Coils can be placed at a distance from 3 to 10mm. Ideally, for a
highly efficient solution, 4-6m distance is best. For example, we
have developed an 18W solution that is 87% efficient. There are
other solutions, such as magnetic resonance, that allow a greater
distance between the coils and for alignment. However, they will
also offer lower efficiency. It just depends on your design requirements, power and specific needs. Can a distance of 4-6mm work?
Do you need high efficiency? This will help guide your decisions.
MDT: Are there any other important design issues that our readers
should know about?
GG: Yes, another important factor is to ensure that the coil
docking and alignment can be controlled. We call this positioning,
where to ensure high efficiency, we recommend that a designer
continues to dock or “fix” a device into the charging station. Or
you can guide the position into the proper location by using a
mechanical method or even a magnet. (Fig. 2) Finally, you can
Fig. 2: From left to right: fixed positioning, guided positioning, and free positioning