Inductor array for minimising transfer efficiency decrease of wireless power transmission components at misalignment

Abstract

A secondary coil design is reported for the stable transmission of wireless power in a misalignment situation. A coil array is applied to a secondary coil instead of typical single coil. When a misalignment occurs, the misalignment distance between an individual coil in the array and the primary coil is decreased relatively. Therefore, the sudden reduction in the inductive wireless power transmission (WPT) efficiency is mitigated. When the fabricated coil array transmits power, the maximum WPT efficiency improves by 56.45% compared with the typical single coil. The frequency band of the proposed array is wider, and this system can stably transmit power.

Design Considerations to Reduce Gap Variation and Misalignment Effects for the Inductive Power Transfer System

“…(r p + j ω L p + 1/j ω C p ) + ω 2 M 2 r s + R o a c + j ω L s certain range [21]- [25]. One disadvantage of this solution is the required large surface area, since the available room is always limited, especially for receiver side.…”

Pebbles Tracking Thanks to Rfid Lf Multi-Loops Inductively Coupled Reader

“…The loops can be associated in serial or parallel configuration in forward and reverse sense to modify the B-field distribution and assure better energy transfer efficiency between the loops. Multi-loops arrays, by splitting the loop in small loops, can improve the null-zone avoidance using the diversity combining of loop [3,4] or by including several forward and reverse loops can provide free TAG positioning [5,6] and orientation [7,8].…”