Maximum efficiency control scheme and design method for resonant circuit of Bi-directional inductive power transfer system

Ota, Ryosuke; Kakomura, Kengo; Hoshi, Nobukazu

doi:10.23919/epe17ecceeurope.2017.8099368

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…where r 1 and r 2 [Ω] are the ESR of primary-side coil L 1 and secondary-side coil L 2 , respectively. When it is assumed that the quality factors of coils Q are equal to each other, η rc can be expressed as the following equation [2]:…”

Section: Transmission Power and Efficiencymentioning

confidence: 99%

“…From the denominator of (10), the conditions for the maximum efficiency of the resonant circuit can be derived by using the relationship of arithmetic-geometric mean. These conditions are expressed as the following equation [2].…”

Section: Transmission Power and Efficiencymentioning

confidence: 99%

“…There is an adjustment method for supply and demand balance in a power system by utilizing the batteries on electric vehicles (EVs) as a part of energy storage systems [1][2][3][4][5]. In that case, these systems can be safe and maintainable by using bi-directional inductive power transfer (IPT) systems as battery chargers for EVs [1,2,[6][7][8][9][10][11]. However, IPT systems have a problem in that the power loss is larger than that of wired plug-in charging systems.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, the maximum-efficiency-tracking method for the resonant circuit [2,[7][8][9][12][13][14][15], the design method for the resonant circuit [2,11,16], the switching frequency control method for the secondary-side converter [14,17], and the soft-switching technique [9,15,[18][19][20] were proposed as the efficiency improvement method for IPT systems. In general IPT systems, much electromagnetic noise and power loss occur because the converters of IPT systems are driven in high switching frequency by tens of kHz.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Consideration on Maximum Efficiency of Resonant Circuit of Inductive Power Transfer System with Soft-Switching Operation

Ota

Nugroho

Hoshi

2019

WEVJ

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By using bi-directional inductive power transfer (IPT) systems as battery chargers for electric vehicles (EVs), battery charging operations become convenient and safe. However, IPT systems have problems such as occurrences of much electromagnetic noise and power loss because the converters of IPT systems are driven in high frequency by tens of kHz. To solve these problems, there is a case where the soft-switching technique needs to be applied to the converters of IPT systems. However, in soft-switching operation, the power factor of the resonant circuit becomes lower, resulting in a lower resonant circuit efficiency. In previous works, when the soft-switching technique was applied to the converters, the resonant circuit had not always been able to be operated with high efficiency because the influence caused by soft-switching operation had not been considered. For this reason, there was a case where the efficiency of the overall system with soft-switching operation became lower than the efficiency in hard-switching operation. Therefore, in this paper, the influence on the efficiency of the resonant circuit caused by the soft-switching operation is clarified by the theoretical analysis and experiments; then, the guideline for improving the efficiency of IPT systems is shown. As a result, in the experiments, it could be understood that the efficiency of the overall system with soft-switching operation becomes higher than the efficiency in hard-switching operation when the operating point of the resonant circuit was close to the requirement guideline, which is shown by using the primary-side voltage and the secondary-side voltage of the resonant circuit. Therefore, it is suggested that the efficiency of IPT systems could be improved by properly regulating the primary-side direct current (DC) voltage.

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Section: Transmission Power and Efficiencymentioning

confidence: 99%

Section: Transmission Power and Efficiencymentioning

confidence: 99%