Wireless Charging Coils Frequency Separation Crosstalk
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Solution Overview
Problem
Existing wireless charging systems face challenges in efficiently transferring power through removable accessories and maintaining alignment of coils for optimal charging, leading to potential interference and reduced efficiency.
Innovation Solution
The implementation of a wireless power system that includes a removable accessory with a dielectric layer and magnetic core for flux relay, along with magnetic alignment structures, allows for independent operation of coils at different frequencies to prevent crosstalk and ensure efficient power transfer between the accessory and the device, while maintaining alignment for optimal charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple coils operate at different frequencies for simultaneous power transfer, then power transfer efficiency is improved, but system complexity increases
Solution Approach 1:
The system divides the wireless power transfer function into separate coils operating at different frequencies. Each coil is dedicated to a specific frequency band, allowing simultaneous power transfer without interference. This segmentation enables multiple power transfer operations to occur independently and concurrently, improving overall system productivity while managing complexity through functional separation.
Solution Approach 2:
The system dynamically assigns different frequency ranges to different coils based on their operational requirements. The first coil operates in a first frequency range while the second coil operates in a second frequency range, allowing the system to adapt to different power transfer needs simultaneously. This dynamic frequency allocation enables efficient power management across multiple devices or functions.
2Ease of operation
If a removable accessory is placed between the charging mat and device, then charging accessibility is improved, but power transfer efficiency deteriorates due to interference
Solution Approach 1:
The removable accessory acts as an intermediary component between the charging mat and the electronic device. It includes its own wireless power receiving coil that interfaces with the charging mat's transmitting coil, and a wireless power transmitting coil that interfaces with the device's receiving coil. This intermediary structure allows the accessory to be placed between the charging mat and device while maintaining efficient power transfer through dedicated wireless power paths, preventing direct interference with the charging relationship.
Solution Approach 2:
The wireless power system implements a nested structure where the removable accessory contains both receiving and transmitting coils, creating a wireless power relay. The accessory's receiving coil is nested within the accessory housing, and its transmitting coil is also integrated within the same structure. This nested arrangement allows the accessory to function as a self-contained wireless power bridge, maintaining charging efficiency while improving accessibility and device protection.
3Productivity
If coils are aligned for optimal charging, then power transfer efficiency is improved, but alignment precision requirements increase
Solution Approach 1:
The system employs magnetic alignment structures with specific local magnetic properties positioned at predetermined locations within the wireless power system. These structures create localized magnetic fields that guide and attract the receiving device into proper alignment with the transmitting coil. By concentrating alignment functionality at specific locations rather than requiring uniform precision across the entire system, the patent achieves effective coil alignment while reducing overall manufacturing precision requirements.
Solution Approach 2:
The patent replaces mechanical alignment mechanisms with magnetic field-based alignment structures. Instead of relying on precise mechanical positioning or physical guides that would require high manufacturing tolerance, the system uses magnetic attraction forces generated by the alignment structures to automatically guide the receiving device into the correct position. This substitution of magnetic fields for mechanical systems significantly reduces alignment precision requirements while maintaining effective power transfer.
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 solution enables simultaneous wireless power transfer between multiple coils operating at different frequencies, reducing crosstalk and ensuring efficient charging, even when the accessory is interposed between the charging mat and the device, thereby enhancing the overall efficiency and reliability of the wireless charging process.
Implementation Method 1
The removable accessory may also include a magnetic core that relays flux from the wireless power transmitting device towards the first coil of the electronic device
Implementation Method 2
The removable accessory may include a dielectric layer that is interposed between the electronic device and a wireless power transmitting device during wireless power transfer operations
Implementation Method 3
the removable accessory may include a magnetic alignment structure that magnetically couples to additional magnetic alignment structures in the electronic device and/or the wireless power transmitting device to align coils within the charging system during operation
Implementation Method 4
The coil receives alternating-current wireless power signals from the wireless charging mat
Implementation Method 5
The rectifier circuitry converts the received signals into direct-current power
Data Source
AI summary
An electronic device in a wireless power system may be operable with a removable accessory such as a case. The device may have coplanar power transmitting and power receiving coils. The transmitting coil may be positioned within a central opening of the receiving coil. The removable accessory may have an embedded receiving coil configured to receive wireless power from the transmitting coil of the electronic device. The receiving coil of the electronic device may receive wireless power from a power transmitting device such as charging mat. The receiving coil of the electronic device may operate up to a higher maximum power than the transmitting coil of the electronic device. The power transmitting coil and power receiving coil in the electronic device may operate at different power transmission frequencies. To mitigate crosstalk, the power transmitting coil's operation frequency may be a non-integer multiple of the power receiving coil's operation frequency.