Wireless Power Charger Based on Class E Amplifier with the Maximum Power Point Load Consideration

Dai, Weili; Tang, Wei; Deng, Lihua; Zhang, Xiaofeng

doi:10.3390/en11092378

Cited by 8 publications

(7 citation statements)

References 22 publications

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“…By comparing Equations (4) and (5), one can express the equivalent network elements and values by the original ones…”

Section: Simulations On Multiple Receiversmentioning

confidence: 99%

“…One reason is the wide variety of applications. It ranges from consumer products like electric tooth brushes and charging of mobile phones to high end medical applications [1][2][3][4][5] like cochlear implants [6], wireless endoscopic capsules [7,8], and cardiac pacemakers [9]. Recently, some effort has been put into the development of contactless charging systems for electric vehicles.…”

Section: Introductionmentioning

confidence: 99%

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A Class-E Amplifier for a Loosely Coupled Inductive Power Transfer System with Multiple Receivers

Sutor

Heining

2019

Energies

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We present a method for optimizing the electronic power system for a new type of photobioreactor or photoreactor in general. In the case of photobioreactors, photosynthetic active microorganisms or cells are grown. A novel concept for the illumination of photobioreactors was necessary, as the external illumination of those reactors leads to a limited penetration depth of light. Due to the limited penetration depth, no standard reactors can be use for cultivation, but custom made reactors with very small volume to surface ratio have to be used. This still prevents the technology from a large scale industrial impact. The solution we propose in this paper is an internal illumination via Wireless Light Emitters. This increases the manageable culture volume of photosynthetic active microorganisms or cells. The illumination system is based on floating light emitters, which are powered wirelessly by near field resonant inductive coupling. The floating light emitters are able to illuminate a photobioreactor more homogeneously than external illumination systems do. We designed a class-E amplifier and field coils to produce an intermediate frequency electromagnetic field inside the reactor. An appropriate magnetic flux density was found to be approx. B = 1 mT and the driving frequency is f = 176 kHz. We conducted experiments with a laboratory size photoreactor. The cultivation volume was 30 L containing up to 3000 WLEs. The maximum electric power input was more than 300 W and we calculated an efficiency of up to 76%.

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“…By comparing Equations (4) and (5), one can express the equivalent network elements and values by the original ones…”

Section: Simulations On Multiple Receiversmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Class-E Amplifier for a Loosely Coupled Inductive Power Transfer System with Multiple Receivers

Sutor

Heining

2019

Energies

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“…In this paper, in order to circumvent the limitation of primary parallel compensation, it was decided to feed the chosen circuit through a Class-E amplifier. The Class-E amplifier stands out for its topological simplicity and for its good performance at MHz or GHz frequencies [19]. An aggravating factor of this application lies in the fact that the Class-E amplifier is highly sensitive to parametric variations, that is small variations in the resonant elements or in the load can impair its operation [20].…”

Section: Introductionmentioning

confidence: 99%

Differential-Evolution-Assisted Optimization of Classical Compensation Topologies for 1 W Current-Fed IMD Wireless Charging Systems

de Jesus,

Tolfo,

Godoy

et al. 2023

Applied Sciences

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Implantable medical devices (IMDs) necessitate a consistent energy supply, commonly sourced from an embedded battery. However, given the finite lifespan of batteries, periodic replacement becomes imperative. This paper addresses the challenge by introducing a wireless power transfer system designed specifically for implantable medical devices (IMDs). It begins with a detailed analysis of the four conventional topologies. Following this, the paper provides a thorough explanation for choosing the PS topology, highlighting its advantages and suitability for the intended application. The primary parallel capacitance necessitates power from current sources; thus, a Class-E amplifier was implemented. Additionally, the selected circuit was engineered to deliver 1 W at the biocompatible resonance frequency of 13.56 MHz. The delineation of the resonance parameters hinges on multifaceted solutions, encompassing bifurcation-free operation and the attainment of peak efficiency. To ensure the feasibility of the proposed solution, a Differential-Evolution-based algorithm was employed. The results obtained from simulation-based evaluations indicated that the system achieved an efficiency exceeding 86%. This efficiency level was maintained even in the face of frequency fluctuations and variations in the coupling between the coils, thereby ensuring stable operational performance. This aligns seamlessly with the specified application prerequisites, guaranteeing a feasible and reliable operation.

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“…Moreover, technical considerations and future trends for EV IPT have also been introduced such as enhancing the performance in terms of efficiency, power density, scalability, and reliability, adopting soft-switching technology, using wide bandgap device technology, and applying high-performance control schemes. Among the WPT topologies, the class-E power amplifier (PA) [3,4], which is simple yet highly efficient with high operating frequencies, is critical for various devices, such as drones [5], battery chargers [6], and electronics and sensors [7,8]. As to human physiology, the resonant frequency in the range of 3.8 to 6 MHz is regarded as a safe electromagnetic frequency for the human body to be exposed to, according to the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and the Institute of Electrical and Electronics Engineers (IEEE) standards [9].…”

Section: Introductionmentioning

confidence: 99%

Derivation of the Resonance Mechanism for Wireless Power Transfer Using Class-E Amplifier

Liu

Wang

et al. 2021

Energies

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In this study, we investigated the resonance mechanism of 6.78 MHz resonant wireless power transfer (WPT) systems. The depletion mode of a gallium nitride high-electron-mobility transistor (GaN HEMT) was used to switch the states in a class-E amplifier circuit in this high frequency. The D-mode GaN HEMT without a body diode prevented current leakage from the resonant capacitor when the drain-source voltage became negative. The zero-voltage switching control was derived according to the waveform of the resonant voltage across the D-mode GaN HEMT without the use of body diode conduction. In this study, the effect of the resonant frequency and the duty cycle on the resonance mechanism was derived to achieve the highest WPT efficiency. The result shows that the power transfer efficiency (PTE) is higher than 80% in a range of 40 cm transfer distance, and the power delivered to load (PDL) is measured for different distances. It is also possible to cover different applications related to battery charging and others using the proposed design.

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Wireless Power Charger Based on Class E Amplifier with the Maximum Power Point Load Consideration

Cited by 8 publications

References 22 publications

A Class-E Amplifier for a Loosely Coupled Inductive Power Transfer System with Multiple Receivers

A Class-E Amplifier for a Loosely Coupled Inductive Power Transfer System with Multiple Receivers

Differential-Evolution-Assisted Optimization of Classical Compensation Topologies for 1 W Current-Fed IMD Wireless Charging Systems

Derivation of the Resonance Mechanism for Wireless Power Transfer Using Class-E Amplifier

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