Magnetic Resonant Coupling As a Potential Means for Wireless Power Transfer to Multiple Small Receivers

By B. L. Cannon, J. Hoburg, Daniel D. Stancil, S. Goldstein. IEEE transactions on power electronics, 2009

935 citations recorded by the source corpus.

Wireless power transfer via magnetic resonant coupling is experimentally demonstrated in a system with a large source coil and either one or two small receivers. Resonance between source and load coils is achieved with lumped capacitors terminating the coils. A circuit model is developed to describe the system with a single receiver, and extended to describe the system with two receivers. With parameter values chosen to obtain good fits, the circuit models yield transfer frequency responses that are in good agreement with experimental measurements over a range of frequencies that span the resonance. Resonant frequency splitting is observed experimentally and described theoretically for the multiple receiver system. In the single receiver system at resonance, more than 50% of the power that is supplied by the actual source is delivered to the load. In a multiple receiver system, a means for tracking frequency shifts and continuously retuning the lumped capacitances that terminate each receiver coil so as to maximize efficiency is a key issue for future work.

Subfields: Electrical and Electronic Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/506f744a38b823366bf75a624720590223715693

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Citations in the corpus

Experimental Results of High-Efficiency Resonant Coupling Wireless Power Transfer Using a Variable Coupling Method (2011, background): “Reference [7] shows a lumped circuit analysis for the wireless”
Opportunities and Challenges for Near-Field Wireless Power Transfer: A Review (2017, methodology): “[77] presented a lumped capacitor circuit for the WPT technique.”
Design and Optimization of Resonance-Based Efficient Wireless Power Delivery Systems for Biomedical Implants (2011, methodology): “Similar independent work was performed in [23] using very big external coils (radius of 150 mm) and small load coils (radius 6.”
High-Efficiency Wireless Power Transfer for Biomedical Implants by Optimal Resonant Load Transformation (2013, background): “In [17] and [19], this limited efficiency improvement was attributed to the drop of especially when a heavy load needs to be driven.”
A Critical Review of Wireless Power Transfer via Strongly Coupled Magnetic Resonances (2014, methodology): “Various hot research spots, including system architectures [14–17,19–47], frequency splitting [11,24,26,28,48,49],”
Flexible near field wireless optoelectronics as subdermal implants for broad applications in optogenetics (2017, positive): “These observations are consistent with those suggested by calculations, and they also illustrate the ability of this system to operate many devices at once, consistent with the expected relationship between the power transfer and the size of the loop antenna (Cannon et al., 2009).”
Design and Optimization of Circular Magnetic Structures for Lumped Inductive Power Transfer Systems (2011, background): “maintain good efficiency, coreless systems are typically operated at higher frequencies in the range of hundreds of kHz to MHz [25], [26].”
A Critical Review of Recent Progress in Mid-Range Wireless Power Transfer (2014, background): “Recent research has covered new areas such as multiple transmitters [44], [45] and multiple receivers [46]–[48].”
Wireless Charging Technologies: Fundamentals, Standards, and Network Applications (2015, background): “Previous demonstrations [39], [53]–[55] of magnetically coupled resonators have shown the capability to transfer power over longer distance than that of induc-”
Influence Factors Analysis and Improvement Method on Efficiency of Wireless Power Transfer Via Coupled Magnetic Resonance (2014, background): “This technology showed the potential to deliver power with higher efficiency than far-field approaches [5]–[10], and at longer ranges than traditional inductively coupled schemes [11].”