Autonomous System Concept of Multiple-Receiver Inductive Coupling Wireless Power Transfer for Output Power Stabilization Against Cross-Interference Among Receivers and Resonance Frequency Tolerance

Ishihara, Masataka; Fujiki, Keita; Umetani, Kazuhiro; Hiraki, Eiiji

doi:10.1109/tia.2021.3081071

Cited by 32 publications

(9 citation statements)

References 35 publications

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“…To dynamically compensate for the equivalent leakage inductances, the method of adjusting the system's operating frequency at the transmitter side is preferred over the method based on variable capacitors C s1 and C s2 [21,22] since no additional components are required.…”

Section: Power Distribution Methodsmentioning

confidence: 99%

“…Besides, although the cross coupling is eliminated from the load's perspective, it is still present in the system and affects the characteristic of the system input impedance, which leads to undesirable reactive power flow. Variable switched capacitor [21] and automatic tuning assist circuit (ATAC) [22] have been inserted into each receiver, but the inserted circuits inevitably increase the volume and size of receivers. In [23,24], DC-DC converters are cascaded to the receivers for regulating the equivalent load resistances, and thus the power can be accurately allocated to different loads.…”

Section: Introductionmentioning

confidence: 99%

“…FIGURE22 Comparison of the measured power distribution ratio characteristics with/without the proposed hybrid control.…”

mentioning

confidence: 99%

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A hybrid control strategy for dynamic compensation of cross‐coupling effect in two‐load IPT system

Cao

Bao²,

Loo

et al. 2023

IET Power Electronics

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The cross coupling between receiver coils complicates the control and optimization of “one‐to‐may” multi‐load IPT systems. In this paper, the cross‐coupling effect in a two‐load IPT system is thoroughly discussed. It is noted that the input impedance, the total output power and the power distribution ratio among receivers are all affected. After developing a new leakage‐inductance‐based model considering the cross‐coupling effect, it is suggested that the operating frequency is adjusted according to the cross‐coupling coefficient to ensure a constant power distribution ratio. The total output power and the input impedance are regulated by coordinated adjustment of the inverter's duty cycle and the transmitter‐side compensation capacitance with switched control capacitor (SCC) control. Based on the proposed hybrid control strategy (frequency, duty cycle, and SCC), the power distribution among loads and the total output power are kept constant under variable cross‐coupling coefficient, and the input impedance are shaped to be inductive to achieve zero voltage switching (ZVS) realization for all switches in the inverter. The theoretical analysis is finally verified by experimental results on a 35 W two‐load IPT prototype.

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Section: Power Distribution Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A hybrid control strategy for dynamic compensation of cross‐coupling effect in two‐load IPT system

Cao

Bao²,

Loo

et al. 2023

IET Power Electronics

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show abstract

“…In [21], [22], a FET bridge-based variable reactor was applied with a repeater resonator to retune the resonant frequency. In [23], a receiver-side FET bridge-based variable reactor was used to compensate for the detuning of the resonant frequency owing to natural tolerance and cross-coupling among multiple receivers. In [25], the 6.78-MHz operation of a FET bridge-based variable reactor in a receiver was demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Communication-Less Receiver-Side Resonant Frequency Tuning for Magnetically Coupled Wireless Power Transfer Systems

et al. 2023

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Compensating for deviations in the resonant frequency is crucial in magnetic resonance coupling wireless power transfer (WPT) systems. Thus, this study proposes a communication-less receiverside resonant frequency-tuning scheme that compensates for the reactance in the receiver without communicating with the transmitter. The proposed scheme comprises an inductor-capacitor-capacitor compensation topology at the transmitter and a half-bridge circuit at the receiver, whose operating phase is set to be orthogonal to the receiver current. Resonant frequency tuning can be achieved by adjusting the DC voltage applied to the half-bridge circuit to maximize the power received at the load. The reactance compensation ability of the proposed scheme is analyzed through experiments on a 200 kHz WPT system. When the secondary capacitance deviated from -20% to +20%, the efficiency degradation was maintained within 6.7% with the proposed scheme, whereas the efficiency degraded by up to 33.3% without compensation.

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“…Meanwhile, it also avoids redundant wires when consumers need to supply power to various electronic products. Currently, many applications have relied on the WPT technology, such as implanted medical devices (IMDs), portable devices, smart homes, autonomous underwater vehicles (AUVs), and wireless sensors [ 2 , 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Matrix Metamaterial Shielding Design for Wireless Power Transfer to Control the Magnetic Field

et al. 2022

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A wireless power transfer (WPT) system can bring convenience to human life, while a leakage magnetic field around the system can be harmful to humans or the environment. Due to application limitations of aluminum and ferrite materials, it is urgent to find a new type of shielding material. This paper first proposes a detailed model and analysis method of the matrix shielding metamaterial (MSM), which is applied to the low-frequency WPT system in an electric vehicle (EV). The MSM is placed on the top and side of the EV system to shield the magnetic field from all positions. To explore its function, a theoretical analysis of the MSM is proposed to prove the shielding performance. The simulation modeling and the design procedure of the MSM are introduced. Moreover, the prototype model of the WPT system with the MSM is established. The experimental results indicate that the magnetic field is controlled when the MSM is applied on the top or side of the EV-WPT system. The proposed MSM has been successfully proven to effectively shield the leakage magnetic field in the WPT system, which is suitable for the kHz range frequency.

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Autonomous System Concept of Multiple-Receiver Inductive Coupling Wireless Power Transfer for Output Power Stabilization Against Cross-Interference Among Receivers and Resonance Frequency Tolerance

Cited by 32 publications

References 35 publications

A hybrid control strategy for dynamic compensation of cross‐coupling effect in two‐load IPT system

A hybrid control strategy for dynamic compensation of cross‐coupling effect in two‐load IPT system

Communication-Less Receiver-Side Resonant Frequency Tuning for Magnetically Coupled Wireless Power Transfer Systems

Matrix Metamaterial Shielding Design for Wireless Power Transfer to Control the Magnetic Field

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