Wireless Power Receiving Coil with Segmented Copper and Spacer Wires
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Solution Overview
Problem
In wireless power transmission systems, densely wound receiving coils in small devices like smartphones lead to reduced power reception efficiency and increased heat generation, hindering fast charging.
Innovation Solution
A receiving coil structure is implemented with a first wire having a copper core and a second wire without a copper core, wound around the same center, where the second wire maintains the pitch of the first wire, thereby adjusting the internal resistance and reducing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the receiving coil is densely wound to reduce device size, then the inductance increases, but the power reception efficiency decreases and heat generation increases
Solution Approach 1:
The receiving coil is segmented into multiple independent wire units (first wires and second wires) instead of a single continuous wire. This segmentation allows each wire to be optimally spaced, reducing internal resistance and heat generation while maintaining the overall compact coil structure and inductance required for small device integration.
Solution Approach 2:
Different regions of the coil structure are assigned different functions: first wires with copper cores provide electrical conduction and inductance, while second wires without copper cores provide structural spacing to maintain optimal pitch. This local differentiation allows the coil to achieve both high inductance and low internal resistance in a compact form.
2Volume of moving object
If the receiving coil is densely wound to reduce device size, then the inductance increases, but the internal resistance increases causing heat generation
Solution Approach 1:
The coil is divided into multiple discrete wire segments with gaps between them, preventing the continuous dense winding that causes high internal resistance. The second wires act as spacers to maintain optimal pitch between first wires, reducing resistive heating while preserving the compact overall dimensions.
Solution Approach 2:
Second wires without copper cores serve as intermediary elements between the first wires. These intermediary wires maintain the necessary spacing (pitch) between conductive elements, reducing internal resistance and heat generation while allowing the coil to remain compact in size.
3Loss of energy
If the pitch of the first wire is increased to reduce internal resistance, then the power reception efficiency improves, but the device size increases
Solution Approach 1:
The first wires (conductive) and second wires (structural) are merged into a single integrated coil structure wound around the same center. This combination allows the conductive wires to be optimally spaced for low resistance while the entire assembly maintains a compact form factor suitable for small devices.
Solution Approach 2:
The coil structure utilizes three-dimensional spatial arrangement with wires wound around a common center axis. This dimensional approach allows optimal pitch between conductive elements while maintaining a compact overall volume, resolving the conflict between spacing requirements and device size constraints.
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 design improves power reception efficiency and reduces thermal energy generation, maintaining the compact size of the receiving coil while enhancing charging performance.
Implementation Method 1
a receiving coil in which a current based on a magnetic field formed by a transmitting coil of a wireless power transmitting apparatus flows
Data Source
AI summary
A wireless power receiving apparatus, according to an example embodiment, may include a receiving coil in which a first wire including a copper core and a second wire not including a copper core are wound around a same axis. The second wire may be located at a pitch of the first wire, and a diameter of the second wire may correspond to the pitch of the first wire.