Double-D Communication Coil Layout for Isolated Wireless Power Links
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in achieving effective isolation between power transfer and communication paths, particularly when using magnetic induction, which can lead to interference and reduced communication bandwidth.
Innovation Solution
The use of Double-D coil configurations for wireless communications, where the respective halves of each coil are wound or driven in opposite directions to minimize cross-coupling, and in some cases, hybrid magnetic cores with different magnetic properties are employed to enhance isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If magnetic induction is used for wireless power transfer, then power transfer efficiency is improved, but communication bandwidth is reduced due to interference
Solution Approach 1:
The patent divides the magnetic coupling system into separate power transfer and communication paths. The power transfer uses a primary coil and secondary coil configuration, while the communication uses a separate communications coil that is magnetically coupled to the secondary coil. This segmentation allows independent optimization of power transfer efficiency and communication bandwidth without mutual interference.
Solution Approach 2:
The patent introduces a communications coil as an intermediary element between the power transfer system and the communication system. This communications coil is magnetically coupled to the secondary coil and provides a dedicated path for communication signals, acting as a mediator that enables communication without directly interfering with the power transfer magnetic field.
2Adaptability or versatility
If communication coil is added to the wireless power receiver, then communication capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the communications coil with the existing magnetic core structure of the power receiver. The communications coil is positioned to utilize the same magnetic flux path as the power transfer, merging the communication function with the existing power transfer infrastructure rather than adding completely separate components.
Solution Approach 2:
The magnetic core structure serves multiple functions: it provides magnetic flux path for power transfer, supports the communications coil for bidirectional communication, and maintains mechanical alignment. This multi-functionality reduces the need for separate dedicated components for each function.
3Reliability
If Double-D coil configuration is used for communication, then isolation from power path is improved, but manufacturing precision requirements increase
Solution Approach 1:
The Double-D coil configuration uses asymmetric winding patterns where the two D-shaped windings are oriented in opposite directions. This asymmetric design creates inherent magnetic field cancellation effects that improve isolation from the power transfer path, as the opposing windings generate counteracting magnetic fields that reduce cross-coupling.
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 achieves sufficient magnetic coupling for communication operations while maintaining isolation from the power transfer path, enabling higher communication bandwidth and efficient power transfer.
Implementation Method 1
a power receiving coil configured to be magnetically coupled to a power transmitting coil of a wireless power transmitter, wireless power receiving circuitry configured to receive energy from the power receiving coil
Implementation Method 2
a wireless communications coil coupled to the processing and communications system, the communications coil comprising a Double-D winding configured to be magnetically coupled to a parallel Double-D communications coil of the wireless power transmitter
Data Source
AI summary
A device can include a wireless power transfer coil configured to be magnetically coupled to a wireless power transfer coil of a complementary device, wireless power transfer circuitry, a processing and communications system, and a wireless communications coil coupled to the processing and communications system. The communications coil can include a Double-D winding configured to be magnetically coupled to a parallel Double-D communications coil of the complementary device to allow communications between the processing and communications system and the complementary device.