Scheme for providing parity-time symmetry for low-frequency wireless power transfer below 20 kHz

Ishida, Hideaki; Furukawa, Hideyuki; Kyoden, Tomoaki

doi:10.1007/s00202-020-01041-3

Cited by 8 publications

(9 citation statements)

References 14 publications

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“…Figure 4(a) shows the frequency responses of the Rx coils obtained from experiments and calculations. In a previous study, we described the numerical calculation method for the Q value under consideration of the skin effect and core loss [23]. The calculation results are in good agreement with the experimental results.…”

Section: Coilssupporting

confidence: 59%

“…There are two resonant loops, namely (I) and (II), because the resonator can be regarded as a double resonator coupled with a mutual inductance. The resonance frequency in loop (I) corresponds to ωl and that in loop (II) corresponds to ωh [23]. Loop (I) or (II) is selected based on the resistance components in each loop.…”

Section: Zero Crossing Comparatormentioning

confidence: 99%

“…For a coil with a magnetic core, a designer can adjust the rn′ and rc values. In a previous paper [23], we showed a coil with a magnetic core that could operate in primary resonance mode (ωl). In this paper, we made a coil that operates in secondary resonance mode (ωh) due to the combination of a small cross-sectional area and a low winding resistance (see Table 2).…”

Section: Zero Crossing Comparatormentioning

confidence: 99%

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Application of Parity-Time Symmetry to Low-Frequency Wireless Power Transfer System

2022

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In this study, parity-time symmetry (PTS) was applied to a wireless power transfer (WPT) system in the low-frequency range of 30-40 kHz. A series-parallel topology was analyzed using the coupled mode theory. It was demonstrated that PTS can be preserved over a long transmission distance even at low frequencies by reducing the self-inductance of the receiver coil. The receiver solenoid coil (dimensions: 71 × 30 × 7.4 mm, mass: 45.6 g, self-inductance: 119 μH) was able to maintain a transmission power of 23±1 W and an efficiency of 83±1% within a distance of 12-40 mm. In addition, the suitable coil orientation range was significantly increased from ±5° to ±65°. The power conversion efficiency of a switching-mode amplifier based on a class-D inverter reached 97% at low frequency. These results are expected to contribute to the expansion of PTS-WPT applications.

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Section: Coilssupporting

confidence: 59%

Section: Zero Crossing Comparatormentioning

confidence: 99%

Section: Zero Crossing Comparatormentioning

confidence: 99%

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Application of Parity-Time Symmetry to Low-Frequency Wireless Power Transfer System

2022

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“…To improve the efficiency of the wireless charging system, we need to increase the frequency in the transmitter part, but there is a maximum limit for this phase. For this reason and based on [25,26], these simulation results show us the maximum allowable limit of the frequency. These were used to begin the simulation stage.…”

Section: Resultsmentioning

confidence: 71%

Inductive Power Transmission System for Electric Car Charging Phase: Modeling plus Frequency Analysis

Mohamed

Aymen

Alqarni

2021

WEVJ

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The effectiveness of inductive power transfer (IPT) presents a serious challenge for improving the global recharge system performance. An electric vehicle (EVs) needs to be charged rapidly and have maximum power when it is charged with wireless technology. Based on various research, the performance of this recharge system is attached to several points and the frequency resonance is one of those parameters that can influence. In this paper, we try to explore the relationship between the obtained power and the signal input frequency for charging a lithium battery, solve the class imbalance problem and understand the maximum allowed frequency. To obtain the results, a mathematical model was first created to demonstrate the relationship, then the dynamic model was validated and tested using the Matlab Simulink platform. The performance of the worldwide wireless recharging system in terms of frequency variation is depicted in a summary graph.

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“…PTS-WPT can be represented as the simplified coupled mode theory (CMT) model shown in Fig. 7 [15,16]. The gain rate g10 and loss rate ΓL are obtained from the power source and load resistance, respectively.…”

Section: Resonant Circuit Topologiesmentioning

confidence: 99%

System for wireless power transfer to rotating objects with stable power transmission based on parity- time symmetry

Ishida,

Akatsu,

Kyoden

et al. 2024

Preprint

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We propose a system for wireless power transfer to a rotating object using solenoid coils based on parity-time symmetry (PTS). Solenoid coils are ideal for wireless power transfer in confined spaces (e.g., they can be attached to the mechanical joints of robotic arms). Under PTS, the theorical transmission power and efficiency remain constant even when the magnetic coupling coefficient (km) changes. However, to preserve PTS, km values must be above the critical magnetic coupling coefficient (kmc) value. We conducted simulations and experiments to analyze the relationship between the rotation angle and km. Based on the results, we identified a coil arrangement for which km does not fall below kmc at any rotation angle. We maintained a transmission power of 20 W and a transmission efficiency of 80% during fast rotation with an angular velocity of 2.6 rad/s using a pair of small solenoid coils arranged with a gap of 33 mm between them.

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Scheme for providing parity-time symmetry for low-frequency wireless power transfer below 20 kHz

Cited by 8 publications

References 14 publications

Application of Parity-Time Symmetry to Low-Frequency Wireless Power Transfer System

Application of Parity-Time Symmetry to Low-Frequency Wireless Power Transfer System

Inductive Power Transmission System for Electric Car Charging Phase: Modeling plus Frequency Analysis

System for wireless power transfer to rotating objects with stable power transmission based on parity- time symmetry

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