Analytical Framework of S-parameter Based Efficiency for Secondary-Parallel Compensation WPT system to Authenticate Data Using VNA

Resonant Wireless Power Transfer (R-WPT) is the most efficient system in near-field applications. Predominantly, four distinct resonant topologies exist for R-WPT to enhance the power transfer efficiency (PTE) under different load conditions. Here, the PTE is considered crucial for gauging the R-WPT...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2023-01, Vol.72, p.1-1
Main Authors: Bharadwaj, Ananth, Sharma, Ashwani, Reddy, Chakradhar C.
Format: Article
Language:English
Subjects:
Capacitors
Compensation
Compensation topologies
Equivalent circuits
Error analysis
Inductance
mutual coupling
Network analysers
Network topology
Oscilloscopes
Parameters
Power measurement
Power Transfer Efficiency
S-parameters
Scattering parameters
Signal to noise ratio
Topology
Vector Network Analyzer
Very high frequencies
wireless power transfer
Wireless power transmission
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Summary:Resonant Wireless Power Transfer (R-WPT) is the most efficient system in near-field applications. Predominantly, four distinct resonant topologies exist for R-WPT to enhance the power transfer efficiency (PTE) under different load conditions. Here, the PTE is considered crucial for gauging the R-WPT system performance. In a typical experimental scenario, measurement of the PTE is performed by exciting the Tx coil with a sinusoidal signal using a high-frequency inverter source. Thereby, the input and output power measurements are conducted using an oscilloscope. Here, the measurement using an oscilloscope is highly susceptible to external noise. As an alternative, the vector network analyzer (VNA) is the most accurate instrument to measure S-parameters with high precision, even at very high frequencies. The S-parameter-based analytical expressions for evaluating PTE are available only for series-series compensation topology. Therefore, the VNA usage is severely limited for experimental validation of the other compensation topologies. This paper proposes an analytical evaluation of S-parameter-based PTE for secondary parallel compensation topology as a contribution. Moreover, the mathematical proof is deduced to determine the active operating load condition for the secondary parallel capacitor. Error analysis of experimental data is performed where the SNR of the measurement system is greater than 35 dB and the percentage error rate ϵ is less than 1.3%, which implies high precision and accuracy of the S-parameter-based VNA measurement system.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2023.3240224