Wireless Charging Cover Resonator Structure for Higher Coupling
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Solution Overview
Problem
Current wireless charging technologies face inefficiencies in charging electronic devices without the need for a separate connector, particularly in resonance-based schemes, which affect the performance of resonators in power receiving units.
Innovation Solution
The implementation of a cover device with a first capacitor, a first coil, a ferrite sheet, and a metal sheet, where the first capacitor and coil form a closed loop, and the ferrite sheet and metal sheet are strategically positioned to enhance coupling and reduce inductance, resulting in a higher resonant frequency for the cover device compared to the power receiving unit, thereby improving wireless charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless charging technology uses resonance scheme with coils, then wireless power transmission can be achieved without connectors, but charging efficiency is insufficient
Solution Approach 1:
The patent applies composite materials by combining ferrite sheets with metal sheets (aluminum or copper) to form a hybrid resonator structure. The ferrite provides magnetic properties for resonance while the metal sheet reduces inductance and improves coupling, creating a composite structure that overcomes the limitations of conventional single-material coil designs and enhances charging efficiency
Solution Approach 2:
The patent changes the resonant frequency parameter by adjusting the inductance through metal sheet integration and optimizing the ferrite sheet properties. By tuning the resonant frequency of the cover device resonator to be higher than that of the power receiving unit, the system achieves better coupling and improved power transfer efficiency
2Reliability
If ferrite sheet is disposed on the coil to enhance coupling, then magnetic coupling improves, but inductance increases which may lower resonant frequency
Solution Approach 1:
The patent uses a composite structure where a metal sheet is placed on top of the ferrite sheet. The metal sheet compensates for the inductance increase caused by the ferrite by providing a path that reduces overall inductance, while the ferrite maintains the magnetic coupling enhancement. This composite approach allows simultaneous achievement of high coupling and high resonant frequency
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 efficiency of wireless power transmission to the power receiving unit by optimizing the resonant frequencies and coupling coefficients between the cover device and the power receiving unit, leading to improved charging performance.
Implementation Method 1
a ferrite sheet disposed on at least a portion of the first coil in a direction of coupling between the power receiving unit and the cover device
Implementation Method 2
a metal sheet disposed on a least a portion of the ferrite sheet in the direction of coupling between the power receiving unit and the cover device
Implementation Method 3
a first coil connected to the first capacitor... a first resonant frequency of the first coil may be higher than a second resonant frequency of a second coil of the power receiving unit
Implementation Method 4
a first capacitor, a first coil connected to the first capacitor... configured to form a closed loop. A first resonant frequency of the first coil may be higher than a second resonant frequency
Data Source
AI summary
According to various embodiments, a cover device capable of being coupled to a wireless power-receiving unit comprising circuitry configured to receive wireless power from a wireless power-transmitting unit comprising circuitry may comprise: a first capacitor; a first coil connected to the first capacitor; a ferrite sheet arranged, on at least a portion of the first coil, in the coupling direction between the wireless power-receiving unit and the cover device; and a metal sheet arranged, on at least a portion of the ferrite sheet, in the coupling direction between the wireless power-receiving unit and the cover device. The first capacitor and the first coil can form a closed loop. A first resonance frequency of the first coil can be higher than a second resonance frequency of a second coil of the wireless power-receiving unit.