Analysis of frequency splitting phenomena for magnetic resonance wireless power transfer systems

Xu, Dong; Yin, Shengqiang; Wang, Dongqing

doi:10.1109/cac.2017.8243217

Cited by 8 publications

(12 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There have been various basic studies of over-coupled WPT systems [14,[18][19][20]. In this paper, we first analyze an over-coupled WPT system based on the previous research.…”

Section: Analysis Of An Over-coupled Wpt Systemmentioning

confidence: 99%

“…Various studies have been conducted on these two types of WPT coil misalignments. In addition, problems that appear when the coils are over-coupled, where they become closer than the designed value of the coils, have also been studied [14,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…When over-coupling between coils occurs, the zero-phase angle (ZPA) of the equivalent input impedance of the WPT system is split into three points [18][19][20]. This is also called the frequency splitting phenomenon.…”

Section: Introductionmentioning

confidence: 99%

“…When the ZPA is split into three points, it becomes very difficult to select an operating frequency for zero voltage switching (ZVS) for stable operation of the inverter [21]. In addition, when the ZPA is split into three points, the minimum value of the input impedance is split from one point into two points, and it is possible for the frequency of maximum power transfer (MPT) to also split into two points [20]. However, even if the frequency of MPT and ZPA are split, the maximum power transfer efficiency (PTE) has at the resonant frequency of the Rx side [20].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, when the ZPA is split into three points, the minimum value of the input impedance is split from one point into two points, and it is possible for the frequency of maximum power transfer (MPT) to also split into two points [20]. However, even if the frequency of MPT and ZPA are split, the maximum power transfer efficiency (PTE) has at the resonant frequency of the Rx side [20]. Since the frequency of the MPT and the frequency of the maximum PTE are different, it becomes very difficult to select a resonant frequency.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Design Considerations for Adding Series Inductors to Reduce Electromagnetic Field Interference in an Over-Coupled WPT System

et al. 2021

View full text Add to dashboard Cite

This paper analyzes how over-coupled coils affect odd harmonic current and electromagnetic interference (EMI) in a wireless power transfer (WPT) system, and proposes design considerations for series inductors to solve the EMI problem. When the air gap of the coils of the WPT system decreases below a certain level and the coils are over-coupled, the odd harmonic component of the input impedance of the system decreases and odd harmonic currents increase. The increase in the odd harmonic components current quickly aggravates the EMI issues. To solve the EMI problem of the over-coupled WPT system, additional series inductors were applied to the system, and considerations for designing the series inductors were analyzed. When designing additional series inductors, power transfer efficiency, maximum power transfer, input impedance and odd harmonic components current must be considered. Using simulations and experiments, it was confirmed that the WPT system designed with analyzed considerations maintained relatively high efficiency and reduced EMI issues.

show abstract

“…There have been various basic studies of over-coupled WPT systems [14,[18][19][20]. In this paper, we first analyze an over-coupled WPT system based on the previous research.…”

Section: Analysis Of An Over-coupled Wpt Systemmentioning

confidence: 99%