A novel analysis of ZVS wireless power transfer system using coupled resonators

Hosotani, Tatsuya; Awai, Ikuo

doi:10.1109/imws.2012.6215801

Cited by 22 publications

(10 citation statements)

References 1 publication

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“…Furthermore, if power factor is set so that current changes its sign after the end of dead time, then devices are turned off with a minimum resonance current, and turn-off loss is reduced. [7][8][9][10] Therefore, power factor such that current changes its sign after the end of dead time is optimal from the viewpoint of inverter's switching loss.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Improvement of High Frequency Inverter for Wireless Power Transfer System Using Series Compensator

2018

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This paper proposes a wireless power transfer system using a series compensator GCSC (gate-controlled series capacitor) as a primary side capacitor. The GCSC is a circuit module that functions as a series variable capacitor by controlling semiconductor switches. The advantage of applying the GCSC to the primary side capacitor is that it provides controllability of the output power factor for a high-frequency inverter. Therefore, optimum operation of the high-frequency inverter can be achieved irrespective of the coil parameters by controlling the output power factor. Experimental results with a 1 kW laboratory prototype confirmed that the proposed system can achieve optimum operation and high efficiencies of the high-frequency inverter. K E Y W O R D Shigh-frequency inverter, series compensator, soft-switching, wireless power transfer Electr Eng Jpn. 2019;206:51-61.

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Section: Introductionmentioning

confidence: 99%

Efficiency Improvement of High Frequency Inverter for Wireless Power Transfer System Using Series Compensator

2018

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“…Some applications have been implemented, such as seafloor geodetic observing using robots [1], power feeding to electrical big-size car [2] and mobile phones. Since wireless power transfer is essential technology to reduce heavy batteries in modern portable devices, then, a lot of studies are progressed [1][2][3][4][5][6][7][8][9]. There are two kind of system which uses coupled resonance such as capacitive [3] and inductive.…”

Section: Introductionmentioning

confidence: 99%

“…Inductive coupling is well studied, their equivalent circuit [4], efficiency [5], and required conditions [6] are reported. Recently, power feeding to moving vehicles [7], high efficiency system [8], and design [9] were reported. Lots of key technologies and applications are expected to be developed and proposed.…”

Section: Introductionmentioning

confidence: 99%

A new configuration of magnetic coupled power transfer using parallel line feeder

Higashino

Okada

et al. 2013

2013 IEEE Wireless Power Transfer (WPT)

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This paper newly proposes a configuration of magnetic coupling in wireless power transform using parallel line power feeder. Previous researches mentioned that coil design and optimization of circuit parameters are necessary for strong magnetic coupled resonance. Then, these constraints prevent expansion of coverage area of wireless power transfer to electric portable devices, and electric vehicles. In order to make breakthrough against these limitations, this paper introduces parallel line as a feeder. The frequency of the electromagnetic wave is selected at 13.56 [MHz] in high frequency (HF) band, which is suitable for strong magnetic coupled resonance. Fundamental characteristics are evaluated by using equivalent circuits which are referred to the previous works. Theoretical analysis asserts that impedance transform is necessary in a power source and load circuits. Computer simulation evaluates a mutual inductance between primary and secondary coils, and optimum value of load resistance is clarified. Finally, input impedance and Sparameter are evaluated when power source circuit and feeder circuit are magnetic coupled resonance, these results imply that enhancement of power transfer efficiency is a further study.

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“…Though the power efficiency of such a system, on the other hand, is not high at all, they have tried to use the same signal source for the WPT systems [2,3,4,5]. Thus, we need to clarify the importance of high efficiency power source such as a class-D or class-E switching source [6,7,8,9], and discuss the property of its power transfer efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the transfer efficiency, the transferred power should also be discussed for the circuit above [9,10,11], considering that it has not attracted the interest of the communication engineers very much, in spite of the fact that the magnitude of transferred power is the objective itself for the WPT systems. The reason of their indifference may be the all-around use of S parameters, which are comparative quantities between the input and output.…”

Section: Introductionmentioning

confidence: 99%

Basic characteristics of “Magnetic resonance” wireless power transfer system excited by a 0 ohm power source

Awai¹

2013

IEICE Electron. Express

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Four most basic topics to understand the "Magnetic resonance" wireless power transfer system are discussed, the naming, power transfer efficiency, transferred power and how to connect resonator and external circuit. Emphasis is on the use of 0 ohm power source instead of 50 ohm signal source that is popular among the communication engineers. The misleading name "magnetic resonance" is criticized to give more correct picture of the resonance. Keywords: wireless power transfer system, magnetic resonance, transfer efficiency, transferred power, 50 ohm signal source, 0 ohm power source, indirect connection of resonator Classification: Electronic instrumentation and control References[1] A.

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A novel analysis of ZVS wireless power transfer system using coupled resonators

Cited by 22 publications

References 1 publication

Efficiency Improvement of High Frequency Inverter for Wireless Power Transfer System Using Series Compensator

Efficiency Improvement of High Frequency Inverter for Wireless Power Transfer System Using Series Compensator

A new configuration of magnetic coupled power transfer using parallel line feeder

Basic characteristics of “Magnetic resonance” wireless power transfer system excited by a 0 ohm power source

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