Highly Efficient WPT System With Negative Impedance Converter for Q-factor Improvement

Kim, Tae Hyung; Yun, Gi-Ho; Lee, Woongyong; Yook, Jong Gwan

doi:10.1109/access.2019.2933004

Cited by 17 publications

(8 citation statements)

References 36 publications

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“…Figure 18 shows the performance comparison of the PTE (%) in terms of transmission distance (cm). The method proposed in this paper yields performance comparable to the WPT with NIC method [24] with, however, no additional impedance transformation network circuit.…”

Section: Resonant Wpt Resultsmentioning

confidence: 93%

Minimum Power Input Control for Class-E Amplifier Using Depletion-Mode Gallium Nitride High Electron Mobility Transistor

Weng

Chang

et al. 2021

Energies

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In this study, we implemented a depletion (D)-mode gallium nitride high electron mobility transistor (GaN HEMT, which has the advantage of having no body diode) in a class-E amplifier. Instead of applying a zero voltage switching control, which requires high frequency sampling at a high voltage (>600 V), we developed an innovative control method called the minimum power input control. The output of this minimum power input control can be presented in simple empirical equations allowing the optimal power transfer efficiency for 6.78 MHz resonant wireless power transfer (WPT). In order to reduce the switching loss, a gate drive design for the D-mode GaN HEMT, which is highly influential for the reliability of the resonant WPT, was also produced and described here for circuit designers.

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Section: Resonant Wpt Resultsmentioning

confidence: 93%

Minimum Power Input Control for Class-E Amplifier Using Depletion-Mode Gallium Nitride High Electron Mobility Transistor

Weng

Chang

et al. 2021

Energies

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“…It has been reported that k decreases rapidly with the increase in a separation distance between the coupled resonators and this, in turn, leads to reduced PTE [6]. Therefore, the high Q resonators are used to achieve high PTE from WPT systems with weak k [37]. The coupling phenomenon is divided into three main types: i) undercoupling − the range where resonators are poorly coupled and, as a result, PTE drops abruptly; ii) overcoupling − occurs when two resonators are placed at very close proximity.…”

Section: Wpt Developmentmentioning

confidence: 99%

A Comprehensive Analysis, Design, and Experimental Evaluation of Single-Loop Polygonal Slotted RF Resonators and WPT Systems

2023

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A thorough analysis of slotted ground plane (SGP)-based resonators designed for wireless power transfer (WPT) applications is reported in this paper. For the first time, some new findings that relate a resonator and WPT performance metrics to the slot shape, quality factor (Q), and radiation loss are presented in a very comprehensive manner. As a case study, a single-loop polygonal shape was considered to carry out all analyses and investigations. It has been identified that the slot shape has no impact on the performance of resonators and, hence, developed WPT. Instead, the performance is hugely dependent on Q of resonators regulated by the chosen slot area. These findings allow the conceptualization of systematic analysis of WPT systems and the development of design schemes that are readily realizable, and they also enable significant improvement in power transfer efficiency (PTE). The developed prototypes conforming to the industrial, scientific, and medical frequency bands show an enhancement in PTE to the extent of 11% during the measurements. The proposed analysis and design approach are very important steps in advancing state-ofthe-art radio-frequency WPTs. In essence, this has the potential to reinvigorate the stagnated SGP-based WPT systems so as to facilitate the requirements of low-power applications.

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“…In order to enhance the efficiency of the WPT system for medical uses, a negative impedance converter (NIC) based on the non-foster theory was presented in [64]. The presented converter consists of the transistor, voltage divider, capacitor, and inductor achieving a 96% efficiency.…”

Section: Implantmentioning

confidence: 99%

A Literature Survey with the Focus on Magnetically Coupled Wireless Power Transfer Systems Developed for Engineering and Biomedical Applications

2023

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Wireless power transfer (WPT) is the transmission of electrical energy to other external/internal devices without the need for wire connection. Such a system is useful to power electrical devices as a promising technology for various emerging applications. The implementation of devices integrated with WPT alters the existing technologies and enhance the theoretical concept for future works. Over the last decade, various studies have been conducted on the applications of magnetically coupled WPT systems, where a general overview over such devices would be beneficial. Hence, this paper presents a comprehensive review over various WPT systems developed for commercially existing applications. The importance of WPT systems was first reported from the engineering point of view, followed by their uses in biomedical devices.

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Highly Efficient WPT System With Negative Impedance Converter for Q-factor Improvement

Cited by 17 publications

References 36 publications

Minimum Power Input Control for Class-E Amplifier Using Depletion-Mode Gallium Nitride High Electron Mobility Transistor

Minimum Power Input Control for Class-E Amplifier Using Depletion-Mode Gallium Nitride High Electron Mobility Transistor

A Comprehensive Analysis, Design, and Experimental Evaluation of Single-Loop Polygonal Slotted RF Resonators and WPT Systems

A Literature Survey with the Focus on Magnetically Coupled Wireless Power Transfer Systems Developed for Engineering and Biomedical Applications

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