Wireless Power Reception Module With Insulated Magnetic Shielding
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Solution Overview
Problem
The integration of heart rate sensor modules and wireless power reception modules in wearable devices poses challenges due to potential electrical short circuits from metallic components in magnetic shielding sheets and inefficient use of circuit board space, leading to increased thickness and manufacturing costs.
Innovation Solution
A wireless power reception module design featuring a circuit board with a wireless power reception antenna, a shielding unit with a magnetic sheet, and an empty space portion to accommodate the sensor module, where the magnetic sheet is covered by an insulating material and the terminal pattern is protected to prevent electrical shorts, allowing for integration of both modules without discarded circuit board areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a magnetic sheet including a metallic component is used for shielding, then magnetic field shielding performance is improved, but electrical short circuit risk increases due to contact with terminal patterns
Solution Approach 1:
An insulating coverlay is introduced as an intermediary layer between the magnetic sheet and the terminal pattern. This coverlay prevents direct contact between the metallic component of the magnetic sheet and the conductive terminal pattern, thereby eliminating the electrical short circuit risk while maintaining the magnetic field shielding performance of the magnetic sheet.
Solution Approach 2:
The shielding structure is segmented into distinct functional layers: the magnetic sheet for magnetic field shielding and the insulating coverlay for electrical isolation. This segmentation allows each component to perform its specific function without interfering with the other, resolving the contradiction between shielding effectiveness and electrical safety.
2Adaptability or versatility
If a through part is formed in the circuit board for sensor module arrangement, then sensor module integration is enabled, but circuit board area utilization decreases
Solution Approach 1:
The sensor module is nested within the hollow interior space of the magnetic sheet structure. This nesting arrangement allows the sensor module to be integrated into the device without requiring additional through parts in the circuit board, as the magnetic sheet's internal cavity provides the necessary accommodation space. Consequently, the circuit board area is fully utilized for other functional components.
3Length of stationary object
If the wireless power reception module and sensor module are integrated into one module, then device thickness is reduced, but manufacturing complexity increases
Solution Approach 1:
The wireless power reception module and sensor module are merged into a single integrated structure where the sensor module is positioned within the hollow space of the magnetic sheet. This merging reduces the overall device thickness by eliminating separate housing structures and inter-module connections, while the modular design with clear functional zones maintains manufacturing simplicity.
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 design enhances product reliability by preventing electrical shorts, reduces manufacturing costs by minimizing circuit board usage, and improves wireless power reception performance by minimizing magnetic field leakage.
Implementation Method 1
a shielding unit which includes a magnetic sheet formed of a magnetic material to shield a magnetic field
Data Source
AI summary
A wireless power reception module including an antenna unit which includes a circuit board including a first surface and a second surfaces which are opposite to each other, a wireless power reception antenna formed as an antenna pattern on the first surface of the circuit board, a terminal pattern extending to a predetermined length from the wireless power reception antenna on the first surface, and a first coverlay attached to the first surface and a shielding unit which includes a magnetic sheet formed of a magnetic material to shield a magnetic field and having a side surface exposed to the outside and disposed on one surface of the antenna unit to be positioned at a position corresponding to the wireless power reception antenna, the first coverlay attached to the first surface, covering both the wireless power reception antenna and part of the total length of the terminal pattern.