Integrated Wireless Charging Coil Structure for Induction and Resonance Modes
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Solution Overview
Problem
Current wireless charging technologies face inefficiencies in both magnetic inductive and resonant charging methods, particularly in supporting low-power devices like smartphones, where inductive charging is less efficient at longer distances and resonant charging has low transmission efficiency.
Innovation Solution
An integrated wireless charging transmitter with a first coil for magnetic induction and a second coil for magnetic resonance, controlled by a controller to operate in either mode, along with an EBG structure to enhance transmission efficiency, allowing both coils to function as resonance coils for improved charging efficiency and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If magnetic inductive charging is used, then charging efficiency is high at short distance, but charging distance is limited to at most few centimeters
Solution Approach 1:
The patent combines both magnetic induction coil and magnetic resonance coil into a single wireless charging transmitter device. The controller selectively activates either the induction coil or resonance coil based on the charging distance and device type, merging the advantages of both charging methods into one system.
Solution Approach 2:
The system dynamically switches between magnetic induction mode and magnetic resonance mode based on real-time detection of charging distance, device type, and environmental conditions. The controller adjusts the operating mode to optimize charging efficiency at different distances.
2Length of moving object
If magnetic resonant charging is used, then charging distance and alignment freedom are improved, but transmission efficiency decreases
Solution Approach 1:
The system dynamically switches between magnetic induction mode and magnetic resonance mode based on real-time detection of charging distance, device type, and environmental conditions. The controller activates resonance mode only when appropriate (for resonance-type terminals at longer distances), otherwise using induction mode for higher efficiency.
Solution Approach 2:
The controller detects the type of terminal (induction-type or resonance-type) and the charging environment, then selectively activates the appropriate coil and mode. This feedback mechanism ensures that resonance mode is used only when it provides actual benefits, avoiding unnecessary energy loss.
3Adaptability or versatility
If separate induction coil and resonance coil are used, then both charging types are supported, but device complexity increases
Solution Approach 1:
The patent combines both magnetic induction coil and magnetic resonance coil into a single wireless charging transmitter device with integrated control. The controller selectively activates either coil based on the charging requirements, merging the functionality of separate systems into one integrated device.
Solution Approach 2:
The wireless charging transmitter is designed as a universal device that can charge both induction-type terminals and resonance-type terminals. The single device performs multiple functions by selectively activating the appropriate coil and mode based on the terminal type detected.
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 supports high charging efficiency for both induction and resonant modes, enhancing user convenience in restricted spaces and moving environments like vehicles by increasing the charging range and efficiency while minimizing alignment constraints and frequency interference.
Implementation Method 1
The magnetic inductive charging is a contact-type wireless charging technology that transmits power of few watts (W) and few kilowatts (kW) at a close distance within at most few centimeters (cm) using electromagnetic induction between a primary coil and a secondary coil
Implementation Method 2
The magnetic resonant charging is a short-distance wireless charging technology that transmits power at a close distance of tens of cm using resonance between a primary coil and a secondary coil
Implementation Method 3
an EBG structure to enhance transmission efficiency
Data Source
AI summary
Provided is a wireless power transmitter including a first coil disposed to transmit wireless power, a second coil disposed outside of the first coil to transmit wireless power, and a controller configured to determine whether to operate the wireless power transmitter in a magnetic induction mode or a magnetic resonance mode, control the first coil to operate in the magnetic induction mode and prevent the second coil from operating in the magnetic induction mode in response to the determination to operate the wireless power transmitter in the magnetic induction mode, and control the first coil and the second coil to operate integrally in the magnetic resonance mode in response to the determination to operate the wireless power transmitter in the magnetic resonance mode.