Contactless Power Feeding Device Temperature Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power feeding and receiving devices face challenges in accurately detecting the temperature of objects on the cover due to the positioning of temperature-sensitive sensors, leading to inconsistent detection results.
Innovation Solution
The design incorporates a temperature-sensitive detector positioned at a specific distance from the cover's surface, determined by the equation L ≤ λ × (T0 - T1)⁄5 × T1, ensuring accurate temperature detection of objects on the cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature-sensitive sensor is disposed on the cover or inside the cover at arbitrary positions, then the device structure is simple and easy to manufacture, but the temperature detection accuracy becomes insufficient
Solution Approach 1:
The patent applies parameter changes by establishing a specific mathematical relationship (equation 1) that defines the distance L from the cover surface to the temperature-sensitive detector based on thermal conductivity λ and temperature difference (T0-T1). This transforms the sensor positioning from an arbitrary placement to a precisely controlled parameter, ensuring accurate temperature detection while maintaining manufacturing feasibility through a clear design criterion.
Solution Approach 2:
The patent introduces the cover as an intermediary element between the temperature-sensitive detector and the object being measured. By positioning the detector inside the cover at a specifically calculated distance, the cover acts as a thermal mediator that allows accurate temperature sensing of external objects while providing structural support and protection for the detector.
2Measurement precision
If the temperature-sensitive detector is positioned too close to the cover surface, then the detection response is fast, but the detection accuracy of object temperature deteriorates
Solution Approach 1:
The patent resolves this contradiction by changing the positional parameter L to satisfy equation (1), which balances thermal coupling strength and temperature gradient effects. This optimized parameter ensures the detector is positioned at the optimal depth where it can accurately sense object temperature without excessive thermal interference from the cover itself, achieving both accuracy and acceptable response time.
3Measurement precision
If the temperature-sensitive detector is positioned deep inside the cover, then the detection accuracy improves, but the device structure becomes more complex and manufacturing difficulty increases
Solution Approach 1:
The patent applies parameter changes by defining a practical range for distance L through equation (1), where L is determined by material properties (thermal conductivity) and operating conditions (temperature difference). This transforms the manufacturing challenge into a materials selection and design parameter optimization problem, where the cover thickness and sensor depth are co-designed based on thermal properties, making manufacturing feasible while achieving accurate detection.
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 allows for precise temperature detection of objects on the cover, improving the reliability of overheating detection and power transmission systems.
Implementation Method 1
the thermal conductivity of the cover is denoted by λ [W/(m·K)], L satisfies the following equation (1)... L ≤ λ(T0-T1)÷5T1
Data Source
AI summary
A power feeding device includes a cover, a primary coil covered with the cover and provided in a predetermined direction with respect to the cover, and a temperature-sensitive detector that detects the temperature of an object on the cover. When the distance from the surface of the cover to the temperature-sensitive detector in the predetermined direction is denoted by L [m], the temperature of the object to be subjected to thermometry by the temperature-sensitive detector is denoted by T0 [K], the temperature to be detected by the temperature-sensitive detector is denoted by T1 [K], and the thermal conductivity of the cover is denoted by λ [W/(m·K)], L satisfies the following equationL≤λ×(T0-T1)5×T1.(1)This allows the temperature of the object on the cover to be accurately detected.