Laminated Coil Unit for Wireless Charging and NFC
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Solution Overview
Problem
In portable wireless terminals, integrating a charging coil with a battery pack reduces battery capacity, and coexisting non-contact wireless communication and power transmission coils face challenges due to electromagnetic coupling, leading to performance deterioration and increased size.
Innovation Solution
A coil unit is designed with a first magnetic body and power transmission coil, and a second magnetic body and wireless communication coil, arranged in a laminated structure to minimize overlap and electromagnetic coupling, using different resonance frequencies and permeabilities to reduce performance deterioration while maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the charging coil is integrated with the battery pack, then the terminal thickness is reduced, but the battery capacity is reduced
Solution Approach 1:
The patent transitions from planar coil arrangement to a three-dimensional laminated structure where the communication coil and power transmission coil are stacked in different layers separated by a magnetic body. This vertical dimensionality change allows both coils to coexist without occupying the same space, resolving the conflict between terminal thickness and battery capacity.
2Quantity of substance
If the charging coil is provided separately from the battery pack, then the battery capacity is maintained, but the terminal size increases and electromagnetic coupling problems occur
Solution Approach 1:
The patent embeds the power transmission coil and communication coil within the battery pack structure, with the communication coil nested around the power transmission coil and separated by a magnetic body. This nesting approach maintains compact terminal size while preserving battery capacity by utilizing the vertical space within the battery pack.
3Reliability
If two coils are arranged to form a double ring, then the reception conditions are improved, but the arrangement area increases
Solution Approach 1:
Instead of arranging two coils side-by-side in a double ring configuration that increases arrangement area, the patent stacks the communication coil and power transmission coil in different layers separated by a magnetic body. This vertical arrangement maintains good reception conditions while minimizing the planar arrangement area.
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 solution effectively reduces electromagnetic coupling between coils, maintaining performance in both power transmission and wireless communication while minimizing the terminal's size and arrangement area.
Implementation Method 1
a magnetic body... arranged in a laminated structure to minimize overlap and electromagnetic coupling
Implementation Method 2
a power supplier and a power receiver... a coil in a power supplier is opposite to a coil in a power receiver to transmit power
Implementation Method 3
a wireless communication coil... arranged adjacent to and outside of the wireless power charging coil... different resonance frequencies
Data Source
AI summary
An electronic device having a communication capability is provided. The electronic device includes a housing having a generally rectangular shape in a plan view of the housing, and a non-contact charging module included in the housing. The non-contact charging module includes (i) a wireless charging coil having a substantially planar shape and formed of a wound electrical wire, and (ii) a magnetic sheet that overlaps with the wireless charging coil in the plan view of the housing. The electronic device further includes a Near Field Communication (NFC) antenna included in the housing and including an NFC coil formed of a wound electrical wire, and a guide having a generally rectangular outer shape in the plan view of the housing. The guide has a hole and the wireless charging coil is arranged in the hole of the guide.