A study on geometry effect of transmission coil for micro size magnetic induction coil

Lee, Kyung Hwa; Jun, Byoung Ok; Kim, Seunguk; Lee, Gwang Jun; Ryu, Mingyu; Choi, Ji-Woong; Jang, Jae Eun

doi:10.1016/j.sse.2016.02.008

Cited by 8 publications

(3 citation statements)

References 16 publications

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“…To apply wireless charging to micro and precision fields, this article introduces the concept of micro coils and simulates the entire wireless charging system. The micro coil is a concept that involves miniaturizing the size of transmitting and receiving coils in ordinary electromagnetic induction wireless charging, especially the receiving coil in this simulation experiment [13]. In this test, the size of the receiving coil is miniaturized to a radius length of about 1 mm, enabling the installation of receiving coils of this size in electronic equipment of almost any size and shape, thus solving the problem of applying wireless charging technology to the field of micro precision [14].…”

Section: Introductionmentioning

confidence: 99%

A Novel Method of Wireless Micro Energy Transmission Based on MEMS Micro Coil

Wang,

Yi,

Meng

et al. 2023

Micromachines

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Based on current implantable devices, a battery’s rigidity and large size makes it prone to immune rejection and wound incisions. Additionally, it is limited by its finite lifespan, which hinders long-term usage. These limitations greatly restrict the development of implantable medical device systems towards miniaturization and minimally invasive approaches. Consequently, obtaining high-fidelity and stable biological signals from the target tissue area of the organism remains challenging. Therefore, there is a need to develop wireless power transmission technology. In this paper, we propose a wireless micro energy transfer method based on MEMS micro coils for charging implantable devices. Through simulation calculations, we first investigate the influence of coaxial distance, horizontal displacement, and rotation angle between the MEMS micro coil and the transmitting coil on power transmission. Subsequently, we utilize micro nanofabrication technology to create a MEMS micro spiral copper coil with a line width, thickness, and spacing of 50 µm and a total of five turns. Finally, we conduct wireless power transmission tests on the coil. The results show that, when the transmitting coil and the receiving coil are 10 mm apart and the operating frequency is 100 kHz, the power of the wireless power transmission system reaches 45 µW. This power level is sufficient to meet the power supply requirements of implantable pacemakers. Therefore, this technology holds great potential for applications in the field of wireless power transmission for implantable medical devices, including pacemakers and brain neurostimulators.

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Section: Introductionmentioning

confidence: 99%

A Novel Method of Wireless Micro Energy Transmission Based on MEMS Micro Coil

Wang,

Yi,

Meng

et al. 2023

Micromachines

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“…Very small size antennas have been proposed for various new device systems. [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ] Such antennas are essential components in certain devices such as microrobots. [ 10 ] In addition to a single antenna, multi‐array antenna designs can be easily led to various new application concepts because of their small effective size.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized Self‐Resonant Micro Coil Array with A Floating Structure for Wireless Multi‐Channel Transmission

et al. 2021

Self Cite

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Micro size antennas have significant merits due to the small size effect, enabling new device concepts. However, the low-quality factor (Q-factor), the large size of impedance matching components, and the poor selectivity of the multi-array design remain challenging issues. To solve these issues, a floating coil structure stacked on a loop micro-antenna is suggested. Various floating coil designs are prepared with appropriate matching conditions at specific target frequencies, using an easy fabrication process without the need for additional space. A simple one-loop antenna design shows a higher Q-factor than other, more complicated designs. The micro-sized loop antenna with the 80 μm trace width design exhibits the highest Q-factor, around 31 within 7 GHz. The 8 different floating coil designs result in high-frequency selectivity from 1 to 7 GHz. The highest selectivity contrast and WPT efficiency are above 7 and around 1%, respectively. Considering the size of the antenna, the efficiency is not low, mainly due to the good matching effect with the high Q-factor of the floating coil and the loop antenna. This micro-antenna array concept with high integration density can be applied for advanced wireless neural stimulation or in wireless pixel array concepts in flexible displays.

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“…In mobile robot applications, battery charging is seen as a bottleneck problem. Wireless power transfer (WPT) technology can provide a flexible, safe, and convenient way to power the robot [1][2][3][4][5][6]. WPT technology utilizes a magnetic field to transfer energy between two loosely-coupled coils, which can enhance the mobility and reliability of the robots and operate under harsh environments such as humid, high-temperature, dirty, and corrosive environment [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A Phase-Shifted Control for Wireless Power Transfer System by Using Dual Excitation Units

Dai

Jiang

et al. 2017

Energies

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Wireless power transfer (WPT) technology can provide intelligent robots with a flexible, robust, and safe power supply, especially in very harsh environments including high humidity and high temperature. To meet increasing power requirement for robotic applications, this paper proposes a novel method to increase system power transfer capability without increasing voltage and current stress, realized by using dual excitation units at the primary side. On this basis, this paper proposes a phase-shifted control method for output power regulation which can keep efficiency high. At the same time, the system is proved to have a better output robust characteristic by analysis under the condition of parameter variation. Finally, experimental results show the proposed dual excitation units (DEU)-WPT system can increase output power by at least three times compared to classical WPT system, and the efficiency is improved by 9%. Figure 1. Dual excitation unit wireless power transfer (DEU-WPT) system.The equivalent circuit of the circuit model is shown in Figure 2, where L p1 , L p2 are primary coil and L s are secondary coil inductance, respectively. C p1 , C p2 , and C s are the resonant capacitance. i p1 , i p2 are resonant currents in the coil. u p1 and u p2 are resonant voltage at the primary side. Z 1 and Z 2 are the reflection impedance. C o is the capacitance of rectifier circuit, and R L is the equivalent load resistance.

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A study on geometry effect of transmission coil for micro size magnetic induction coil

Cited by 8 publications

References 16 publications

A Novel Method of Wireless Micro Energy Transmission Based on MEMS Micro Coil

A Novel Method of Wireless Micro Energy Transmission Based on MEMS Micro Coil

Miniaturized Self‐Resonant Micro Coil Array with A Floating Structure for Wireless Multi‐Channel Transmission

A Phase-Shifted Control for Wireless Power Transfer System by Using Dual Excitation Units

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