A 3D resonant wireless charger for a wearable device and a mobile phone

Kuo, Ron-Chi; Riehl, Patrick; Satyamoorthy, Anand; Plumb, William; Tustin, Philip F.; Lin, Jenshan

doi:10.1109/wpt.2015.7140169

Cited by 16 publications

(6 citation statements)

References 6 publications

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“…In [19] and [20], mutual inductances between Tx coils are eliminated by using orthogonal coils. To achieve this goal, Tx coil pairs ought to be geometrically symmetrical.…”

Section: Coil Structurementioning

confidence: 99%

“…Defining Tx coil resistance ratio λ = R TX2 / R TX1 , combing (20) and (24), optimal system output efficiency η Kv_OPT can be derived as:…”

Section: Efficiency Optimization In Metal Environmentmentioning

confidence: 99%

“…In a confined sensor scenario, stable, easy-to-install and controllable power transmission is important. Similar work has been conducted in [13][14][15]20], but such problems have not been resolved.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and design of a novel cubic WPT system in a metal environment for an enclosed sensor scenario

Liang

Yuan

Zhang

et al. 2023

IET Power Electronics

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This paper proposes a novel cubic WPT system for an enclosed sensor scenario, and its transmission characteristics in a metal environment have been analyzed. In addition, stable and high transmission efficiency can be normally achieved in all positions. The proposed quasi‐double D coil structure is composed of two pairs of transmitting coils; each transmitting coil pair is placed face to face and connected serially. Through current amplitude modulation, magnetic flux can flow towards the centre of the receiving coil and keep the system high efficiency when the rotation angle of the receiving coil changes. However, the installation position of the receiving coil is not fixed in the switch cabinet application, and an irregular iron wall and the metal shell of sensors could also lead to inconsistent iron loss of multiple transmitters. To overcome the resulting disturbances in efficiency, the improved current amplitude control method and the optimal load have been theoretically deduced in the case of the position variation of the receiving coil in a metal environment. Finally, experimental results in two‐dimensional space verify the omnidirectional transmission capability of the proposed quasi‐double D coil, and efficiency disturbances are effectively alleviated.

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“…In [19] and [20], mutual inductances between Tx coils are eliminated by using orthogonal coils. To achieve this goal, Tx coil pairs ought to be geometrically symmetrical.…”

Section: Coil Structurementioning

confidence: 99%

“…Defining Tx coil resistance ratio λ = R TX2 / R TX1 , combing (20) and (24), optimal system output efficiency η Kv_OPT can be derived as:…”

Section: Efficiency Optimization In Metal Environmentmentioning

confidence: 99%

See 1 more Smart Citation

Analysis and design of a novel cubic WPT system in a metal environment for an enclosed sensor scenario

Liang

Yuan

Zhang

et al. 2023

IET Power Electronics

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show abstract

“…Inductive coupling technologies have been actively researched for electric vehicles [24] and small electronic devices, including a wireless power system for mobile phones [25], a system for metal-cover smartphone applications [26], a charger for wearable devices [27], a battery-to-battery wireless system [28], and a bowlshaped transmitting coil for hearables and wearables [29]. However, there has been no technical analysis of the heat dissipation effect of the receiver coil.…”

Section: Introductionmentioning

confidence: 99%

Receiver coil built into belt for heat dissipation of watch-type smart devices

Kashiwazaki

Hachiya

Kanamoto

et al. 2022

IEICE Electron. Express

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This letter proposes a novel method to promote the heat dissipation of watch-type smart devices by using receiver coils for wireless charging. It is achieved by embedding a spiral coil inside the belt. The heat dissipation effects of the proposed method on temperatures at key hot spots are clarified. The power transfer efficiency is also clarified. In watch-type smart devices, the most critical part for temperature is the underside surface of the belt, since this is the part that touches the skin for a long time. The analysis results show that the proposed method can reduce the increase in ambient temperature at the belt's underside surface by 59.7% and that its power transfer efficiency is more than 90%.

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“…Three-dimensional structures have also been discussed, for example, a bowl-shaped transmitter coil [17]. The three-dimensional resonant cavity has been discussed, offering an effective way of charging multiple devices simultaneously, such as devices implanted in a freely moving animal [18], charging a mobile phone and a watch [19], and LEDs [20]. Helical-type coils made of superconductors are presented to increase the quality LEDs [20].…”

Section: Introductionmentioning

confidence: 99%

Free Angular-Positioning Wireless Power Transfer Using a Spherical Joint

Houran

Yang

2018

Energies

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Many studies have investigated resonator structures and winding methods. The aims of this paper are as follows. First, the paper proposes an optimized winding model for a bio-inspired joint for a wireless power transfer (WPT) system. The joint consists of a small spherical structure, which rotates inside a hemispherical structure. The transmitter coil (Tx) is wound on the hemisphere structure, and the receiver coil (Rx) is wound on the small sphere. The power is transferred while rotating Rx over a wide range of angular misalignment. In addition, the algorithm design of the proposed winding method is given to get an optimized model. Moreover, the circuit analysis of the WPT system is discussed. Second, the magnetic field density is investigated considering a safety issue, which is linked to human exposure to electromagnetic fields (EMFs). Moreover, EMF mitigation methods are proposed and discussed in detail. Finally, the simulation results are validated by experiments, which have confirmed that the proposed winding method allows the system to rotate up to 85 degrees and achieve an efficiency above 86%. The proposed winding method for the WPT system can be a good technique for some robotic applications or a future replacement of the human joint.

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A 3D resonant wireless charger for a wearable device and a mobile phone

Cited by 16 publications

References 6 publications

Analysis and design of a novel cubic WPT system in a metal environment for an enclosed sensor scenario

Analysis and design of a novel cubic WPT system in a metal environment for an enclosed sensor scenario

Receiver coil built into belt for heat dissipation of watch-type smart devices

Free Angular-Positioning Wireless Power Transfer Using a Spherical Joint

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