Thin Magnetic Attractor for PMA Wireless Charging Voltage Detection
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Solution Overview
Problem
The challenge is to design a thin attractor for PMA wireless charging type wireless power reception modules with a thickness of 0.5 mm or less, which can stably detect the operating voltage required for PMA wireless charging, even when the modules are not aligned, and prevent particle separation and oxidation of the attractor's surface.
Innovation Solution
A thin magnetic piece with a saturation magnetic flux density of 0.5 tesla or more, made from materials like amorphous alloy or nanocrystalline alloy, is used to change the magnetic flux path, and a protective film or coating is applied to prevent particle separation and oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the attractor is increased to detect stable operating voltage in non-aligned states, then the detection reliability is improved, but the overall thickness of the wireless power reception module increases
Solution Approach 1:
The patent utilizes the high saturation magnetic flux density parameter of amorphous alloy or nanocrystalline alloy materials (0.5 T or more) to achieve stable voltage detection in non-aligned states with a thin attractor thickness of 150 μm or less. This material parameter change enables reliable magnetic flux path modification and voltage detection without increasing module thickness.
2Ease of manufacture
If the attractor is manufactured by punching process, then the manufacturing ease is improved, but particles separate from the punched surface and cause short circuits
Solution Approach 1:
The patent creates a composite structure by coating the punched attractor surface with a protective layer. This composite material approach combines the manufacturing simplicity of punched attractors with the reliability benefits of particle prevention, as the coating layer seals the punched surface to prevent metal particle separation that would cause short circuits.
3Ease of manufacture
If the punched surface of the attractor is exposed to the outside, then the manufacturing process is simplified, but the exposed surface oxidizes when contacted with moisture
Solution Approach 1:
The patent applies a protective coating layer to the punched attractor surface, creating a composite structure that maintains the simplicity of the punching manufacturing process while preventing oxidation. The coating layer acts as a barrier between the magnetic material and moisture, eliminating the harmful oxidation effect.
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 allows stable detection of the operating voltage in both aligned and non-aligned states, preventing short circuits and oxidation, thus enabling efficient wireless charging in thin wireless power reception modules.
Implementation Method 1
changes a path of magnetic flux by inducing a part of a magnetic force line generated in a permanent magnet of a wireless power transmission module
Implementation Method 2
induces a change in a voltage value in a hall sensor provided in the wireless power transmission module
Data Source
AI summary
Provided are an attractor for PMA wireless charging type wireless power reception module and a manufacturing method thereof, and a wireless power reception module having the same. The attractor for PMA wireless charging type wireless power reception module according to an embodiment of the present invention comprises: a wireless power reception module; and a thin magnetic piece formed of a magnetic material having a saturation magnetic flux density of 0.5 tesla or more such that a change in the voltage value of a hall sensor of a certain value or more can be detected in both an aligned state when a wireless power transmission module is aligned and a non-aligned state when the wireless power reception module is not in line with the wireless power transmission module within a non-alignment region having a certain area including the aligned state.