Wireless Charging Transmitter Coil Angles for Efficient Power Transfer
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Solution Overview
Problem
Traditional wireless charging transmitters with a single transmit coil or multiple coils with parallel magnetic fields suffer from low charging efficiency due to weak coupling between coils, leading to reduced power transmission and interference issues.
Innovation Solution
A wireless charging transmitter with a transmit coil group comprising at least two coils, where the magnetic fields generated by these coils form a non-parallel angle and have a coupling coefficient less than a predetermined threshold, allowing for a superimposed magnetic field that enhances energy transmission efficiency while minimizing self-coupling interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transmit coils are employed to transmit electric energy, then the charging flexibility is improved, but the charging efficiency is reduced due to weak coupling between coils
Solution Approach 1:
The patent applies dimensionality change by arranging multiple transmit coils in different spatial orientations (e.g., horizontal, vertical, inclined angles) rather than parallel planes. This spatial reconfiguration transforms the magnetic field distribution from weak, dispersed fields to a superimposed magnetic field with enhanced coupling to the receive coil, thereby improving charging efficiency while maintaining multi-coil flexibility.
2Device complexity
If multiple transmit coils with parallel magnetic field orientations are used, then the device complexity increases, but the charging efficiency remains low due to self-coupling interference
Solution Approach 1:
The patent employs asymmetry by configuring transmit coils with non-parallel magnetic field orientations, specifically using different angles (e.g., 0°, 45°, 90°, or other asymmetric angles) relative to each other. This asymmetric arrangement breaks the parallel symmetry that causes self-coupling interference, allowing multiple coils to operate more independently and improving overall charging efficiency.
3Device complexity
If a single transmit coil is used, then the device complexity is reduced, but the charging efficiency is limited by weak coupling with the receive coil
Solution Approach 1:
The patent merges multiple transmit coils with different magnetic field orientations into a unified wireless charging transmitter system. The coils are electrically connected to a common power supply and control circuit, creating a combined system where the superimposed magnetic fields work together to enhance energy transmission to the receive coil, thereby improving productivity without excessive complexity.
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 improves wireless energy transmission efficiency by creating a superimposed magnetic field that enhances charging performance and reduces interference between coils, resulting in a better charging experience.
Implementation Method 1
at least two transmit coils configured to simultaneously transmit electric energy to an external receive coil
Implementation Method 2
orientations of magnetic fields generated by currents on the at least two transmit coils are not parallel and form a first angle
Data Source
AI summary
A wireless charging transmitter includes at least two transmit coils and at least two transmit circuit units; wherein the at least two transmit coils are configured to simultaneously transmit electric energy to an external receive coil, the at least two transmit coils are coupled such that orientations of magnetic fields generated by currents on the at least two transmit coils are not parallel and form a first angle, a coupling coefficient between the at least two transmit coils is less than a predetermined threshold and each of the transmit circuit units is electrically connected to each of the transmit coils and configured to supply a current to the transmit coil. Therefore, the current on each of the transmit coils in the wireless charging transmitter generates a corresponding magnetic field.