研究目的
To apply frequency response analysis (FRA) for improving the design and maintenance of wireless power transfer (WPT) systems by analyzing input impedance, voltage transfer ratio, and detecting variations due to component changes or displacements.
研究成果
FRA is effective for assessing WPT systems, enabling precise tuning of resonance frequency and detection of component variations. Key findings include accurate measurements at small air-gaps, performance degradation at large distances, distinct VTR patterns for different topologies, and the ability to detect ferrite displacements. FRA facilitates cost-effective condition-based maintenance and system retuning for high operational performance.
研究不足
The study is limited to two-coil inductively coupled WPT systems and specific compensating topologies. Performance degrades significantly at large air-gap distances (e.g., 200 mm) due to weak coupling. The efficiency achieved (85.75%) is lower than some state-of-the-art systems, and switching losses in power electronics are not fully mitigated. The method may not directly apply to far-field WPT or systems with multiple repeaters without further adaptation.
1：Experimental Design and Method Selection:
The study involves circuit analysis of a two-coil inductively coupled WPT model with different compensating topologies (SS, SP, PS, PP) to achieve efficient energy transfer. FRA measurements are used to analyze input impedance amplitude and phase angle over a wide frequency range.
2：Sample Selection and Data Sources:
Planar spiral coils are designed and built using Litz wire to reduce skin effect. Parameters are calculated using finite-element modeling (FEM) based on physical dimensions.
3：List of Experimental Equipment and Materials:
Includes a commercial FRA device, planar spiral coils made of 1650 stranded Litz wire, ferrite bars, acrylic boards, load resistors, and compensating capacitors.
4：Experimental Procedures and Operational Workflow:
FRA measurements are conducted on the WPT system at various air-gap distances (10 mm, 55 mm, 200 mm) and with different placements of ferrite material. The FRA is connected to measure transfer function and input impedance.
5：Data Analysis Methods:
Data is analyzed using equations derived from two-port network theory to extract real and imaginary parts of input impedance, voltage transfer ratio, and phase angles. Results are compared with calculated values.
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