Self-Inductance-Based Metal Object Detection With Mistuned Resonant Circuits and Nullifying Induced Voltage for Wireless EV Chargers

Jeong, Seog Y.; Thai, Van X.; Park, Jun H.; Rim, Chun T.

doi:10.1109/tpel.2018.2813437

Cited by 93 publications

(42 citation statements)

References 39 publications

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“…When a metal object is present in the magnetic field generated by the additional detection circuit, a magnetic coupling effect occurs. The effect of the metal object can be seen as a variation in the equivalent internal resistance and self-inductance of the detection circuit [83,84]. The equivalent circuit is shown in Figure 9.…”

Section: (A) Detection Methods Based On An Active Impedance Deviationmentioning

confidence: 99%

“…The metal object can then be detected from the circuit impedance deviation. In [83] and [84], a detection method based on a coil impedance deviation was proposed, which utilized the variation in the self-inductance of a sensing circuit mounted on the Tx pad to realize the metal object detection. The sensing pattern consisted of multiple loop coil sets, with each loop coil set containing two coils connected in series with opposite polarities to cancel the induced voltage inside the coil set generated by the transmission coils.…”

Section: (A) Detection Methods Based On An Active Impedance Deviationmentioning

confidence: 99%

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Foreign Object Detection for Electric Vehicle Wireless Charging

Xia

Yuan

et al. 2020

Electronics

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Wireless power transfer technology is being widely used in electric vehicle wireless-charging applications, and foreign object detection (FOD) is an important module that is needed to satisfy the transmission and safety requirements. FOD mostly includes two key parts: metal object detection (MOD) and living object detection (LOD), which should be implemented during the charging process. In this paper, equivalent circuit models of a metal object and a living object are proposed, and the FOD methods are reviewed and analyzed within a unified framework based on the proposed FOD models. A comparison of these detection methods and future challenges is also discussed. Based on these analyses, detection methods that employ an additional circuit for detection are recommended for FOD in electric vehicle wireless-charging applications.

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Section: (A) Detection Methods Based On An Active Impedance Deviationmentioning

confidence: 99%

Section: (A) Detection Methods Based On An Active Impedance Deviationmentioning

confidence: 99%

Foreign Object Detection for Electric Vehicle Wireless Charging

Xia

Yuan

et al. 2020

Electronics

View full text Add to dashboard Cite

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“…Therefore, in order to cope with the problems caused by foreign metal objects, the method of using ferrite cores with proper distribution to eliminate the influence caused by the metal object is presented in Reference [12], and the method of enabling WPT through a metal encased device is also introduced in Reference [13]. Furthermore, some researchers propose the foreign object detection (FOD) method [1,14,15], which is an essential function to prevent the energy from being consumed in the form of heat. A method of load and metal object detection is presented in Reference [16].…”

Section: Idealized Operation Of the Class-e Inverter In Wpt Systemmentioning

confidence: 99%

“…Generally, when the metal object is far from the coils, ∆L and ∆R are relatively small, so K 1 in Equation (15) or K 2 in Equation (16) As a result, Im(∆Z 1 ) is positive, while Re(∆Z 1 ) is negative. According to Equation (17), the equivalent load impedance angle is larger than 49.052 • , so the ZVS soft-switching condition is maintained.…”

Section: A Foreign Metal Object Appears At the Outer Side Of Two Coilsmentioning

confidence: 99%

Effects of Foreign Metal Object on Soft-Switching Conditions of Class-E Inverter in WPT

et al. 2018

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A foreign metal object will deteriorate the performance of wireless power transfer (WPT) systems and cause insecurity issues. Therefore, the influence principles and rules of foreign metal objects on soft-switching conditions of Class-E inverters and the performance of WPT systems are developed in this paper. The effects of different metal materials on coil parameters at different frequencies and positions are analyzed first, then the effects of foreign metal objects on soft-switching conditions of Class-E inverters and the power transfer capability of WPT systems are investigated. Principle analyses and simulation results demonstrate that there are significantly different effects on the soft-switching conditions and power transfer when a foreign metal object is placed near the transmitter coil or the receiver coil. In addition, the monotonicity of the variation in power transfer also depends on the position of the foreign metal object. Finally, a WPT experimental prototype with a Class-E inverter is implemented to verify the influence principles and rules of foreign metal objects. The experimental results are highly consistent with the principle analyses and simulation results.

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“…In the field of static wireless charging technology, the research points mainly includes the design of the high-frequent inverter [3,4], the design of the wireless energy transceivers [5], the design of the compensation circuits [6,7], the optimization of the receiving power and efficiency [8,9], the foreign object detection [10,11] and the issue of the electromagnetic field [12]. The multi-phase resonant inverter is proposed to realize the high output power for wireless charging system of EVs in Reference [3] and [4].…”

Section: Introductionmentioning

confidence: 99%

Power Stabilization based on Switching Control of Segmented Transmitting Coils for Multi Loads in Static-Dynamic Hybrid Wireless Charging System at Traffic Lights

et al. 2019

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In order to promote the driving range of the electric vehicles (EVs), decrease the demand for large capacity battery and create more charging opportunities for the EVs, the static-dynamic hybrid wireless charging system is presented to utilize waiting time of traffic lights at intersections to replenish electricity in this paper. Firstly, the topology and principle of the proposed static-dynamic hybrid wireless charging system with short-segmented coils at traffic lights are introduced. Secondly, the general circuit model of the static-dynamic hybrid wireless charging system with multi-coupling between the primary and secondary sides is developed. The design method of the compensation circuit in primary side based on the number and the positions of the energized primary coils is investigated. After analyzing the characteristics of the system varying with the position of the single load, the control conceptions of the energizing mode alternating in primary side and the combination of the primary compensation capacitors are put forward. Then the power stabilization control strategy of the static-dynamic hybrid wireless charging system with multi short-segmented coils and multi loads is proposed. Finally, the theoretical analyses are verified with the experiments.

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Self-Inductance-Based Metal Object Detection With Mistuned Resonant Circuits and Nullifying Induced Voltage for Wireless EV Chargers

Cited by 93 publications

References 39 publications

Foreign Object Detection for Electric Vehicle Wireless Charging

Foreign Object Detection for Electric Vehicle Wireless Charging

Effects of Foreign Metal Object on Soft-Switching Conditions of Class-E Inverter in WPT

Power Stabilization based on Switching Control of Segmented Transmitting Coils for Multi Loads in Static-Dynamic Hybrid Wireless Charging System at Traffic Lights

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