Abstract
This paper presents a systematic methodology for the optimal design of wireless power transfer (WPT) systems. To design a WPT for a specific application, the values of coil geometric parameters and the number of resonators should be chosen such that an objective function is maximized while satisfying all the design constraints. The conventional methodologies, which are based on cyclic coordinate optimization, are not comprehensive and efficient methods. This paper presents a design methodology based on the genetic algorithm (GA). The optimization method has been applied to designing different WPTs with series and parallel connections of load and different design constraints. Moreover, the number of resonators is considered as the design parameters. In addition, WPTs with parallel and series connections of load are compared from different aspects. The results of calculation, simulation and measurements demonstrate that the 2-coil WPT can be optimized to achieve maximum efficiency compared to the previously reported 2-coil and multi-coil WPTs. In a fabricated 2-coil configuration, a power transfer efficiency (PTE) of 82.7% and a power delivered to the load (PDL) of 173.89 mW are achieved.
Highlights
Wireless implantable microelectronic devices (IMDs) are being widely used today in diagnostic as well as therapeutic purposes [1,2]
A critical issue in designing an inductively coupled power transfer is the power transfer efficiency (PTE) which requires to be high while the size of coils need to be minimized, voltage transfer gain to be maximized, power delivered to the load (PDL) to be maximized and to obtain larger bandwidth of operation
The results show that compared with the traditional inductively coupled 2-coil systems or even 3- or 4-coil inductive links, the proposed approach significantly improves the power transfer efficiency
Summary
Wireless implantable microelectronic devices (IMDs) are being widely used today in diagnostic as well as therapeutic purposes [1,2]. A critical issue in the design of IMDs is the transferring of the required power to the implanted microelectronic device. To overcome the limitations of the current battery technologies and transcutaneous energy transfer for implanted devices, the wireless power transfer (WPT) system using inductively coupled coils has received considerable attention in recent years, in biomedical implants and in a variety of industrial applications [3,4,5,6,7,8]. A critical issue in designing an inductively coupled power transfer is the power transfer efficiency (PTE) which requires to be high while the size of coils need to be minimized, voltage transfer gain to be maximized, power delivered to the load (PDL) to be maximized and to obtain larger bandwidth of operation. High PTE is required to satisfy the tissue safety requirements and electromagnetic compatibility between the powering link and other nearby communication devices [9,10]
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