Design and Optimization of a 3-Coil Inductive Link for Efficient Wireless Power Transmission
By Mehdi Kiani, Uei-Ming Jow, Maysam Ghovanloo. IEEE Transactions on Biomedical Circuits and Systems, 2011
552 citations recorded by the source corpus.
Inductive power transmission is widely used to energize implantable microelectronic devices (IMDs), recharge batteries, and energy harvesters. Power transfer efficiency (PTE) and power delivered to the load (PDL) are two key parameters in wireless links, which affect the energy source specifications, heat dissipation, power transmission range, and interference with other devices. To improve the PTE, a 4-coil inductive link has been recently proposed. Through a comprehensive circuit-based analysis that can guide a design and optimization scheme, we have shown that despite achieving high PTE at larger coil separations, the 4-coil inductive links fail to achieve a high PDL. Instead, we have proposed a 3-coil inductive power transfer link with comparable PTE over its 4-coil counterpart at large coupling distances, which can also achieve high PDL. We have also devised an iterative design methodology that provides the optimal coil geometries in a 3-coil inductive power transfer link. Design examples of 2-, 3-, and 4-coil inductive links have been presented, and optimized for a 13.56-MHz carrier frequency and 12-cm coupling distance, showing PTEs of 15%, 37%, and 35%, respectively. At this distance, the PDL of the proposed 3-coil inductive link is 1.5 and 59 times higher than its equivalent 2- and 4-coil links, respectively. For short coupling distances, however, 2-coil links remain the optimal choice when a high PDL is required, while 4-coil links are preferred when the driver has large output resistance or small power is needed. These results have been verified through simulations and measurements.
Subfields: Biomedical Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/da96e6523a33cc9408747013b873bb60668218d9
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In Biomedical Engineering
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Citations in the corpus
- Comparative Analysis of Two-Coil and Three-Coil Structures for Wireless Power Transfer (2017, unknown): “has been given in [28].”
- High-Efficiency Wireless Power Transfer for Biomedical Implants by Optimal Resonant Load Transformation (2013, methodology): “which denotes how efficiently the power amplifier drives the inductive coupling coils [3], [20], [22], [23], [26], and the efficiency from the inductive coupling coils to the load .”
- The Circuit Theory Behind Coupled-Mode Magnetic Resonance-Based Wireless Power Transmission (2012, methodology): “Calculated PTE values are from the RLT and CMT models described in previous sections, while the circuit parameters, such as and , are extracted from the models presented in [33] and [36] for PSCs and wire-wound coils, respectively.”
- A Critical Review of Wireless Power Transfer via Strongly Coupled Magnetic Resonances (2014, methodology): “[25] presented the equivalent circuit model of system architecture with three coils based on CT, and pointed out that the drawback of system architectures with four coils is the low transfer power despite the high transfer efficiency.”
- Wireless Charging Technologies: Fundamentals, Standards, and Network Applications (2015, background): “However, multiple devic charging can be implemented with multiple access for data transmission among charging devices and a charger has to be developed and implemented.”
- A Critical Review of Recent Progress in Mid-Range Wireless Power Transfer (2014, methodology): “The use of relay resonators between the Sending coil and Receiving coil has recently been tested [52-56] for improving system energy efficiency and extending the transmission distance.”
- A Methodology for Making a Three-Coil Wireless Power Transfer System More Energy Efficient Than a Two-Coil Counterpart for Extended Transfer Distance (2015, methodology): “The use of three-coil systems has been addressed in [19] and [24].”