Position Detection Coil for Wireless Power Signal Reception
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in reliably receiving communication from power reception apparatuses due to signal intensity decreases caused by position detection coils increasing the distance between components and conductive materials attenuating signals, and the need for additional communication devices in existing solutions.
Innovation Solution
A power transmission apparatus that uses a position detection coil to detect the installation of a power reception apparatus on its surface, allowing the position detection coil to receive wireless signals instead of the power transmission coil, thereby reducing signal attenuation and eliminating the need for additional communication devices by utilizing existing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a position detection coil is added to detect power reception apparatus installation, then position detection capability is improved, but device complexity increases and signal attenuation occurs
Solution Approach 1:
The position detection coil is configured to serve dual purposes: detecting power reception apparatus installation positions and receiving wireless communication signals from the power reception apparatus. This multi-functionality eliminates the need for separate communication devices, reducing device complexity while maintaining improved position detection capability.
Solution Approach 2:
The patent merges the position detection function and communication reception function into a single coil system. The position detection coil is electrically connected to switch circuits that can connect it to either a position detection circuit or a communication reception circuit, combining what would traditionally be separate components into one integrated system.
2Reliability
If the position detection coil is used to receive wireless signals, then signal intensity is improved, but the distance between the power transmission coil and power reception coil increases
Solution Approach 1:
The position detection coil acts as an intermediary component between the power transmission coil and the power reception coil. It is positioned closer to the power reception coil than the power transmission coil, serving as a intermediate reception point that improves signal intensity while the switch circuit mediates its connection to different functional circuits based on operational needs.
3Reliability
If additional communication devices are added to receive signals from power reception apparatus, then communication reliability is improved, but device complexity and size increase
Solution Approach 1:
The position detection coil is designed to perform both position detection and communication reception functions. By making this single component multi-functional, the patent eliminates the need for additional dedicated communication devices, thereby maintaining communication reliability while reducing device complexity.
Solution Approach 2:
The position detection coil serves itself by performing multiple functions that would traditionally require separate dedicated components. The same coil structure and electromagnetic field interaction used for position detection is also utilized for receiving communication signals, allowing the system to use existing components for multiple purposes.
4Device complexity
If conventional power transmission coil is used for both power transmission and signal reception, then device complexity is reduced, but signal attenuation and noise interference increase
Solution Approach 1:
The patent segments the signal reception function from the power transmission function by introducing a separate position detection coil. This segmentation allows the power transmission coil to focus on power transmission while the position detection coil handles signal reception, reducing noise interference and signal attenuation. The switch circuit then segments the connection, routing the detection coil to appropriate receiving circuits as needed.
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 configuration enhances signal intensity and reliability of communication from the power reception apparatus, reduces the size and thickness of the power transmission apparatus, and prevents interference from noise sources, enabling efficient and precise power transmission.
Implementation Method 1
A wireless power transmission system sends AC power in a non-contact manner from a power transmission apparatus to a power reception apparatus by utilizing electromagnetic induction between a power transmission coil of the power transmission apparatus and a power reception coil of the power reception apparatus
Implementation Method 2
at least one position detection coil that is disposed between the installation surface and the power transmission coil and that detects a signal from the power reception coil of the power reception apparatus installed on the installation surface
Data Source
AI summary
A power transmission apparatus includes the following elements. A position detection coil detects a signal from a power reception coil of a power reception apparatus installed on an installation surface. A position detection circuit determines from the detected signal that the power reception apparatus is installed on the installation surface. A reception circuit receives a wireless signal transmitted from the power reception apparatus via the position detection coil. A switch circuit switches electrical connection of the position detection coil between the position detection circuit and the reception circuit. A power transmission control circuit switches electrical connection of the position detection coil from the position detection circuit to the reception circuit if it is determined that a voltage or a current of the detected signal has been smaller than a reference value for a predetermined period, and causes the reception circuit to receive the wireless signal via the position detection coil.