A5054121522- Wireless Power Transfer Systems
- Energy Harvesting in Wireless Networks
- Advanced DC-DC Converters
- Wireless Body Area Networks
- Advanced Power Amplifier Design
- Antenna Design and Analysis
- GaN-based semiconductor devices and materials
- Innovative Energy Harvesting Technologies
- Advanced Battery Technologies Research
- RFID technology advancements
- Full-Duplex Wireless Communications
Shanghai University
2025
Shanghai Jiao Tong University
2019-2023
Institute of Electrical and Electronics Engineers
2021
Delft University of Technology
2021
This article develops explicit design of an impedance matching network (IMN) to enhance the robustness megahertz (MHz) wireless power transfer (WPT) systems against variations in their final load and coil coupling. Unlike existing trial-and-error-based solutions, analytical derivations are conducted calculate parameters a two-port T- or <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\bf...
This article proposes a comprehensive approach to address the challenges posed by simultaneously varying dc load and coil coupling in drone wireless charging, which inevitably occur during battery charging landing positioning. The combination of two new designs, quasi-elliptic transmitting (Tx) "belt" receiving (Rx) coil, enables adequate power transfer at megahertz (e.g., 6.78 MHz) over large circular area. on-board Rx (5.8 g) especially helps achieve lightweight minimize air resistance. A...
Wireless power transfer (WPT) systems operating at several MHz are known to be advantageous for realizing high spatial freedom of and compact lightweight designs. The combined use multiple transmitting (Tx) coils magnetic field shaping is expected further increase the freedom. This article studies an extendable planar Tx-coil array architecture. architecture provides new conveniences WPT efficiently charge devices in 3D space. Time-domain phasor-domain modelings carried out turn analyze...
At present, mobile energy storage technology (mainly batteries) is still far from satisfactory. For instance, the specific of gasoline (~12,432 Wh/kg) hundreds times that a mass-market battery (20-200 . Quite unlike computational power predicted by Moore's law, improvement in density much slower, basically following linear trend. In addition to density, reliability, weight, and cost are also major impediments widespread use electronic devices (e.g., cellphones, wearable devices, medical...
In megahertz (MHz) wireless power transfer (WPT) systems, a varying reflected reactance due to changing final load deteriorates the overall system performance, such as efficiency and output voltage stability. This article aims achieve compact robust MHz WPT working over wide range of load. A novel concept compression design is proposed compress variation through positioning "reactance window." Efficient receiving-side parameter procedures are then developed best satisfy maximum requirement...
It is known that megahertz (MHz) wireless power transfer (WPT) particularly beneficial in terms of spatial freedom and circuit compactness. Meanwhile, design complexity a main obstacle to the spread MHz WPT. In this article, new modular concept proposed conveniently reconfigure WPT system for different applications. Multiple predesigned functional unit modules can easily be combined form complete with level distance. A vertically stacked architecture especially chosen save space actual...
The megahertz (MHz) operating frequency increases the spatial freedom, making it more suitable for multi-receiver wireless power transfer (WPT) scenarios. Generally, in a single-receiver WPT system, similar shapes (e.g. spiral) of transmitting coil and receiving help to improve cross coupling. However, cases, traditional spiral coils limit maximum number receivers, coupling varies obviously as position changes. This paper proposes hybrid coupler (Tx) solenoid (Rx) coils, which can...
There are 2 wireless power standards for the mobile device market: Qi standard and AirFuel with frequencies of hundreds kHz 6.78 MHz. This paper presents a dual-band transmitter operating at both 200 A reconfigurable PA Class E half-bridge modes is introduced to decrease size transmitter. Meanwhile, eddy current loss model parallel connected coils established provide guidance coil design. Finally, charging pad specially designed "decoupling ring" proposed, which can effectively reduce extra...
This paper presents a new circuit architecture and design of megahertz wireless power transfer (WPT) system for drones. A belt-shaped 3D receiving (Rx) coil is especially proposed that has minimized planar area but improve magnetic coupling. The saved space contributes to minimize the impact original aerodynamics employs Class E <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> topology high efficiency when operating at 6.78 MHz. In order...
The kHz WPT can achieve high efficiency under a medium or strong coupling due to its low conduction and switching losses. This paper focus on how shape magnetic field at through mutual-inductance-method instead of BiotSavart Law. necessarity applying specific phase differences between currents some occasions is verified. A more explicit appropriate measurement standard adopted demonstrate the shaping effect. Phasor-domain modeling mutual inductance mainly carried out analyze power¬receiving...
High frequency DC-DC converters working at megahertz (MHz) are promising candidates for making compact, highly efficient with galvanic isolation. However, it is challenging when requiring the system design of different final loads and voltage ratios. In this paper, a method proposed to adjust ratio Class E <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> converter by only changing capacitors. experimental 6.78 MHz works overall efficiency...
Class E power amplifier with finite inductor has become a research trend in Multi-MHz wireless transfer system design due to its high load variation adaptability. In order improve compactness of amplifier, this paper proposes method that makes full use PCB, called "edge inductor". Meanwhile, flexible magnetic sheet is used as "magnetic coating" achieve the shielding effect edge inductor. Through simulation and comparison, feasibility verified. Finally, WPT implemented using design....
Nowadays most consumer electronic devices support wireless power transfer, and currently, the major transport standard is Qi standard, working frequency kHz. With requirement in spatial freedom, mature theoretical foundation, transfer system works MHz developed. Thus a that could both frequencies presented this paper.Amplifier typology analysis, ferrite influence on coil with on, redesigned coupling coils are presented. An experiment used to verify dual-band system. It supports kHz charging...
Traditionally, the theoretical model of a coil is considered to be an ideal inductance in series with resistor. The ability wireless power transfer (WPT) system wirelessly assessed by Q value, which ratio between imaginary part and real input impedance, describing relationship amount transferred loss. However, as working frequency increases, traditional does not seem fit impedance characteristic well. In this work, theory one-port black-box circuit are firstly discussed then novel based on...
Compact, isolated DC-DC converters are required in many applications such as communication terminals. This paper presents a compact, planar Class E2 converter via wireless inductive coupling. For high frequency working at megahertz (MHz), it is challenging to design the system parameters under condition of different final loads and voltage ratios. In this paper, method proposed adjust ratio without changing turn coils. An experimental 6.78 MHz with flexible built, coupling coefficient k=0.33...
Wireless power transfer (WPT) system working at megahertz (MHz) is a research trend due to its structure flexibility. However, the reactance variation caused by non-negligible influence of switches' parasitic capacitor and practical load change will decrease reliability degrade performance, such as zero voltage switch (ZVS) condition, efficiency constant source feature. In this paper, compression design method achieved rectifier input impedance analysis detailed introduced principle....
Compact, isolated dc-dc converters are required in many applications such as communication terminals. This paper proposes a converter which effectively combined the traditional buck/boost and current source class D topology by removing dc bus capacitor output filter inductor, with operation frequencies of 500 kHz 6.78 MHz. 81.6% peak efficiency is achieved voltage ratio adjustable. Meanwhile, galvanic isolation realized through air-core coupling coils covered magnetic sheet.
The wireless power transfer (WPT) systems operating at MHz are known to be advantageous thanks their small size and a high tolerance for coil misalignment. Magnetic field (B-field) shaping technology in WPT enables control of the magnetic flux particular location, thereby further improving positional freedom with efficiency. Most use 3D transmitting structure. Besides, current research work lacks simple, intuitive, low-cost method show effect. This paper proposes planar multi-coil...
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