A Critical Review of Recent Progress in Mid-Range Wireless Power Transfer

Hui, S. Y. Ron; Zhong, Wenxing; Lee, C. K.

doi:10.1109/tpel.2013.2249670

Cited by 1,241 publications

(517 citation statements)

References 52 publications

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“…According to (3), the reflected impedance of the transmitter Z 22 is given as (6), where R 22 is the reflected resistance of the transmitter, and X 22 is the reflecting reactance of the transmitter.…”

Section: -3mentioning

confidence: 99%

“…Inductive power transfer, 2-4 became a viable option for shorter distances, since it has high efficiency for power transfer. In 2006, an MIT research team found that efficient mid-range wireless power transfer 5,6 could be achieved by utilizing near field magnetic coupling between two identical resonators. 7 Only when the coils are tuned to a particular resonance frequency, can the coils transmit electricity through the air and around an obstacle with acceptable efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic impedance compensation for wireless power transfer using conjugate power

2018

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Wireless power transfer (WPT) via coupled magnetic resonances has been in development for over a decade. However, the frequency splitting phenomenon occurs in the over-coupled region. Thus, the output power of the two-coil system achieves the maximum output power at the two splitting angular frequencies, and not at the natural resonant angular frequency. According to the maximum power transfer theorem, the impedance compensation method was adopted in many WPT projects. However, it remains a challenge to achieve the maximum output power and transmission efficiency in a fixed-frequency mode. In this study, dynamic impedance compensation for WPT was presented by utilizing the compensator within a virtual three-coil WPT system. First, the circuit model was established and transfer characteristics of a system were studied by utilizing circuit theories. Second, the power superposition of the WPT system was carefully researched. When a pair of compensating coils was inserted into the transmitter loop, the conjugate power of the compensator loop was created via magnetic coupling of the two compensating coils that insert into the transmitter loop. The mechanism for dynamic impedance compensation for wireless power transfer was then provided by investigating a virtual three-coil WPT system. Finally, the experimental circuit of a virtual three-coil WPT system was designed, and experimental results are consistent with the theoretical analysis, which achieves the maximum output power and transmission efficiency.

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Section: -3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic impedance compensation for wireless power transfer using conjugate power

2018

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“…To address this problem, the system needs to be dynamically tuned in real time to improve transmission efficiency [34].…”

Section: Resonant Frequency Identification Based On Rms Current Of Inmentioning

confidence: 99%

Control Strategy for Vehicle Inductive Wireless Charging Based on Load Adaptive and Frequency Adjustment

Yang

Yan

et al. 2018

Energies

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Abstract:Wireless charging system for electric vehicles is a hot research issue in the world today. Since the existing research on wireless charging is mostly forward-looking aimed at low-power appliances like household appliances, while electric vehicles need a high-power, high-efficiency, and strong coupling wireless charging system. In this paper, we have specifically designed a 6.6 KW wireless charging system for electric vehicles and have proposed a control strategy suitable for electric vehicles according to its power charging characteristics and existing common wired charging protocol. Firstly, the influence of the equivalent load and frequency bifurcation on a wireless charging system is analyzed in this paper. Secondly, an adaptive load control strategy matching the characteristics of the battery, and the charging pile is put forward to meet the constant current and constant voltage charging requirements to improve the system efficiency. In addition, the frequency adjustment control strategy is designed to realize the real-time dynamic optimization of the entire system. It utilizes the improved methods of rapid judgment, variable step length matching and frequency splitting recognition, which are not adopted in early related researches. Finally, the results of 6.6 kW test show that the control strategy works perfectly since system response time can be reduced to less than 1 s, and the overall efficiency of the wireless charging system and the grid power supply module can reach up to 91%.

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“…The analysis of the mutual coupling between two resonant circuits has been discussed in [1]. Mutual inductance was described as:…”

Section: The Mutual Coupling Strengthmentioning

confidence: 99%

“…The concept of transmitting power wirelessly has been proposed by Nikola Tesla, a pioneer electrical engineer in WPT by introducing a large scale wireless power distribution [1].…”

Section: Introductionmentioning

confidence: 99%

A study on Relay Effect via Magnetic Resonant Coupling for Wireless Power Transfer

et al. 2016

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Abstract. Wireless power transfer (WPT) transmits electrical energy from a power source to an electrical load wirelessly or without any conductors. The capability of WPT to transmit the energy is limited. Therefore, a relay was introduced to increase the distance of the WPT capabilities. The effect of the relay has been investigated to extend the energy transfer distance. The effect of relay was demonstrated by placing a relay coil between transmitter and receiver, relay biased to transmitter and placing two relay coils in the designed system. Experimental results are provided to prove the concept of the relay effect. The power transmission efficiency can be achieved up to 75% at 1 meter distance.

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A Critical Review of Recent Progress in Mid-Range Wireless Power Transfer

Cited by 1,241 publications

References 52 publications

Dynamic impedance compensation for wireless power transfer using conjugate power

Dynamic impedance compensation for wireless power transfer using conjugate power

Control Strategy for Vehicle Inductive Wireless Charging Based on Load Adaptive and Frequency Adjustment

A study on Relay Effect via Magnetic Resonant Coupling for Wireless Power Transfer

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