Wireless Charging Pad Flat Capacitor Resonance Volume
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Solution Overview
Problem
Existing wireless charging systems face challenges in modifying resonance parameters without altering the housing and heat-dissipating structures, leading to increased volume and non-flat shapes, as well as issues with electromagnetic interference and component accommodation.
Innovation Solution
A wireless charging pad design incorporating a ferrite plate with a coil and a flat type capacitor, allowing for easy parameter modification, slim shape manufacturing, and reduced volume, while addressing heat emission and electromagnetic compatibility through a two-layer magnetic structure and component accommodation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a resonance tank is manufactured separately from a wireless charging pad, then the resonance parameter can be modified, but the device volume increases and the shape becomes non-flat
Solution Approach 1:
The patent integrates the resonance tank directly into the wireless charging pad structure, combining what were previously separate components. The resonance tank is formed within the housing of the charging pad, eliminating the need for external separate manufacturing and assembly, thus reducing overall device volume while maintaining resonance parameter adjustability through internal design modifications.
Solution Approach 2:
The patent employs a flat-type capacitor with extended electrodes that extend along the surface of the ferrite plate, utilizing the two-dimensional surface area rather than requiring three-dimensional volume. This dimensional transition allows the resonance tank to be integrated within the planar structure of the charging pad, maintaining a flat profile while achieving the necessary resonance functionality.
2Reliability
If a coil has one end coming out of the pad to secure insulation distance, then high induced voltage is managed, but the pad volume increases and shape becomes non-flat
Solution Approach 1:
The patent utilizes the vertical dimension (thickness direction) of the pad to accommodate the coil structure. The coil is wound around the ferrite plate with its ends extending in the thickness direction, allowing insulation distance to be achieved vertically rather than requiring horizontal extension. This maintains the flat top surface of the pad while securing proper insulation through vertical spacing and insulating structures within the housing.
3Object-affected harmful factors
If a magnetic body with PCB is placed at the bottom of the wireless charging pad to reduce electromagnetic interference, then EMC is improved, but the device volume increases
Solution Approach 1:
The patent integrates the magnetic body directly into the housing structure at the bottom of the wireless charging pad, combining the EMI shielding function with the structural housing. The magnetic body is positioned within the housing to shield the coil and electronic components, eliminating the need for separate EMI shielding components and reducing overall device volume while maintaining electromagnetic compatibility.
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
Enables flexible resonance parameter adjustment, minimizes volume, and improves electromagnetic compatibility, allowing for efficient and compact wireless charging with reduced induced voltage and electromagnetic interference.
Implementation Method 1
a resonance tank including a flat type capacitor. The flat type capacitor is configured to reduce an impedance of the coil
Implementation Method 2
a resonance tank including a flat type capacitor
Implementation Method 3
a ferrite plate, a coil disposed at the ferrite plate
Implementation Method 4
a magnetic body attached with a PCB is placed at the bottom of a wireless charging pad in order to reduce an electromagnetic interference
Implementation Method 5
a coil that has one end coming out of the pad to secure an insulation distance
Data Source
AI summary
A wireless charging pad includes a ferrite plate, a coil disposed at the ferrite plate, and a resonance tank that includes a flat type capacitor. The flat type capacitor is configured to reduce an impedance of the coil.