Power Transmission Coil Foreign Matter Detection
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Solution Overview
Problem
Conventional resonance-type non-contact power supply systems cannot detect small foreign matters between the primary and secondary resonant coils, which can cause heat generation during power transmission.
Innovation Solution
A power transmission coil with a plane coil, a cover, a foreign-matter-detecting unit, and a power control circuit, where the cover has an inclining portion directing foreign matters to the detecting unit, allowing for accurate detection and prevention of power transmission when foreign objects are present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resonance-type non-contact power supply systems are used, then power transmission can be achieved, but small foreign matters cannot be detected and may cause heat generation
Solution Approach 1:
The patent introduces an inclining portion as an intermediary structure that guides foreign matters toward the detecting unit. This mediator facilitates the detection process by actively directing potential hazards to the sensing area, enabling reliable detection of small foreign matters that would otherwise be difficult to detect in non-contact power transmission systems
2Object-affected harmful factors
If foreign matter detection is implemented, then heat generation can be prevented, but device complexity increases
Solution Approach 1:
The patent combines the cover structure with the detection function by integrating the inclining portion directly into the cover. This merging of structural and functional elements allows foreign matter detection to be implemented without proportionally increasing device complexity, as the cover serves both protective and guiding functions
Solution Approach 2:
The inclining portion enables self-service detection by passively guiding foreign matters toward the detecting unit using gravity and geometry alone, without requiring additional active components or complex control mechanisms. The structure itself performs the detection facilitation function
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
Effectively detects small foreign matters that may generate heat and prevents heat generation by stopping power transmission, ensuring safe and efficient power transfer.
Implementation Method 1
a plane coil including a coil wound about a no-wire portion
Implementation Method 2
an inclining portion inclining toward the first foreign-matter-detecting unit
Data Source
AI summary
A power transmission coil includes a plane coil including a no-wire portion and a coil wound about a no-wire portion, a cover for covering the plane coil from above, a first foreign-matter-detecting unit provided at the no-wire portion, and a power control circuit electrically connected to the plane coil and the first foreign-matter-detecting unit. An upper surface of the cover has a first inclining portion inclining toward the first foreign-matter-detecting unit. The power control circuit transmits power through the plane coil if a foreign matter is not detected in the no-wire portion based on an output from the first foreign-matter-detecting unit. The power control circuit is configured to stop transmitting power through the plane coil if foreign matter is detected in the no-wire portion based on an output from the first foreign-matter-detecting unit. This power transmission coil is capable of detecting a small foreign matter that may generate heat.