Derivation of the Resonance Mechanism for Wireless Power Transfer Using Class-E Amplifier

In this study, we investigated the resonance mechanism of 6.78 MHz resonant wireless power transfer (WPT) systems. The depletion mode of a gallium nitride high-electron-mobility transistor (GaN HEMT) was used to switch the states in a class-E amplifier circuit in this high frequency. The D-mode GaN...

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Bibliographic Details
Published in:Energies (Basel) 2021-02, Vol.14 (3), p.632
Main Authors: Liu, Ching-Yao, Wang, Guo-Bin, Wu, Chih-Chiang, Chang, Edward, Cheng, Stone, Chieng, Wei-Hua
Format: Article
Language:English
Subjects:
Amplifiers
Battery chargers
Charging
class-E amplifier
Current leakage
Depletion
Design optimization
Diodes
Efficiency
Electric potential
Gallium
Gallium nitrides
GaN HEMT
High electron mobility transistors
Power supply
Receivers & amplifiers
Resonance
Resonant frequencies
Systems stability
Transistors
Voltage
Waveforms
wireless power transfer
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Summary:In this study, we investigated the resonance mechanism of 6.78 MHz resonant wireless power transfer (WPT) systems. The depletion mode of a gallium nitride high-electron-mobility transistor (GaN HEMT) was used to switch the states in a class-E amplifier circuit in this high frequency. The D-mode GaN HEMT without a body diode prevented current leakage from the resonant capacitor when the drain-source voltage became negative. The zero-voltage switching control was derived according to the waveform of the resonant voltage across the D-mode GaN HEMT without the use of body diode conduction. In this study, the effect of the resonant frequency and the duty cycle on the resonance mechanism was derived to achieve the highest WPT efficiency. The result shows that the power transfer efficiency (PTE) is higher than 80% in a range of 40 cm transfer distance, and the power delivered to load (PDL) is measured for different distances. It is also possible to cover different applications related to battery charging and others using the proposed design.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14030632