High-Efficiency Wireless Power Transfer for Biomedical Implants by Optimal Resonant Load Transformation

Xue, Rui-Feng; Cheng, K.-K.M.; Je, Minkyu

doi:10.1109/tcsi.2012.2209297

Cited by 304 publications

(163 citation statements)

References 24 publications

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“…The quality factor as a definition-the ratio of stored energy to the lost energy-is a valid implicit indication for the efficiency of a circuit. Referred to our parallel-compensated WPT receiver, it is well known that the power transfer link efficiency can be given in terms of the quality factor as [7]:…”

Section: Efficiency and Quality Factormentioning

confidence: 99%

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Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators

Saad

Alarcón

2018

Energies

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Magnetic-resonant wireless power transfer (WPT) has become a reliable contactless source of power for a wide range of applications. WPT spans different power levels ranging from low-power implantable devices up to high-power electric vehicles (EV) battery charging. The transmission range and efficiency of WPT have been reasonably enhanced by resonating the transmitter and receiver coils at a common frequency. Nevertheless, matching between resonance in the transmitter and receiver is quite cumbersome, particularly in single-transmitter multi-receiver systems. The resonance frequency in transmitter and receiver tank circuits has to be perfectly matched, otherwise power transfer capability is greatly degraded. This paper discusses the mistuning effect of parallel-compensated receivers, and thereof a novel dynamic frequency tuning method and related circuit topology and control is proposed and characterized in the system application. The proposed method is based on the concept of switch-mode gyrator emulating variable lossless inductors oriented to enable self-tunability in WPT receivers.

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Section: Efficiency and Quality Factormentioning

confidence: 99%

“…Considering the simple topology of capacitor-compensated coils, it has been found that the WPT link efficiency is a function of the quality factor Q at the transmitter and receiver circuit [7]. Consequently, the design of high-Q resonant circuits is preferred in terms of efficiency.…”

Section: Introductionmentioning

confidence: 99%

Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators

Saad

Alarcón

2018

Energies

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“…The problem of wireless power transfer between coupled coils was analyzed in many papers, for example in [3][4][5][6][7][8]. The G. Blakiewicz, J. Jakusz, W. Jendernalik, and S. Szczepański…”

Section: Introductionmentioning

confidence: 99%

“…The problem of a proper selection of a tuning circuit for biomedical sensors is further complicated by the need to obtain small size, and a requirement to work with a rectifier. Several types of tuning circuits for adaptation to changes in coil position were proposed in [3,[5][6][7][8]. Although the proposed solutions improve the transmission efficiency, they have certain limitations.…”

mentioning

confidence: 99%

“…Another tuning circuit, presented in [5] cannot work with certain rectifiers, because the circuit uses a matrix of capacitors that blocks flow of DC current required for proper operation of the rectifier. The solution [6] allows only for a limited adjustment to specified distance between transmitting and receiving coils, and therefore has a limited range of effective application. The other variants [7,8] only use frequency tuning, which considerably limits possibility of obtaining high efficiency of power transmission.…”

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confidence: 99%

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Automatic tuning of a resonant circuit in wireless power supply systems for biomedical sensors

Blakiewicz¹,

Jakusz²,

Jendernalik³

et al. 2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. In this paper, a tuning method of a resonant circuit suited for wireless powering of miniature endoscopic capsules is presented and discussed. The method allows for an automatic tuning of the resonant frequency and matching impedance of a full wave rectifier loading the resonant circuit. Thereby, the receiver tunes so as to obtain the highest power efficiency under given conditions of transmission. A prototype receiver for wireless power reception, fabricated in in AMS CMOS 0.35 µm technology, was used to verify correct operation of the proposed tuning. The prototype system produces a stable supply voltage, adjustable in the range of 1.2-1.8 V at a maximum output current of 100-67 mA, which is sufficient to power a typical endoscopic capsule. results of detailed analysis and experimental measurements show that with large changes of coupling, tuning of the resonant frequency and impedance adjustment must be applied in order to achieve sufficiently high efficiency of power transmission. The problem of a proper selection of a tuning circuit for biomedical sensors is further complicated by the need to obtain small size, and a requirement to work with a rectifier. Several types of tuning circuits for adaptation to changes in coil position were proposed in [3,[5][6][7][8]. Although the proposed solutions improve the transmission efficiency, they have certain limitations. For example, the solution [3] requires changes in distance between a coil and its coupling winding, which makes miniaturization impossible. Another tuning circuit, presented in [5] cannot work with certain rectifiers, because the circuit uses a matrix of capacitors that blocks flow of DC current required for proper operation of the rectifier. The solution [6] allows only for a limited adjustment to specified distance between transmitting and receiving coils, and therefore has a limited range of effective application. The other variants [7,8] only use frequency tuning, which considerably limits possibility of obtaining high efficiency of power transmission. In this paper the most difficult case, namely the wireless power transmission to an endoscopic capsule is considered. In this way, the proposed solution might find much wider application, both for powering the capsules as well as powering simpler devices while providing higher transmission efficiency than was previously possible to achieve. Furthermore, the tuning circuit can work with all types of rectifiers and can be largely miniaturized. In Section 2 conditions of power transmission to endoscopic capsules are outlined and discussed. The proposed tuning method and a tunable receiver for wireless power reception are presented in Section 3. In the next section results of measurements of an integrated prototype circuit are given. The final conclusions are summarized in the last section.

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Inductive Power Transmission Systems

Kiani

Ghovanloo

2016

Wiley Encyclopedia of Electrical and Electronics Engineering

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Powering up and recharging a variety of mobile devices, such as implantable medical devices (IMD), smartphones, and electric vehicles, are governed by the same fundamental principles of near‐field inductive coupling, which guide the design constraints and practical considerations of inductive power transmission described in this article. The coupling coefficient and power transmission efficiency (PTE) of an inductive link, which are affected by important geometrical and circuit design parameters on both transmitter (Tx) and receiver (Rx) sides, are discussed. The inductive link PTE has been modeled based on the reflected load theory, indicating that the mutual coupling between the coils has the most significant effect on the PTE, followed by the primary and secondary coils' quality factors. To these factors, one should add the load resistance, source resistance, carrier frequency, and the surrounding environment. Three and four‐coil inductive links have been utilized as a way to achieve optimal loading condition and to reduce the negative effect of load/source resistances on the PTE. This article also includes an optimization method for the wireless links that are made of printed spiral coils (PSC), which are suitable for IMDs and radio‐frequency identification (RFID) applications.

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High-Efficiency Wireless Power Transfer for Biomedical Implants by Optimal Resonant Load Transformation

Cited by 304 publications

References 24 publications

Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators

Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators

Automatic tuning of a resonant circuit in wireless power supply systems for biomedical sensors

Inductive Power Transmission Systems

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