Design, Analysis, and Experimental Verification of a Ball-Joint Structure With Constant Coupling for Capacitive Wireless Power Transfer

Liang, Hui; Lee, Chi-Kwan; Hui, S. Y. Ron

doi:10.1109/jestpe.2019.2938226

Cited by 14 publications

(12 citation statements)

References 20 publications

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“…ZVS) is also achieved as the cut-off current at the switching transient is about 5 A. In addition, the input and output voltage are out of phase as predicted by (11). Moreover, when output power varies, the shape of I in waveform changes accordingly.…”

Section: Design Procedures and Simulation Verificationmentioning

confidence: 93%

“…Eqs. (11) and 12depict V o and output power P o while I o is the output battery current, which is a function of the load condition. Consequently, P o is also proportional to the coupling capacitor C M .…”

Section: Proposed Lcl-l Compensation Topology Cpt Systemmentioning

confidence: 99%

“…The thickness of all four plates are the same as 2 mm. Once all the above conditions are matched, then values of L 1 , L 1p and C 1p are calculated using (9), (11) and (16). Furthermore, the specifications of the CPT charger and all other parameters are summarized in Table 2.…”

Section: Design Procedures and Simulation Verificationmentioning

confidence: 99%

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An Improved LCL-L Compensation Topology for Capacitive Power Transfer in Electric Vehicle Charging

Dahidah

Pickert

et al. 2020

IEEE Access

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This paper proposes an LCL-L compensation circuit for high power capacitive power transfer (CPT) aiming at minimizing number of resonant components and improving system performance. The proposed topology adopts only four external resonant components at both sides of the capacitive coupler. The output power is proportional to the capacitive coupling coefficient, therefore, it simplifies the design procedure and abolishes protection circuit requirements under coupler's misalignment. Moreover, optimizing efficiency at full-load conditions of compensation network can be easily achieved in this system by designing resonant components at the highest value of the mutual capacitance. Theoretical analysis of the proposed system is conducted alongside comparison to lasted CPT compensation circuits. Simulation and experimental results of a 1.5-kW CPT prototype with an air gap distance of 150 mm are provided to verify the feasibility and the effectiveness of the proposed system. System performances under different coupler's misalignment conditions and output power levels are also examined and discussed as well. INDEX TERMS Capacitive power transfer, compensation circuits, LCL-L topology, electric vehicles, battery charger.

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Section: Design Procedures and Simulation Verificationmentioning

confidence: 93%

Section: Proposed Lcl-l Compensation Topology Cpt Systemmentioning

confidence: 99%

See 1 more Smart Citation

An Improved LCL-L Compensation Topology for Capacitive Power Transfer in Electric Vehicle Charging

Dahidah

Pickert

et al. 2020

IEEE Access

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“…Unlike inductive coils that generate magnetic fields around its core, coupling plates tend to contain electric fields within the coupling section area. In order to achieve effective capacitive coupling, the medium is considered dielectric with a transfer distance of 1 mm [19][20][21][22][23]. This increases the coupling capacitance and ultimately overcomes the requirement of high voltage to the coupling section.…”

Section: Review Of Capacitive Coupling Structuresmentioning

confidence: 99%

“…Capacitive films are a better substitute for bulky and expensive ferrite cores. Additionally, capacitive coupled transfer distance of 1 mm [19][20][21][22][23]. This increases the coupling capacitance and ultimately overcomes the requirement of high voltage to the coupling section.…”

Section: Introductionmentioning

confidence: 99%

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

Bezawada

Zhang

2021

Electronics

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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.

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A new capacitive coupler design for wireless capacitive power transfer applications

Erel

Bayındır

Aydemir

2023

Engineering Science and Technology, an International Journal

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Design, Analysis, and Experimental Verification of a Ball-Joint Structure With Constant Coupling for Capacitive Wireless Power Transfer

Cited by 14 publications

References 20 publications

An Improved LCL-L Compensation Topology for Capacitive Power Transfer in Electric Vehicle Charging

An Improved LCL-L Compensation Topology for Capacitive Power Transfer in Electric Vehicle Charging

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

A new capacitive coupler design for wireless capacitive power transfer applications

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