Journal ArticleDOI
Modeling and Optimization of Class-E Amplifier at Subnominal Condition in a Wireless Power Transfer System for Biomedical Implants.
Hao Liu,Qi Shao,Xuelin Fang +2 more
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TLDR
The design parameters of class-E amplifier in a WPT system for biomedical implants can be determined with the proposed optimization method in this paper.Abstract:
For the class-E amplifier in a wireless power transfer (WPT) system, the design parameters are always determined by the nominal model. However, this model neglects the conduction loss and voltage stress of MOSFET and cannot guarantee the highest efficiency in the WPT system for biomedical implants. To solve this problem, this paper proposes a novel circuit model of the subnominal class-E amplifier. On a WPT platform for capsule endoscope, the proposed model was validated to be effective and the relationship between the amplifier's design parameters and its characteristics was analyzed. At a given duty ratio, the design parameters with the highest efficiency and safe voltage stress are derived and the condition is called 'optimal subnominal condition.' The amplifier's efficiency can reach the highest of 99.3% at the 0.097 duty ratio. Furthermore, at the 0.5 duty ratio, the measured efficiency of the optimal subnominal condition can reach 90.8%, which is 15.2% higher than that of the nominal condition. Then, a WPT experiment with a receiving unit was carried out to validate the feasibility of the optimized amplifier. In general, the design parameters of class-E amplifier in a WPT system for biomedical implants can be determined with the proposed optimization method in this paper.read more
Citations
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Journal ArticleDOI
Wireless Power Transfer—An Overview
TL;DR: This paper presents an overview of WPT techniques with emphasis on working mechanisms, technical challenges, metamaterials, and classical applications, and discusses about future development trends.
Journal ArticleDOI
An Improved Wearable Resonant Wireless Power Transfer System for Biomedical Capsule Endoscope
TL;DR: An efficient WPTS that tremendously improves the power transfer efficiency (PTE) and enriches the received power stability (RPS) is proposed and the performance of the proposed designs greatly outweighs the previous designs.
Journal ArticleDOI
Wireless Power Transfer Techniques for Implantable Medical Devices: A Review.
TL;DR: The various strategies implemented to transfer wireless power in implantable medical devices (IMDs) were reviewed, which includes capacitive coupling, inductive coupling, magnetic resonance coupling and, more recently, acoustic and optical powering methods.
Journal ArticleDOI
Analysis, Design, and Implementation of WPT System for EV's Battery Charging Based on Optimal Operation Frequency Range
TL;DR: An optimal operation frequency range (OOFR) where the wireless power transfer (WPT) system can realize the required output and ZVS operation of inverter simultaneously without extra dc–dc converters is presented.
Journal ArticleDOI
Phase-Locked Loop Combined With Chained Trigger Mode Used for Impedance Matching in Wireless High Power Transfer
TL;DR: In this article, a phase-locked loop combined with the chained trigger mode (PLL-CTM) is proposed to achieve high accuracy in steady state and high dynamic performance with the step change.
References
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Class E-A new class of high-efficiency tuned single-ended switching power amplifiers
Nathan O. Sokal,Alan D. Sokal +1 more
TL;DR: In this article, a load network is synthesized to have a transient response which maximizes power efficiency even if the active device switching times are substantial fractions of the a.c. cycle.
Journal ArticleDOI
Idealized operation of the class E tuned power amplifier
TL;DR: In this paper, the Fourier series analysis of the collector voltage waveform is used to determine component values for optimum operation at an efficiency of 100 percent, and other combinations of component values and duty cycles are also determined.
Journal ArticleDOI
Design and Optimization of Resonance-Based Efficient Wireless Power Delivery Systems for Biomedical Implants
TL;DR: This work has analyzed the four-coil energy transfer systems and outlined the effect of design parameters on power-transfer efficiency, and a proof-of-concept prototype system is implemented and confirms the validity of the proposed analysis and design techniques.
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Cochlear Implants: System Design, Integration, and Evaluation
TL;DR: Issues beyond cochlear implants are discussed to address treatment options for the entire spectrum of hearing impairment as well as to use the co chlear implant as a model to design and evaluate other similar neural prostheses such as vestibular and retinal implants.
Class of High-Efficiency Tuned Switching Power Amplifiers
Nathan O. Sokal,Alan D. Sokal +1 more
TL;DR: Advantages of Class E are unusually high efficiency, a priori designability, large reduction in second-breakdown stress, low sensitivityy to activedevice characteristics, and potential for high-efficiency operation at higher frequencies than pI eviously published Class-D circuits.