Rotating Magnetic Field Wireless Charging
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Solution Overview
Problem
Existing wireless charging systems face inefficiencies due to distance and orientation constraints between transmitting and receiving resonators, limiting high-efficiency wireless power transmission, especially when the resonators are not aligned.
Innovation Solution
A wireless charging apparatus that generates a rotating magnetic field in a 3D space using a controller and transmitter with a phase difference of 90 degrees between clock signals, allowing for efficient charging regardless of resonator orientation, and includes a buck converter to adjust input power and a supervisor to monitor quiescent current, ensuring optimal energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed transmitting resonator is used, then the system structure is simple, but the charging efficiency varies significantly when the receiving resonator orientation changes
Solution Approach 1:
The patent applies dynamics by making the magnetic field rotating instead of fixed. The transmitting resonator generates a rotating magnetic field that continuously changes orientation, allowing the receiving resonator to maintain efficient coupling regardless of its static orientation. This resolves the contradiction by making the field dynamic while keeping the physical structure relatively simple.
Solution Approach 2:
The patent transitions from a static 2D plane magnetic field to a 3D rotating magnetic field. By adding the time dimension through rotation and utilizing three-dimensional space for field distribution, the system achieves orientation-independent charging efficiency while maintaining structural simplicity.
2Reliability
If the transmitting resonator and receiving resonator must face each other, then the magnetic coupling is strong, but the system lacks adaptability to different orientations and positions
Solution Approach 1:
The rotating magnetic field continuously changes its orientation in 3D space, dynamically adapting to the position and orientation of the receiving resonator. This maintains strong magnetic coupling regardless of whether the resonators are facing each other, thereby achieving both reliable coupling and high adaptability.
Solution Approach 2:
The rotating magnetic field serves multiple orientations simultaneously, making the transmitting resonator universally compatible with receiving resonators in various positions and orientations. This multi-functional approach eliminates the need for precise face-to-face alignment while maintaining coupling efficiency.
3Reliability
If a rotating magnetic field is generated using multiple coils with phase differences, then the charging efficiency is equalized across 3D space, but the device complexity increases
Solution Approach 1:
The patent uses three coils arranged in three-dimensional space with 90-degree phase differences to create a rotating magnetic field. This 3D configuration equalizes charging efficiency throughout the space while managing the increased complexity through systematic spatial arrangement and phase control.
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 achieves equalized charging efficiency across a 3D space, eliminating null points and providing a 1.414 times gain in DC-to-DC efficiency, while reducing energy waste and ensuring safe operation by adjusting the intensity of the magnetic field based on the presence of foreign substances or devices.
Implementation Method 1
a transmitter configured to form a rotating magnetic field in a three-dimensional (3D) space in response to a first clock signal and a second clock signal
Data Source
AI summary
Disclosed is a wireless charging apparatus and method, the apparatus including a controller configured to control the wireless charging apparatus, and a transmitter configured to form a rotating magnetic field in a three-dimensional (3D) space in response to a first clock signal and a second clock signal generated under a control of the controller, wherein a phase difference between the first clock signal and the second clock signal is 90 degrees.