Wireless Power Transmitter Coil Selection by Position
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Solution Overview
Problem
Wireless charging efficiency is reduced when an electronic device is not positioned correctly on a wireless power transmission device, leading to unintended conductive patterns being activated, which decreases charging efficiency and delays the start of charging due to the need for sequential sensing operations to select a high-efficiency pattern.
Innovation Solution
A wireless power transmission device and method that determine the correct conductive pattern corresponding to the position of the electronic device among multiple patterns, allowing for immediate selection and activation of the optimal pattern for charging, thereby reducing unnecessary power usage and signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If sequential sensing operations are performed to select a high-efficiency conductive pattern, then charging efficiency is improved, but the start of charging is delayed
Solution Approach 1:
The patent applies preliminary action by pre-establishing correspondence relationships between position types and conductive patterns before charging begins. The controller pre-stores which conductive pattern corresponds to which position type, so when the electronic device is placed on the charging surface, the controller can immediately identify the position type and activate the corresponding conductive pattern without sequential sensing, thus eliminating start delay while maintaining charging efficiency
2Adaptability or versatility
If multiple conductive patterns are used to cover different positions, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the charging surface into multiple position types (first position type, second position type, etc.), each corresponding to a specific conductive pattern. This segmentation allows the system to use multiple conductive patterns for different positions, improving adaptability while keeping the control logic simple through direct correspondence between position types and patterns
Solution Approach 2:
The controller is designed with multi-functionality to handle different position types and select corresponding conductive patterns universally. The same controller architecture can manage any position type by referencing the pre-established correspondence relationship, avoiding the need for separate control mechanisms for each position and thus reducing overall device complexity
3Ease of operation
If the electronic device is not positioned at a predetermined location, then ease of operation is improved, but charging efficiency decreases
Solution Approach 1:
The patent applies local quality by creating different conductive patterns optimized for different local positions on the charging surface. Each position type has its own designated conductive pattern that is locally optimized for that area. The system identifies which local position the device occupies and activates the corresponding locally-optimized pattern, thus maintaining high charging efficiency regardless of where the user places the device
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 approach increases wireless charging efficiency by directly selecting the appropriate conductive pattern, reducing power wastage and signal interference, and allowing for rapid initiation of charging.
Implementation Method 1
Wireless charging can use an electromagnetic induction scheme or a resonant scheme with electronic devices such as smart phones
Implementation Method 2
a resonance scheme using resonance
Implementation Method 3
a conversion circuit that converts direct current power to alternating current power
Data Source
Figure 1~2a
Figure 2b~3c
Figure 4a~4c
AI summary
Disclosed is an apparatus for transmitting wireless power including: a plurality of coils; a position-sensing circuit that determines a position of an electronic device charged by the apparatus; and a control circuit determines at least one coil corresponding to the determined position of the electronic device from among the plurality of coils and transmit wireless charging power through one coil selected from the at least one determined coil. Other embodiments can be applied.