Sparse-Routed Magnetic Coils for Wireless Power Charging
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Solution Overview
Problem
Conventional wireless charging systems face inefficiencies in coil-to-coil efficiency due to parasitic resistance and self-capacitance losses, leading to energy waste, heat dissipation, and potential health risks from electromagnetic radiation.
Innovation Solution
A sparse routing coil structure with optimized turn spacing and width is designed, reducing parasitic resistance and self-capacitance by increasing turn spacing between wire turns, and a method to determine these parameters through simulation to maximize coil-to-coil efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional tight routing coil structure is used, then coil area is minimized, but parasitic resistance loss increases and charging efficiency decreases
Solution Approach 1:
The patent changes the geometric parameters of the coil structure by introducing turn spacing between adjacent wire turns. This parameter modification increases the turn-to-turn distance, which reduces parasitic capacitance and resistance losses while maintaining acceptable coil area through optimized spacing ratios (W/S ≤ 10).
Solution Approach 2:
The patent applies different spatial characteristics to different regions of the coil by introducing localized spacing between turns rather than uniform tight routing. This creates regions of reduced electromagnetic coupling between adjacent turns, lowering parasitic effects in critical areas while maintaining overall coil functionality.
2Loss of energy
If tight routing coil structure is used, then manufacturing is simplified, but self-capacitance loss increases and charging efficiency decreases
Solution Approach 1:
The patent modifies the geometric parameters by introducing controlled turn spacing S between adjacent wire turns. This parameter change reduces self-capacitance losses by increasing distance between conductive elements, while the spacing follows design rules (W/S ≤ 10) that maintain manufacturability through standardized fabrication processes.
3Object-affected harmful factors
If conventional coil structure is used, then power transfer is achieved, but electromagnetic radiation increases causing health concerns
Solution Approach 1:
The patent changes the spatial arrangement parameter by introducing turn spacing between wire turns, which reduces electromagnetic radiation by increasing distance between current-carrying conductors. This parameter modification lowers electromagnetic field intensity while maintaining power transfer efficiency through optimized spacing that balances radiation reduction with inductive coupling requirements.
Solution Approach 2:
The patent converts the potentially harmful effect of electromagnetic radiation by using turn spacing to reduce field intensity. The spacing that would seem to reduce coupling is actually optimized to minimize radiation exposure while maintaining sufficient power transfer, effectively transforming a harmful effect into a safety benefit.
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 sparse routing coil structure enhances coil-to-coil efficiency by reducing resistive losses and increasing self-resonant frequency, thereby minimizing energy waste and electromagnetic radiation, improving overall charging efficiency and safety.
Implementation Method 1
energy is transferred from one or more power transmitter (TX) coils to one or more power receiver (RX) coils through magnetic coupling
Implementation Method 2
The loss that affects the coil-to-coil efficiency includes the coil-to-coil loss, parasitic resistance loss of the TX and RX matching capacitors
Implementation Method 3
parasitic resistance and self-capacitance losses
Data Source
AI summary
A sparse routing coil structure for a magnetic coil in a wireless charging system is disclosed. The sparse routing coil structure may include a magnetic coil routed by turns of a wire and a turn spacing S between adjacent turns of the wire. The turn spacing S may be a space between adjacent turns of the wire, and a turn width is denoted as W. A ratio of W/S may be not larger than 10.