Parallel Shielding Sheets for Thin Wireless Charging Modules
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Solution Overview
Problem
The challenge is to develop a shielding unit for wireless charging that reduces overall thickness while maintaining the required performance, particularly for portable terminals with multiple antennas operating at different frequency bands, where existing designs face difficulties in achieving the necessary characteristics due to the thinness of the wireless power receiving module.
Innovation Solution
The solution involves arranging two sheets with different characteristics in parallel on the same plane, with one sheet optimized for the wireless power transfer antenna operating in a low frequency band and another sheet optimized for NFC or MST antennas operating at a higher frequency band, allowing for efficient magnetic field shielding and reduced thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sheets with different characteristics are stacked to constitute a shielding unit for different antennas, then the shielding performance for each antenna is improved, but the overall thickness of the shielding unit increases
Solution Approach 1:
The patent transitions from a vertical stacking arrangement (multiple layers in the thickness direction) to a horizontal parallel arrangement (multiple sheets in the same plane). This dimensional change allows multiple shielding sheets with different characteristics to coexist without increasing overall thickness, as they are positioned side-by-side rather than one above the other.
Solution Approach 2:
The shielding unit is segmented into multiple discrete sheets, each optimized for specific frequency bands. These segmented sheets are arranged in parallel regions corresponding to different antennas, allowing each sheet to provide specialized shielding performance while maintaining a thin overall profile through the parallel configuration.
2Length of moving object
If the wireless power receiving module is made thinner to reduce terminal thickness, then the compact size requirement is met, but the characteristics required for wireless charging function become difficult to realize
Solution Approach 1:
Different regions of the shielding unit are assigned different sheet characteristics optimized for specific frequency bands. This local quality approach ensures that each antenna receives appropriate shielding tailored to its operating frequency, maintaining wireless charging performance even in the thinned module design.
Solution Approach 2:
The patent resolves the thickness-performance contradiction by reconfiguring the shielding structure from vertical stacking to horizontal parallel arrangement, enabling multiple functional sheets to coexist in the same plane without increasing overall thickness, thus preserving wireless charging characteristics in thin modules.
3Device complexity
If a single shielding sheet is used for all antennas, then the structure is simplified, but the shielding performance cannot be optimized for different frequency bands
Solution Approach 1:
The patent implements local quality by assigning different sheet characteristics to different regions corresponding to different antennas and frequency bands. This allows each antenna to receive optimized shielding for its specific operating frequency while maintaining a relatively simple parallel arrangement structure.
Solution Approach 2:
The shielding unit is divided into multiple discrete sheets, each optimized for specific frequency bands. These segmented sheets are arranged in parallel regions, providing specialized shielding performance for different antennas while maintaining structural simplicity through the parallel configuration.
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
This configuration enhances the performance of the antennas while minimizing the overall thickness of the shielding unit, enabling effective wireless charging even in extremely thin portable terminal designs, such as those with a total thickness of 0.6 mm or less.
Implementation Method 1
a first sheet for a wireless power transfer antenna and a second sheet for another antenna operating in a different frequency band from that of the wireless power transfer antenna
Data Source
AI summary
Provided are a shielding unit for wireless charging and a wireless power transfer module including the same. The shielding unit for wireless charging includes a first sheet for a wireless power transfer antenna, and a second sheet for another antenna operating in a different frequency band from that of the wireless power transfer antenna. The first sheet is provided in a first region which is disposed on a side of a virtual boundary line, and the second sheet is provided in a second region which is disposed on the opposite side of the first region.