Power Receiving Coil Shield for Capacitor Stability
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Solution Overview
Problem
The alignment of power transmitting and receiving coils in non-contact power transmission devices can be misaligned, leading to reduced efficiency due to the placement of capacitors adjacent to the coils, which are affected by magnetic or electric fields and heat, causing variations in resonant frequency and capacitance.
Innovation Solution
A power receiving device with a shield positioned between the power receiving coil and capacitor, aligned in the direction of the coil's central axis, to suppress electromagnetic field transmission and heat transfer, ensuring proper alignment and reducing eddy current loss and heat convection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the capacitor is arranged adjacent to the power receiving coil in the front-back direction to match center lines, then alignment between power transmitting and receiving coils is improved, but the capacitor is affected by electromagnetic fields and heat causing variation in resonant frequency
Solution Approach 1:
The housing is divided into a first housing containing the power receiving coil and a second housing containing the capacitor, physically separating the capacitor from the electromagnetic field source while maintaining alignment through coordinated positioning of both housings
Solution Approach 2:
A shield is introduced as an intermediary component between the power receiving coil and the capacitor to block electromagnetic fields and heat transfer, protecting the capacitor while allowing the system to maintain optimal alignment
2Reliability
If the capacitor is arranged adjacent to the power receiving coil in the width direction to reduce electromagnetic field exposure, then capacitor stability is improved, but misalignment occurs between power transmitting and receiving coils reducing power transmission efficiency
Solution Approach 1:
The system is segmented into two independently positionable housings that can be optimized for their respective functions while maintaining overall system alignment through coordinated mounting
Solution Approach 2:
The shield acts as a mediator that enables the capacitor to be positioned optimally for stability while the first housing with the coil maintains optimal alignment for power transmission, with the shield bridging the spatial separation
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 power transmission efficiency by maintaining capacitor stability, reducing variations in resonant frequency, and minimizing heat transfer, thereby improving alignment and overall power transfer efficiency.
Implementation Method 1
a shield arranged between the power receiving coil and the capacitor
Implementation Method 2
heat transfer from the power receiving coil to the capacitor can also be suppressed
Implementation Method 3
a power receiving coil formed to surround space around a coil central axis extending in a front-back direction of a vehicle body, for receiving electric power from a power transmitting coil in a non-contact manner
Implementation Method 4
The capacitor is located at a position to form a resonant circuit together with the coil so as to increase power transmission efficiency
Data Source
AI summary
A power receiving device includes a power receiving coil formed to surround space around a coil central axis extending in a front-back direction of a vehicle body, for receiving electric power from a power transmitting coil in a non-contact manner while facing the power transmitting coil, a capacitor arranged adjacent to the power receiving coil in the direction in which the coil central axis extends, and a shield arranged between the power receiving coil and the capacitor. The effect on the capacitor during electric power transmission can be reduced.