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Abstract
Wireless power transfer via inductive link is becoming a popular choice as an alternate powering scheme for biomedical sensor electronics. Spiral printed circuit board (PCB) inductors are gaining attractions for wireless power transfer applications due to their various advantages over conventional inductors such as low-cost, batch fabrication, durability, manufacturability on flexible substrates, etc. In this work, design of a multi-spiral stacked solenoidal inductor for biomedical application in 13.56 MHz band is presented. Proposed stacking method enhances the inductance density of the inductor for a given area. This paper reports an optimization technique for design and implementation of the PCB inductors. The proposed scheme shows higher inductance and better figure-of-merit values compared to PCB inductors reported in literature, which are desirable for wireless power transfer system.
Highlights
With the advancement of biomedical instrumentation technologies, sensor based remote healthcare monitoring system is gaining increasing attention in the recent years
This paper reports an optimization technique for design and implementation of the printed circuit board (PCB) inductors
The proposed scheme shows higher inductance and better figure-of-merit values compared to PCB inductors reported in literature, which are desirable for wireless power transfer system
Summary
With the advancement of biomedical instrumentation technologies, sensor based remote healthcare monitoring system is gaining increasing attention in the recent years. There is a need for small sized and high inductance, high quality factor inductors for implantable sensor applications. Where, Q1 and Q2 are the unloaded quality factors of the primary and secondary coils, respectively and “k” is the mutual coupling which has a value ranging from 0 to 1 This equation confirms that the efficiency increases as k2Q1Q2 increases, and the first and the foremost design consideration in an inductive link design is the attainment of the highest possible unloaded Q and k. Small sized high inductance coil has two distinctive advantages—high link efficiency and smaller size that increases the feasibility of placing WPT based implantable system in various biomedical applications.
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