Wireless Power Coil Selection for Under- and Over-Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless power transmission devices face challenges in reliably transmitting power to electronic apparatuses due to changes in position or situation, leading to fluctuations in coupling coefficient, transmission efficiency, and reception power, which can result in the electronic apparatuses shutting down if reception power falls below a critical threshold.
Innovation Solution
A wireless power transmission device and electronic apparatus system that uses multiple transmission and reception coils with varying inductances, along with a controller to adapt by switching between coils based on under-coupling or over-coupling modes, ensuring continuous operation by maintaining reception power above the critical level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single transmission coil is used, then the device complexity is low, but the reception power becomes unstable when coupling coefficient changes
Solution Approach 1:
The transmission coil is divided into multiple segments (first transmission coil and second transmission coil) with different inductances. Each segment can be independently selected based on the coupling condition, allowing the system to maintain stable reception power across varying positions and orientations without excessive complexity.
2Reliability
If multiple transmission coils with different inductances are used, then the reception power stability improves, but the device complexity increases
Solution Approach 1:
The system dynamically switches between different transmission coils based on real-time coupling conditions. The controller selects the appropriate coil (first or second) according to whether the system is in under-coupling or over-coupling mode, making the transmission system adaptable to changing positions and orientations while maintaining power stability.
Solution Approach 2:
The invention changes the inductance parameter of the transmission coil by selecting from multiple coils with different inductances. This parameter variation allows the system to optimize power transmission for different coupling conditions, resolving the contradiction between reliability and complexity.
3Loss of energy
If the coupling coefficient increases, then the transmission efficiency increases, but the reception power decreases when exceeding critical coupling coefficient
Solution Approach 1:
The system uses feedback from the electronic apparatus (power shortage information) and coupling mode detection to determine when to switch transmission coils. This feedback mechanism allows the system to respond to changing coupling conditions and maintain optimal reception power by selecting the appropriate coil configuration.
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 solution ensures stable and continuous operation of electronic apparatuses without the need for battery charging, improving user convenience by maintaining reception power above the critical threshold, even with changes in the position or situation of the power transmission device or apparatus.
Implementation Method 1
Wireless energy transfer technology is a technique for transmitting electrical energy from a transmitter to a receiver wirelessly using the principle of induction of a magnetic field.
Implementation Method 2
wireless power transmission technology that can transmit power wirelessly
Data Source
AI summary
A wireless power transmission device comprises a plurality of transmission coils having different inductances and a controller. The controller wirelessly transmits a first transmission power to the electronic apparatus through a first transmission coil among the plurality of transmission coils, obtains whether it is an under-coupling mode or an over-coupling mode, when receiving power shortage information from the electronic apparatus, changes from the first transmission coil to a second transmission coil according to the obtained mode, and wirelessly transmits a second transmission power to the electronic apparatus through the changed second transmission coil. The second transmission coil is one of the remaining transmission coils except for the first transmission coil among the plurality of transmission coils.