Inductive Power Transfer Pad Frame for Heat and Eddy Loss Control
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Solution Overview
Problem
Traditional wireless power transfer (WPT) pads face challenges with heat dissipation and eddy current losses due to galvanic insulation frames, which while improving heat dissipation, compromise magnetic coupling coefficients and induce additional losses.
Innovation Solution
Incorporating a metallic frame and a frame magnetic sheet between the metallic frame and the cover, made from ferromagnetic, ferrimagnetic, or nanocrystalline materials, to enhance heat dissipation while maintaining coupling coefficients and reducing eddy current losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If galvanic insulation frames are used in traditional WPT pads, then heat dissipation is improved, but coupling coefficients decrease and eddy current losses increase
Solution Approach 1:
A magnetic sheet is introduced as an intermediary component between the metallic frame and the cover. This magnetic sheet mediates the interaction between the metallic frame and the magnetic field, allowing the metallic frame to provide heat dissipation while the magnetic sheet prevents excessive eddy current losses and maintains coupling coefficients
Solution Approach 2:
The patent uses a composite structure combining metallic frame material with magnetic sheet material. The metallic frame provides thermal conduction for heat dissipation, while the magnetic sheet provides magnetic properties to maintain coupling and reduce eddy current losses, creating a composite solution that addresses multiple conflicting requirements
2Temperature
If metallic frames are used to improve heat dissipation, then temperature control is improved, but coupling coefficients are compromised
Solution Approach 1:
The magnetic sheet serves as an intermediary between the metallic frame and the magnetic field path. It allows the metallic frame to conduct heat while the magnetic sheet maintains the magnetic coupling by providing a low-reluctance path for magnetic flux, thus preserving coupling coefficients despite the presence of the metallic frame
3Reliability
If traditional galvanic insulation frames are used, then magnetic coupling is maintained, but heat dissipation is insufficient
Solution Approach 1:
The patent merges the functions of the frame (structural support and heat dissipation) with the magnetic sheet (magnetic coupling enhancement). By combining these two components working together, the system achieves both good heat dissipation through the metallic frame and maintained coupling coefficients through the magnetic sheet, resolving the contradiction between these two requirements
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
The solution effectively improves heat dissipation and reduces eddy current losses in WPT pads, maintaining a sufficient coupling coefficient and enhancing the efficiency of power transfer.
Implementation Method 1
The frame magnetic sheet redirects magnetic flux to improve coupling
Implementation Method 2
improves heat dissipation
Implementation Method 3
a primary coil in the transmitter is energized by AC currents, which generate time-varying magnetic fields or magnetic flux. The strength of the generated magnetic field depends on AC currents and permeability of space in accordance with Ampere's Law
Implementation Method 4
A portion of the generated time-varying magnetic field links with a pick-up coil in the receiver side to induce voltages according to Faraday's Law
Implementation Method 5
losses on metallic objects due to eddy currents
Data Source
AI summary
A WPT transmitter pad comprising: a cover, a coil, a metallic frame, and a frame magnetic sheet between the metallic frame and the cover.