Design of Maximum Efficiency Tracking Control Scheme for Closed-Loop Wireless Power Charging System Employing Series Resonant Tank

Yeo, Tae-Dong; Kwon, DukSoo; Khang, Seung-Tae; Yu, Jong‐Won

doi:10.1109/tpel.2016.2523121

Cited by 193 publications

(70 citation statements)

References 14 publications

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“…While according to the capacitance compensation approaches of transmit and receiving coils, the systems can be divided into four types: serial-serial (SS), serial-parallel (SP), parallel-serial (PS), and parallel-parallel (PP) ones. Therefore, through permutation and combination, there are eight types of resonant topology of MCRWPT systems [10][11]. Taking a MCRWPT system with V-source power and SS compensation topology for an example, the structure of the power supply system is shown in Figure I.…”

Section: Theoretical Modeling and Coupling Characteristics Of Thementioning

confidence: 99%

Coupling Characteristics and Optimization of the Resonators Applied to the Power Supply System of Tail-free Household Appliances

Lin¹,

Zhu²,

Xie³

2018

Proceedings of the 2018 International Conference on Computer Science, Electronics and Communication Engineering (CSECE 2018)

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As household appliances become more and more intelligent, increasingly strict demands are put forward for their power supply. Existing draw-out power supply mode of household appliances has many shortcomings including low waterproof grade, touch spark, and wire constraint. Considering this, a tail-free power supply system based on magneticallycoupled resonant wireless power transfer (MCRWPT) technology is investigated. Aiming at the coupling problems, such as frequency splitting, of the resonator during the design of the system, the analytic calculation is adopted to obtain the advisable domain values of mutual inductance that can evade frequency splitting. On this basis, the authors also carry out theoretical calculation on the combination modes of disc spiral coils and spatial spiral coils so as to attain the accurate mutual inductance between the resonators. In addition, a calculation method more accurate than the traditional Neumann formula is also proposed. The theoretical analysis is finally validated by conducting simulation and experiments and comparing the obtained results.

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Section: Theoretical Modeling and Coupling Characteristics Of Thementioning

confidence: 99%

Coupling Characteristics and Optimization of the Resonators Applied to the Power Supply System of Tail-free Household Appliances

Lin¹,

Zhu²,

Xie³

2018

Proceedings of the 2018 International Conference on Computer Science, Electronics and Communication Engineering (CSECE 2018)

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“…Traditional WPT systems are not robust against alteration of distance and misalignment between coils [5,16], and variations in the terminating impedance of an electric power grid or battery over time [1]. To date, several techniques have been proposed to optimize the efficiency of power transfer, which include dynamic adjustment of operating frequency (resonant-frequency tracking) [17,18], combination of multiple receivers and repeaters for adaptive impedance matching [19], and adding nonlinear tuning elements in circuits [7,10]. For these often used WPT schemes, when the coupling factor (as a function of distance and alignment between coils) changes, the operating frequency must be adjusted accordingly to maintain a high transfer efficiency [20,21].…”

Section: Introductionmentioning

confidence: 99%

Robust extended-range wireless power transfer using a higher-order PT-symmetric platform

Sakhdari

Hajizadegan

Chen

2020

Phys. Rev. Research

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A fundamental challenge for the nonradiative wireless power transfer (WPT) resides in maintaining the stable power transmission with a consistently high efficiency under dynamic conditions. Here, we propose and experimentally demonstrate that a frequency-locked WPT system satisfying the higher-order parity-time (PT) symmetry can achieve a near-unity power transfer efficiency that is resilient to effects of distance variation and misalignment between coils, and impedance fluctuations in electric grids. In specific higher-order PT electronic systems, a purely real-valued and coupling-invariant (nonbifurcated) eigenfrequency would enable the robust and efficient wireless charging without frequency hopping or adaptive impedance matching, even for midrange operation. We envision that this WPT technique may provide reliable, fast and efficient power delivery for a variety of consumer electronics, electric vehicles, and medical devices.

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“…Therefore this work focuses on the AirFuel standard. Gallium nitride (GaN) devices are used in [12], [15], [18] to reduce switching losses on the Tx side. Synchronous rectifiers, typically used in high power applications [23], [24], address the conduction losses on the Rx side in [3], [7], [13].…”

Section: Introductionmentioning

confidence: 99%

Resonant full-bridge synchronous rectifier utilizing 15 V GaN transistors for wireless power transfer applications following AirFuel standard operating at 6.78 MHz

Jensen

Spliid

Hertel

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-Connectivity in smart devices is increasingly realized by wireless connections. The remaining reason for using connectors at all is for charging the internal battery, for which wireless power transfer is an alternative. Two industry standards, AirFuel and Qi, exist to support compatibility between devices. This work is focusing on the AirFuel standard, as it is operating at a higher frequency (6.78 MHz), than the Qi standard, and therefore allows smaller passive components, including the coupling coils. Whereas gallium-nitride (GaN) devices are being widely used on the transmitter (Tx) side, this work uses low voltage GaN transistors on the receiver (Rx) side to allow synchronous rectification and soft switching, thereby achieving high efficiency. After analyzing adequate Class-DE rectifier topologies, a Class-DE full-bridge 5 W rectifier using 15 V GaN transistors are designed and implemented. The experimental results show an efficiency above 80 % over a wide operating range and a peak efficiency of 89 %, at an arbitrary alignment of Tx and Rx coils with 3 cm distance between them.

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Design of Maximum Efficiency Tracking Control Scheme for Closed-Loop Wireless Power Charging System Employing Series Resonant Tank

Cited by 193 publications

References 14 publications

Coupling Characteristics and Optimization of the Resonators Applied to the Power Supply System of Tail-free Household Appliances

Coupling Characteristics and Optimization of the Resonators Applied to the Power Supply System of Tail-free Household Appliances

Robust extended-range wireless power transfer using a higher-order PT-symmetric platform

Resonant full-bridge synchronous rectifier utilizing 15 V GaN transistors for wireless power transfer applications following AirFuel standard operating at 6.78 MHz

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