In-Motion Power Transfer Control for Leakage Magnetic Field Limits
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Solution Overview
Problem
Existing power supply systems for vehicles during traveling face challenges in maintaining an allowable leakage magnetic field, particularly in varying environments such as expressways and general roads with different foot traffic levels, leading to inconsistent power transmission efficiency.
Innovation Solution
A control device that determines the category of power transmitting and receiving devices, detection range of foreign object detection units, and positional relationships to adjust the upper limit of power transmission, ensuring the leakage magnetic field remains within permissible limits by optimizing the magnetic field resonance and coil configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power transmission is increased to improve charging efficiency, then power transmission speed is improved, but leakage magnetic field exceeds allowable values
Solution Approach 1:
The patent applies dynamics by making the power transmission limit variable rather than fixed. The control device dynamically adjusts the upper limit of power transmission based on real-time detection results of the foreign object detection unit. When no foreign objects are detected or detection results indicate safety, higher power transmission is permitted to improve charging efficiency. When foreign objects are detected or magnetic field levels are high, the system automatically reduces the power transmission limit to keep leakage magnetic field within allowable values, thus resolving the contradiction between transmission speed and magnetic field safety.
Solution Approach 2:
The patent applies parameter changes by modifying the power transmission parameter (upper limit of power) based on detection parameters. The control device changes the power transmission parameter dynamically according to foreign object detection results and magnetic field measurements. This allows the system to optimize power transmission speed while ensuring leakage magnetic field remains within safe limits by adjusting the power parameter in response to changing environmental conditions.
2Reliability
If foreign object detection range is expanded to improve safety, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the foreign object detection unit to perform multiple functions simultaneously. The detection unit not only detects foreign objects but also monitors magnetic field levels and provides data for determining the upper limit of power transmission. This multi-functional approach improves safety through comprehensive monitoring while avoiding the need for separate dedicated systems for each function, thus managing device complexity effectively.
Solution Approach 2:
The patent applies feedback by implementing a closed-loop control system where the foreign object detection unit continuously monitors the environment, and the control device adjusts power transmission based on detection results. The detection results feed back to the control device, which then modifies power transmission parameters accordingly. This feedback mechanism ensures safety by continuously monitoring for foreign objects and adjusting power levels, while the automated nature of the feedback loop avoids requiring complex manual intervention systems.
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
Enables efficient and safe power transmission to vehicles while adhering to allowable leakage magnetic field values, accommodating different installation locations and traffic conditions.
Implementation Method 1
a primary coil disposed on the substrate and generates magnetic flux using alternating current
Data Source
AI summary
The control device for power supply during traveling includes a processor, and the processor determines the type of power transmitting device that transmits power to the vehicle while the vehicle is running, the type of power receiving device installed in the vehicle, and the foreign object detection unit installed in the power transmitting device. An upper limit of power to be transmitted from the power transmitting device to the power receiving device is determined based on the detection range of the means and the positional relationship between the power transmitting device and the power receiving device.