Wireless Power Receiver Inductance Stabilization Using Ferrite Shield and Compensator
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Solution Overview
Problem
Modern mobile communication devices face challenges in accommodating wireless power receivers and communications units due to the proximity of inductors, leading to inductance variations and operational impairments, especially when components from different manufacturers are integrated or operate at different frequencies.
Innovation Solution
A mobile communication device design featuring a wireless communications unit, a wireless power receiver, a ferrite shield, and a compensator to isolate the magnetic fields, allowing the inductors to operate at different frequencies without inductance variations, using a copper foil compensator to maintain constant inductance and prevent impedance mismatch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the wireless power receiver and wireless communications unit are placed in close proximity to save space, then the device compactness is improved, but the inductance of the communications unit inductor varies due to the ferrite shield, causing operational impairment
Solution Approach 1:
A compensator is introduced as an intermediary component between the first inductor and the ferrite shield. This compensator actively counteracts the inductance variations caused by the ferrite shield, allowing the inductors to operate in close proximity without compromising operational stability. The compensator mediates the harmful magnetic interaction while enabling the space-saving compact design.
2Adaptability or versatility
If components are designed simultaneously for integrated operation, then the system compatibility is improved, but the manufacturing complexity increases when components from different manufacturers must be coordinated
Solution Approach 1:
The wireless power receiver is segmented into a separate removable lid assembly that can be independently manufactured and then integrated with the main device. This segmentation allows different manufacturers to produce their components separately using standard interfaces, reducing manufacturing coordination complexity while maintaining system compatibility through the modular architecture.
3Ease of operation
If the wireless power receiver is mounted on a removable lid for flexibility, then the ease of operation is improved, but the inductance mismatch between the communications unit and transceiver worsens due to proximity effects
Solution Approach 1:
The compensator is pre-configured and positioned between the first inductor and the ferrite shield before the wireless power receiver is mounted on the removable lid. This preliminary arrangement ensures that the inductance compensation is already in place, preventing inductance mismatch issues from arising when the lid is attached, thus maintaining both operational flexibility and manufacturing precision.
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 ensures stable operation of both wireless power reception and communication systems, maintaining inductance constancy and preventing impedance mismatch, even when the wireless power receiver is mounted on a removable lid, allowing for effective coexistence and separate operation of NFC and WPT systems.
Implementation Method 1
a ferrite shield configured to be disposed between the first inductor and the second inductor
Implementation Method 2
a compensator configured to be disposed between the first inductor and the ferrite shield, and to compensate for inductance of the first inductor
Implementation Method 3
a wireless power receiver configured to receive power wirelessly using a second inductor
Implementation Method 4
a wireless communications unit configured to transmit and receive data using a first inductor
Data Source
AI summary
A mobile communication device having a wireless power receiver and wireless communications unit, in which inductors of the communications unit and the power receiver are in close proximity to each other, is provided. The mobile communication device includes a wireless communications unit including a first inductor configured to transmit and receive data via inductive coupling, and a wireless power receiver. The wireless power receiver includes a second inductor which is disposed above the first inductor and receives power via inductive coupling, a ferrite shield disposed between the first inductor and the second inductor, and a compensator disposed between the first inductor and the ferrite shield. Compensator is adapted to compensate for variations in the inductance of the first inductor caused by the ferrite shield.