Loop Switching Technique for Wireless Power Transfer Using Magnetic Resonance Coupling

Kim, Jungsik; Choi, Wonseok; Jeong, Jinho

doi:10.2528/pier13012118

Cited by 40 publications

(25 citation statements)

References 17 publications

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“…The contactless power and data simultaneous transmission system that uses two pairs of coils: one pair for a power transfer and another one for the data transmission, is shown in [13,14]. The adopted solution is based not only on separated coils for power and information transmission, but also on using a coil with special geometry for the data transmission.…”

Section: Introductionmentioning

confidence: 99%

Wireless power transfer impact on data channel

Baikova

Valtchev

Melício

et al. 2016

2016 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)

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Abstract-This paper presents measurement results and analysis of the interference produced by the high-power electromagnetic field in a wireless energy transfer system. Through this analysis it is expected to be possible to evaluate the influence of the strong electromagnetic field on the data transmission channel. The wireless power transfer aimed at electric vehicles battery charging receives a great deal of attention in the recent years. However, the performance of those systems depends on the exchange of information between the transmitter and the receiver, e.g. vehicle identification, frequency, required power, payment information. Thus, it is essential to ensure that the electromagnetic interference, generated by the wireless power transfer system will not influence or disrupt the communication between the transmitter and the receiver. Keywords-Wirelesspower and data transmission; electromagnetic field; electromagnetic interference; impact on data channel

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Section: Introductionmentioning

confidence: 99%

Wireless power transfer impact on data channel

Baikova

Valtchev

Melício

et al. 2016

2016 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)

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“…In general, the closed-loop power control monitors power-level variations in the receiver and transmits this data to the transmitter controller via a communication link. After receiving the power-level data, the controller can vary the supply voltage of the power amplifier [11,12] or change the resonant capacitor value to detune the transmitter coil [13]. The transmitter should change its transmitted power such that the received power remains slightly above the minimum level to maintain the receiver operation [14].…”

Section: Introductionmentioning

confidence: 99%

Software-Based Wireless Power Transfer Platform for Various Power Control Experiments

et al. 2015

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Abstract:In this paper, we present the design and evaluation of a software-based wireless power transfer platform that enables the development of a prototype involving various open-and closed-loop power control functions. Our platform is based on a loosely coupled planar wireless power transfer circuit that uses a class-E power amplifier. In conjunction with this circuit, we implement flexible control functions using a National Instruments Data Acquisition (NI DAQ) board and algorithms in the MATLAB/Simulink. To verify the effectiveness of our platform, we conduct two types of power-control experiments: a no-load or metal detection using open-loop power control, and an output voltage regulation for different receiver positions using closed-loop power control. The use of the MATLAB/Simulink software as a part of the planar wireless power transfer platform for power control experiments is shown to serve as a useful and inexpensive alternative to conventional hardware-based platforms.

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“…Kim J. [23] described the addition of loop switching techniques to multiple loop coils at the transmitter and load side to improve transmission efficiency. Each ring coil should be individually controlled, which increased design size and system complexity.…”

Section: State Of the Artmentioning

confidence: 99%

Detuning Mechanism and Frequency Tracking Algorithm for Wireless Power Transmission System

Li¹,

Xiang²,

Li³

et al. 2017

JESTR

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Wireless power transmission (WPT) uses a loosely coupled transformer to transmit electric energy. The resulting system's transmission efficiency and distance are affected by factors such as, inductance parameter and resonance frequency offset. To reduce the influence of detuning on transmission efficiency, a frequency tracking method based on the hill-climbing algorithm was proposed in this study. The WPT model was established to depict the detuning mechanism and the transmission efficiency affected by natural frequency changes in the primary and secondary coils. Experimental data were used to prove the correctness of the theoretical analysis. Results demonstrate that the coupling coefficient of the two coils is proportional to the increase of the distance between the transmitting and receiving coils. Hence, coupling coefficient influences transmission efficiency. Another important factor is distance S, as its increase leads to mutual loss, which breaks the previous state of the best resonance compensation, which in turn reduces the transmission efficiency of WPT. When distance S increases from 10 mm to 30 mm and the system has no frequency tracking, the transmission efficiency decreases from 45% to 7.5%. However, when distance S increases from 10 mm to 30 mm and the system has frequency tracking, the transmission efficiency decreases from 70% to 19.1%. When distance S is equidistant, the transmission efficiency is much higher with than without frequency tracking. The proposed method can effectively raise the transmission efficiency of the WPT system and control the cost of hardware, which optimizes practical engineering design.

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Loop Switching Technique for Wireless Power Transfer Using Magnetic Resonance Coupling

Cited by 40 publications

References 17 publications

Wireless power transfer impact on data channel

Wireless power transfer impact on data channel

Software-Based Wireless Power Transfer Platform for Various Power Control Experiments

Detuning Mechanism and Frequency Tracking Algorithm for Wireless Power Transmission System

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