Magnetic-Field Communication Filtering in Multi-Device Wireless Charging
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Solution Overview
Problem
Current wireless power transfer systems face limitations in transferring power over longer distances due to decreased mutual inductance and increased electromagnetic interference (EMI) and heat generation, especially in multi-device charging scenarios, where alignment and heat dissipation become critical issues.
Innovation Solution
The system incorporates custom-shaped components with magnetic materials to concentrate magnetic fields, enhance coupling, and reduce EMI, along with advanced heat dissipation features and firmware settings to manage heat and optimize power transfer at extended distances and volumes, while also being ruggedized to withstand environmental stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If transmitter inductance and receiver inductance are increased to counteract coupling decrease at larger distances, then power transfer capability is improved, but equivalent series resistance increases causing more heat and greater energy losses
Solution Approach 1:
The patent changes the electrical parameters of the coils by introducing magnetic materials (ferrite or mu-metal) behind the coils to alter the magnetic field distribution and increase mutual inductance. This allows achieving higher power transfer at larger distances without proportionally increasing coil inductance and ESR, thus reducing energy losses compared to simply increasing inductance.
Solution Approach 2:
The patent introduces magnetic materials (ferrite or mu-metal) as intermediary elements positioned behind the transmitting and receiving coils. These materials act as mediators to concentrate and direct magnetic field lines, enhancing coupling between coils at larger distances without requiring excessive inductance increases that would lead to higher ESR and energy losses.
2Power
If transmitter inductance and receiver inductance are increased to counteract coupling decrease at larger distances, then power transfer capability is improved, but heat generation increases
Solution Approach 1:
The patent modifies the magnetic circuit parameters by adding magnetic materials behind the coils, which improves mutual inductance and power transfer efficiency at larger distances. This reduces the need for excessive current increases, thereby limiting heat generation compared to conventional approaches that would require higher inductance and current.
Solution Approach 2:
Magnetic materials (ferrite or mu-metal) are introduced as intermediary elements to concentrate and direct magnetic field lines, enhancing coupling efficiency. This improves power transfer without proportionally increasing current and heat generation, as the magnetic materials reduce flux leakage and improve field utilization.
3Length of stationary object
If designs transmit power effectively at larger distances, then charging distance is extended, but electromagnetic interference increases
Solution Approach 1:
The patent changes the magnetic field distribution parameters by introducing magnetic materials behind the coils. These materials concentrate and direct the magnetic field lines, improving coupling at larger distances while containing the electromagnetic field within a more defined spatial region, thereby reducing EMI spread to surrounding areas.
Solution Approach 2:
Magnetic materials (ferrite or mu-metal) serve as intermediary elements that concentrate and direct magnetic field lines between the transmitting and receiving coils. This improves power transfer at larger distances while containing the electromagnetic field, reducing flux leakage and EMI to surrounding areas compared to conventional coil designs.
4Adaptability or versatility
If multiple wireless power receiving and transmitting devices are present, then multi-device charging capability is improved, but alignment requirements and heat dissipation challenges increase
Solution Approach 1:
The patent modifies the magnetic field characteristics by introducing magnetic materials behind the coils, which concentrate and direct the magnetic flux. This creates a more focused and intense magnetic field region that improves coupling tolerance to misalignment, allowing multiple devices to be charged simultaneously with greater ease of alignment compared to conventional coil designs.
Solution Approach 2:
Magnetic materials (ferrite or mu-metal) are introduced as intermediary elements that concentrate and direct magnetic field lines, creating a more focused magnetic flux distribution. This enhances the magnetic field intensity in the charging region and improves tolerance to misalignment, facilitating easier multi-device charging without strict alignment requirements.
5Adaptability or versatility
If multiple wireless power receiving and transmitting devices are present, then multi-device charging capability is improved, but heat dissipation challenges increase
Solution Approach 1:
The patent changes the magnetic field distribution by introducing magnetic materials behind the coils, which improves coupling efficiency and power transfer effectiveness. This reduces the current required for effective power transfer, thereby reducing heat generation and making heat dissipation more manageable in multi-device charging scenarios compared to conventional designs.
Solution Approach 2:
Magnetic materials (ferrite or mu-metal) serve as intermediary elements that concentrate and direct magnetic field lines, improving coupling efficiency and power transfer effectiveness. This reduces the current required for effective charging, thereby reducing I²R losses and heat generation, making heat dissipation more manageable in multi-device charging scenarios.
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 approach enables efficient wireless power transfer over distances up to 5 mm to 25 mm with reduced EMI and heat buildup, supporting multiple device charging without the need for active cooling, thus improving reliability and cost-effectiveness.
Implementation Method 1
components with magnetic materials to concentrate magnetic fields, enhance coupling
Implementation Method 2
Inductive wireless power transfer occurs when magnetic fields created by a transmitting element induce an electric field, and hence electric current, in a receiving element
Implementation Method 3
passive heat dissipation features
Data Source
AI summary
A wireless power transmission system includes a wireless power transmitter, a wireless power transfer circuit electrically connectable to the at least one wireless power transmitter, and a transmitter controller. The transmitter controller is configured to determine presence of a wireless power receiver system, encode or decode a communications signal communicated over a magnetic field, the magnetic field produced by coupling of the wireless power transmitter and the one or more wireless power receiver systems. The transmitter controller is further configured to determine presence of one or more of unwanted noise, unwanted data, or combinations thereof, within a proximity communications frequency band, the proximity communications frequency band substantially similar to the communications frequency band. The transmitter controller is further configured to filter the one or more of unwanted noise, unwanted data, or combinations thereof to determine a filtered communications signal.