Wireless Charging Coil Cross-Connection Layout for Lower Circulating Loss
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Solution Overview
Problem
Wireless charging coils experience significant eddy current losses and circulating current losses due to strong magnetic fields, which reduce charging efficiency, especially when coil windings are segmented to minimize eddy currents, leading to inefficiencies in energy transfer.
Innovation Solution
A coil module design featuring a projection cross structure with overlapping connection parts between coil windings, which cancels out induced currents and reduces circulating current losses by connecting outer and inner side parts in parallel, thereby optimizing magnetic field distribution and energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a cutting groove segments the coil winding into two small windings, then eddy current loss is reduced, but wireless charging efficiency is decreased due to circulating current loss
Solution Approach 1:
The cutting groove segments the coil winding into small windings to reduce eddy current loss, which is necessary for maintaining low energy loss in the charging system.
Solution Approach 2:
Connection parts are introduced to electrically connect the segmented small windings in parallel configuration. This merging of electrical paths ensures that induced currents flow in the same direction, canceling circulating current losses and thereby improving wireless charging efficiency while preserving the eddy current reduction benefits of segmentation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The coil module design significantly enhances wireless charging efficiency by minimizing circulating current losses and improving energy transfer between the transmitter and receiver coils, leading to more effective charging performance.
Implementation Method 1
alternating current carried by the transmitter coil in the wireless charger generates a magnetic field, and the receiver coil in the electronic device generates a voltage through magnetic coupling
Implementation Method 2
when a magnetic field passes through the cutting groove, induced currents IE that are in different directions are respectively generated in the two small windings on two sides of the cutting groove due to electromagnetic induction
Data Source
AI summary
This application discloses a coil module, which includes: an insulation layer, a first planar coil winding, and a second planar coil winding, one turn of coil of the first planar coil winding includes a first portion, a second portion, and a first connection part, and one turn of coil of the second planar coil winding includes a third portion, a fourth portion, and a second connection part. The first connection portion connects an outer side part of the first portion and an inner side part of the second portion, the second connection portion connects an inner side part of the third portion and an outer side part of the fourth portion, and there is an overlap between a projection of the first connection portion on a plane of the insulation layer and a projection of the second connection portion on the plane of the insulation layer.