designed using series capacitors and resistors between the two input ports of the combiner and the two output signals of the class-E amplifiers at the optimum load condition. The output performances of the proposed module can decrease based on the component mismatch between the two power amplifiers. The proposed power module was implemented on an FR4 PCB, with a 15 mm metal heat sink, and demonstrated an output power of 123.3 W, a power-added efficiency of 85.7%, and a power gain of 25.6 dB at 6.78 MHz. The second harmonic suppression of the module was 37 dBc.

Suggested Citation

  • Ui-Gyu Choi & Jong-Ryul Yang, 2018. "A 120 W Class-E Power Module with an Adaptive Power Combiner for a 6.78 MHz Wireless Power Transfer System," Energies, MDPI, vol. 11(8), pages 1-15, August.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:8:p:2083-:d:163053
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    References listed on IDEAS

    as
    1. Thuc Phi Duong & Jong-Wook Lee, 2015. "A Dynamically Adaptable Impedance-Matching System for Midrange Wireless Power Transfer with Misalignment," Energies, MDPI, vol. 8(8), pages 1-25, July.
    2. Vijith Vijayakumaran Nair & Jun Rim Choi, 2016. "An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique," Energies, MDPI, vol. 9(3), pages 1-15, March.
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    Cited by:

    1. Alexander Sutor & Martin Heining & Rainer Buchholz, 2019. "A Class-E Amplifier for a Loosely Coupled Inductive Power Transfer System with Multiple Receivers," Energies, MDPI, vol. 12(6), pages 1-15, March.
    2. Aam Muharam & Suziana Ahmad & Reiji Hattori, 2020. "Scaling-Factor and Design Guidelines for Shielded-Capacitive Power Transfer," Energies, MDPI, vol. 13(16), pages 1-22, August.

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