Nested Antenna Coil Layout for Compact Wireless Charging Heat Control
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Solution Overview
Problem
The challenge in designing compact electronic devices is the limited space for wireless charging structures and heat dissipation components, which interferes with other components and hinders efficient charging and heat management.
Innovation Solution
The electronic device incorporates an antenna structure with a base board, flexible printed circuit boards (FPCBs), and coils, where the conductive member is positioned to cross the second coil without overlapping with other components, and a heat dissipation sheet is placed between the battery and the base board to enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless charging structures and heat dissipation components are placed in compact electronic devices, then wireless charging function and heat management are improved, but space for other components is reduced and component interference increases
Solution Approach 1:
The patent implements nesting by placing the second coil inside the first coil, creating a nested configuration where the inner coil is positioned within the outer coil's spatial envelope. This nested arrangement allows both coils to occupy overlapping projected areas while maintaining functional independence, effectively maximizing space utilization for wireless charging components without encroaching on other device components.
Solution Approach 2:
The patent resolves spatial conflicts by transitioning from two-dimensional planar arrangement to three-dimensional layered configuration. The conductive member is positioned at a different height level (third dimension) relative to the coils, allowing it to cross the second coil without interfering with other components in the horizontal plane. This vertical stacking approach enables efficient heat dissipation and wireless charging functions while preserving space for other device components.
2Productivity
If coils are arranged to maximize wireless charging efficiency, then charging performance is improved, but interference with other components increases
Solution Approach 1:
The patent applies local quality by assigning different functional roles and spatial characteristics to different coil regions. The first coil and second coil are configured with different sizes, shapes, and positions, allowing each to optimize its local electromagnetic field distribution for wireless charging efficiency. The conductive member is strategically positioned to provide localized heat dissipation at specific hot spots without disrupting the overall charging efficiency.
Solution Approach 2:
The conductive member serves as an intermediary element that mediates between the coils and other device components. It provides a thermal conduction pathway that removes heat from the coil assembly while its specific positioning and configuration allow it to cross the second coil without causing electromagnetic interference or physical obstruction to other components.
3Temperature
If heat dissipation components are added to manage thermal energy, then heat management is improved, but device complexity increases
Solution Approach 1:
The conductive member is designed to serve multiple functions simultaneously: it acts as a heat dissipation component by providing thermal conduction pathways, serves as an electrical connection element by electrically connecting the first and second coils, and functions as a structural support element that helps position the coils correctly. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while still achieving effective heat management.
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 configuration allows for improved heat dissipation and efficient wireless charging performance without interfering with other components, enabling a thinner and more functional electronic device design.
Implementation Method 1
a heat dissipation sheet between the battery and the base board to enhance heat dissipation
Implementation Method 2
Wireless power transmission (or wireless energy transfer) technology refers to a technology of wirelessly transferring electrical energy from a transmitter to a receiver by using the principle of magnetic induction
Data Source
AI summary
An electronic device includes: a battery; a main circuit board operatively connected to the battery; and an antenna structure operatively connected to the main circuit board, the antenna structure including: a base board; a first flexible printed circuit board (FPCB) electrically connected to the main circuit board; a first coil including a first end portion and a second end portion, wherein the first end portion is electrically connected to the first FPCB; a second coil including a third end portion and a fourth end portion, wherein the third end portion is electrically connected to the first FPCB and at least a part of the second coil is disposed inside the first coil; and a conductive member electrically connected to the second end portion of the first coil and the fourth end portion of the second coil.