Magnetic Relay Case Structure for Wireless Charging Through Covers
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Solution Overview
Problem
Wireless charging systems face inefficiencies when a removable case is interposed between the wireless power transmitting and receiving devices, increasing the distance between coils and reducing charging efficiency.
Innovation Solution
Incorporating a ferrimagnetic core and copper shielding structures within the removable case to relay magnetic flux and maintain efficient power transfer by positioning the ferrimagnetic core in high magnetic flux density regions between the devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a removable case is interposed between the wireless power transmitting and receiving devices, then the device can be protected and covered, but the distance between coils increases and charging efficiency decreases
Solution Approach 1:
A ferrimagnetic core is introduced as an intermediary component within the removable case to relay magnetic flux between the transmitting and receiving coils. The core includes a first portion positioned near the transmitting coil and a second portion positioned near the receiving coil, creating a magnetic flux relay path that maintains efficient power transfer despite the physical separation introduced by the case structure.
2Device complexity
If the distance between coils is increased due to the case, then the device structure is more complete, but magnetic flux density between coils decreases
Solution Approach 1:
The ferrimagnetic core is strategically positioned in high magnetic flux density regions between the transmitting and receiving coils. The core's first portion is located adjacent to the transmitting coil where magnetic flux is generated, and the second portion is located adjacent to the receiving coil where magnetic flux is received, creating localized magnetic relay paths that concentrate and guide magnetic flux through the case structure.
3Loss of energy
If ferrimagnetic core is added to the case, then magnetic flux relay is improved, but device complexity increases
Solution Approach 1:
The removable case serves multiple functions: it provides physical protection for the electronic device, acts as a structural housing, and incorporates the ferrimagnetic core to enable efficient wireless power transfer. By integrating the magnetic relay function into the case itself, the design eliminates the need for separate magnetic relay components while maintaining protective and structural functions.
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 enhances wireless power transfer efficiency by concentrating magnetic field lines through the ferrimagnetic cores, ensuring effective alignment and alignment structures ensure proper alignment of coils, thereby maintaining charging efficiency even with the case interposed between devices.
Implementation Method 1
The ferrimagnetic core relays the magnetic flux between a transmitting coil in the power transmitting device and a receiving coil in the power receiving device
Implementation Method 2
The removable accessory may have an embedded ferrimagnetic core that relays magnetic flux during wireless power transfer operations
Implementation Method 3
The case may include copper shielding structures around the ferrimagnetic core
Implementation Method 4
The coil of the portable electronic device receives alternating-current wireless power signals from the wireless power transmitting device
Implementation Method 5
The rectifier circuitry converts the received signals into direct current power
Data Source
AI summary
A device in a wireless power system may be operable with a removable accessory such as a case. The device may transmit or receive wireless power through the case while the electronic device is coupled to the case. The case may have a folio shape with a front cover portion that covers the display of the electronic device. The case may have an embedded ferrimagnetic core that relays magnetic flux during wireless power transfer operations. Magnetic alignment structures in the case may position the ferrimagnetic core in the case in a high magnetic flux density region between the power transmitting device and the power receiving device. The ferrimagnetic core relays the magnetic flux between a transmitting coil in the power transmitting device and a receiving coil in the power receiving device. The ferrimagnetic core may be formed in a front portion, a sidewall, or a rear wall of a case.