An Improved Wearable Resonant Wireless Power Transfer System for Biomedical Capsule Endoscope

Basar, Md. Rubel; Ahmad, Mohd Yazed; Cho, Jongman; Ibrahim, Fatimah

doi:10.1109/tie.2018.2801781

Cited by 159 publications

(57 citation statements)

References 27 publications

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“…For example, if M 23 is controlled by the distance between coils 2 and 3, then efficiency increases with the distance, as in an ideal four-coil system. 20 Oppositely, when R 3 → 0, it can be seen that efficiency still passes through a point of maximum in terms of M 23 ; however, as shown in (18) and (19) and Figure 2, it will be lesser than ηj R 2 →0 for all values of M 23 .…”

Section: Impact Of Relay Circuit Lossesmentioning

confidence: 86%

“…Of course, the reduction of ohmic losses can also be achieved by using wires with larger diameters, or ribbons with larger width (litz wires can also be used, although proximity effect difficult its use on MHz range 18 ). However, depending on the application, the dimensions of some of the coils involved in the WPT link can be critical, as is the case of biomedical applications where usually the load circuit and one relay circuit can be implanted in biological tissue 1,12,19 . In this way, it is clear that an analysis on the impact that individual relay circuits have on the WPT system performance is necessary for its use in these important applications.…”

Section: Introductionmentioning

confidence: 99%

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On the impact of relay circuit losses in four‐coil wireless power transfer systems

Miranda

Pichorim

Abatti

2019

Circuit Theory & Apps

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In wireless power transfer (WPT) systems with more than two coils, the intermediary or relay circuits are used to extend the link distance. Thus, to achieve this extension efficiently in terms of power transfer, these relay circuits must have low losses. However, there are several instances in which there are restrictions in reducing the ohmic losses in all the relay circuits of the system. This is the case of biomedical applications where commonly there are size and access restrictions since one of the circuits can be implanted and also in applications using high-temperature superconductor (HTS) coils due to the difficulty in implementing the necessary cooling system for all the coils of the system. Therefore, in these situations, the designer need to choose which relay circuit will be optimized. In this work, it is presented an analysis on the impact that losses in individual relay circuits have on efficiency, and power transfer, of typical four-coil wireless power transfer systems consisting of circuit 1 (transmitter), relay circuits 2 and 3, and circuit 4 (load). It is shown that the losses on relay circuit 2 have greater impact on efficiency, while the losses of relay circuit 3 have a greater impact on power transfer for a given condition. Practical experiments confirm the developed analysis.

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Section: Impact Of Relay Circuit Lossesmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

On the impact of relay circuit losses in four‐coil wireless power transfer systems

Miranda

Pichorim

Abatti

2019

Circuit Theory & Apps

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“…The wireless power transfer (WPT) technology can be applied to power or charge an active implantable medical device (AIMD). With this technology, the power can be transferred from the on-body transmitter to the in-body AIMD equipped with a receiver [1][2][3][4][5][6][7][8][9][10]. There are mainly two different approaches for this kind of application.…”

Section: Introductionmentioning

confidence: 99%

“…The first one is based on the inductive coupling between two coils: the primary coil is worn by the patient, while the secondary coil is installed in the AIMD. The performance of the inductive power transfer is significantly improved using magnetic resonant coupling (MRC) between the primary and secondary coils at intermediate frequencies (IFs), i.e., 10 kHz-10 MHz [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…A possible solution to power deep implant devices by MRC is the use of a primary coil with large dimensions that can generate a quite uniform magnetic field in a wide part of the body as the trunk or the head [7,8]. Currently, the use of large primary coils is applied to power only capsule endoscopes, which are characterized by low power and motion.…”

Section: Introductionmentioning

confidence: 99%

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Near Field Wireless Powering of Deep Medical Implants

et al. 2019

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This study deals with the inductive-based wireless power transfer (WPT) technology applied to power a deep implant with no fixed position. The usage of a large primary coil is here proposed in order to obtain a nearly uniform magnetic field inside the human body at intermediate frequencies (IFs). A simple configuration of the primary coil, derived by the Helmholtz theory, is proposed. Then, a detailed analysis is carried out to assess the compliance with electromagnetic field (EMF) safety standards. General guidelines on the design of primary and secondary coils are provided for powering or charging a deep implant of cylindrical shape with or without metal housing. Finally, three different WPT coil demonstrators have been fabricated and tested. The obtained results have demonstrated the validity of the proposed technology.

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Wireless power transfer system with dual‐frequency operation in transmitter side for motor control application

Büyük

2022

Circuit Theory & Apps

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In this paper, a transmitter‐side control method is proposed in inductive wireless power transfer (I‐WPT) model for the speed and power control of a single‐phase induction motor (SPIM). Resonant tanks with an electronic driving mechanism are used in the proposed configuration. The receiver side employs two resonant circuits with two full wave rectifiers, comparator, and two gate drivers for the management of the motor speed and power. The resonant circuits and electronic motor drive are presented through detailing the mathematical model and system design. In addition, a comparative section of the proposed model with the previous art is introduced to address the contributions of the paper. Moreover, a prototype model of the proposed topology has been created in simulation environment and tested in a variety of scenarios. The proposed I‐WPT model has a power rating of 140 W, whereas the SPIM has a power rating of 120 W. At full power operation, a 130 W power is supplied from the source during 118 W power consumption of SPIM, indicating that the system's efficiency is over 90%. The motor speed control has been tested by lowering the operation frequency of the motor terminal voltage from 60 to 40 Hz and from 40 to 20 Hz. The dynamic motor power has been also analyzed by reducing the load power from 100% to 70%. The findings reveal that the proposed transmitter‐side controlled I‐WPT system operates in a wide range of circumstances.

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An Improved Wearable Resonant Wireless Power Transfer System for Biomedical Capsule Endoscope

Cited by 159 publications

References 27 publications

On the impact of relay circuit losses in four‐coil wireless power transfer systems

On the impact of relay circuit losses in four‐coil wireless power transfer systems

Near Field Wireless Powering of Deep Medical Implants

Wireless power transfer system with dual‐frequency operation in transmitter side for motor control application

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