Abstract
A system for the measurement of quality factors, self-inductances, and interturn capacitances of inductive power transfer coils, in the frequency range of 1–20 MHz, is demonstrated. Coil quality factor in excess of 1000 is measured at megahertz frequencies, beyond the capabilities of commercial impedance analyzers. The method used is to measure the transmission bandwidth of the coil under test while under weak magnetic coupling, incorporating measures to reduce common-mode coupling. The measurement system is verified by comparison with electromagnetic simulation and by modeling. The system model shows robustness to system configuration and the potential to measure coils with $Q$ in excess of 10 000.
Highlights
I NDUCTIVE power transfer (IPT) is a method of delivering power to a remote load using magnetic fields
In the frequency range focused on this paper (1–20 MHz), the coils are simple, air cored, loosely wound inductors of helical [2] or planar spiral form [3]
The EM simulations conducted in CST MWS are compared to the frequency-domain simulation of the measurement system and the measurements undertaken using the transmission method
Summary
I NDUCTIVE power transfer (IPT) is a method of delivering power to a remote load using magnetic fields. The space between the coils can be filled with dielectric (e.g., air) or partially conductive media (e.g., tissue). IPT can efficiently provide power to remote loads over distances comparable to the constituent coils’ diameters [1]. A complete IPT system (Fig. 1) is usually used to transfer power from a dc power source to a dc load and includes power electronic converters; this paper addresses only the inductive link between the coils. In the frequency range focused on this paper (1–20 MHz), the coils are simple, air cored, loosely wound inductors of helical [2] or planar spiral form [3]
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