scholarly journals A Case Study: Influence of Circuit Impedance on the Performance of Class-E2 Resonant Power Converter for Capacitive Wireless Power Transfer

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1461
Author(s):  
Yashwanth Bezawada ◽  
Yucheng Zhang
Keyword(s):  
Duty Cycle ◽  
Wireless Power Transfer ◽  
Power Converter ◽  
Maximum Power ◽  
Power Transfer ◽  
Wireless Power ◽  
Impedance Characteristics ◽  
Active Switch ◽  
Resonant Inductor ◽  
The Impact

The evolution of power electronics led to rapid development in wireless charging technology; as a result, a single active switch topology was introduced. The present market utilizes inductive wireless power transfer (IPT); because of the disadvantages of cost, size, and safety concerns, research on wireless power transfer was diverted towards capacitive wireless power transfer (CPT). This paper studies the optimal impedance tracking of the capacitive wireless power transfer system for maximum power transfer. Compared to prior methods developed for maximum power point tracking in power control, this paper proposes a new approach by means of finding impedance characteristics of the CPT system for a certain range of frequencies. Considering the drone battery as an application, a single active switch Class-E2 resonant converter with circular coupling plates is utilized. Impedance characteristics are identified with the help of equations related to the input and resonant impedance. The impedance tracking is laid out for various resonant inductors, and the difference in current peak is observed for each case. Simulations verify and provide additional information on the reactive type. Additionally, hardware tests provide the variation of input current and output voltage for a range of frequencies from 70 kHz to 300 kHz. Efficiency at the optimal impedance points for a resonant inductor with 50 μH and 100 μH are tested and analyzed. It is noted that the efficiency for a resonant inductor with 50 μH is 8% higher compared to the CPT with a 100 μH resonant inductor. Further hardware tests were performed to investigate the impact of frequency and duty cycle variation. Zero-voltage-switching (ZVS) limits have been discussed with respect to both frequency and duty cycle.

Theoretical Analysis of Prospects of Organic Photovoltaics as a Multi-Functional Solar Cell and Laser Power Converter for Wireless Power Transfer

2020 ◽  
Vol 20 (8) ◽  
pp. 4878-4883
Author(s):  
Premkumar Vincent ◽  
Jaewon Jang ◽  
In Man Kang ◽  
Philippe Lang ◽  
Hyeok Kim ◽  
...  
Keyword(s):  
Laser Power ◽  
Power Converters ◽  
Power Conversion ◽  
Wireless Power Transfer ◽  
Power Converter ◽  
Potential Candidate ◽  
Power Transfer ◽  
Wireless Power ◽  
Power Harvesting ◽  
Single Junction

Few reports have researched on utilization of laser power conversion systems for wireless power transfer in aeronautical applications. III–V compound semiconductors are commonly used as photovoltaic (PV) power converters in the previous studies. We propose the prospects of using organic absorbers as PV power converters. For laser power conversion to be applied for portable devices, the PV module should be easily processable, thin, low-weight, and printable on flexible substrates. Organic PVs provide all the above advantages, and thus, could serve as a potential candidate for laser power harvesting applications. Moreover, they can also be made transparent, which could be utilized in power harvesting lamination coatings and windows. We had simulated the possibility of using single-junction and tandem photovoltaic structures for 670 nm and 850 nm laser power harvesting. FDTD simulations were conducted to optimize the PV structure in order to maximize the absorption at the laser wavelengths. A maximum PCE of 16.17% for single-junction PV and 24.85% for tandem PV was theoretically obtained.

scholarly journals Accurate Computation of Mutual Inductance of Non Coaxial Pancake Coils

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4907
Author(s):  
Mauro Parise ◽  
Fabrizio Loreto ◽  
Daniele Romano ◽  
Giulio Antonini ◽  
Jonas Ekman
Keyword(s):  
Sharp Decrease ◽  
Wireless Power Transfer ◽  
Mutual Inductance ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Classic Problem ◽  
Wireless Power Transfer System ◽  
Pancake Coils ◽  
The Impact

The computation of self and mutual inductances of coils is a classic problem of electrical engineering. The accurate modeling of coupled coils has received renewed interest with the spread of wireless power transfer systems. This problem has been quite well addressed for coplanar or perfectly coaxial coils but it is known that the misalignment conditions easily lead to a sharp decrease in the efficiency. Hence, it is crucial to take misalignment into account in order to properly design the overall wireless power transfer system. This work presents a study to compute analytically the mutual inductance of non-coaxial pancake coils with parallel axes. The accuracy of the proposed methodology is tested by comparison with the numerical results obtained using the tool Fast-Henry. Then, a wireless power transfer system, comprising a full bridge inverter is considered, showing the impact of the misalignment on the coupling between two pancake coils and, thus, between the source and the load.

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