Wireless Power Transmission Coil Overlap and Shielding Design
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Solution Overview
Problem
Existing wireless power transmission technologies require dedicated chargers for each electronic device due to differences in antenna sizes, leading to inconvenience in use and certification issues for Qi standard coils.
Innovation Solution
A wireless power transmission apparatus with a first coil for smaller devices and a second coil of Qi standard A11 size, along with a shielding member and case design that accommodates both coils, allowing for efficient charging of different types of electronic devices without dedicated chargers, by overlapping and positioning the coils to maintain Qi standard compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single wireless power transmission apparatus is used to charge all types of electronic devices, then versatility and convenience are improved, but charging efficiency deteriorates due to size mismatches between coils and devices
Solution Approach 1:
The wireless power transmission apparatus is segmented into multiple coils with different sizes (first coil for small devices, second coil for large devices). Each coil is selectively activated based on the size of the electronic device being charged, allowing the system to maintain high charging efficiency while supporting multiple device types.
Solution Approach 2:
The system dynamically selects which coil to use based on the detected size of the electronic device. The controller activates either the first coil or the second coil according to the device size, enabling the apparatus to adapt its configuration in real-time to maintain optimal charging efficiency across different device types.
2Loss of energy
If dedicated chargers are provided for each electronic device type, then charging efficiency is maintained, but device complexity and user inconvenience increase
Solution Approach 1:
The wireless power transmission apparatus is designed with multi-functionality by incorporating multiple coils of different sizes within a single device. This universal design allows one charger to serve multiple device types (smartphones, tablets, laptops, etc.), eliminating the need for multiple dedicated chargers while maintaining high charging efficiency for each device type.
3Adaptability or versatility
If coils are positioned to accommodate different device sizes, then versatility is improved, but magnetic field interference increases
Solution Approach 1:
A shielding member is introduced to extract and contain the magnetic fields generated by each coil. The shielding member is positioned between the first and second coils to prevent magnetic field interference between them, allowing both coils to operate simultaneously or sequentially without mutual interference, thus enabling versatile device charging while maintaining electromagnetic compatibility.
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
Enables wireless charging of various electronic devices of different sizes using a single apparatus, improving convenience and resolving certification issues while maintaining high charging efficiency, even in misaligned states.
Implementation Method 1
Wireless power transmission technology which wirelessly transmits electrical energy to an electronic device has already been applied to electrical motors or transformers using the electromagnetic induction principle in the 1800s
Implementation Method 2
a shielding member configured to shield a magnetic field generated from the first coil and the second coil
Data Source
AI summary
A wireless power transmission apparatus having a first coil configured to wirelessly charge a battery of a first electronic device; a second coil formed to have a size relatively greater than that of the first coil and configured to wirelessly charge a battery of a second electronic device; a shielding member configured to shield a magnetic field generated from the first coil and the second coil; and a case configured to accommodate the first coil, the second coil, and the shielding member, wherein the first coil is disposed so that a portion corresponding to a first width of a coil body overlaps a coil body of the second coil, and a portion corresponding to a remaining second width excluding the portion corresponding to the first width is located in a hollow part formed in the coil body of the second coil.