Induction Charging Ferrite Plate and Metal Shielding Distance
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Solution Overview
Problem
Induction charging devices for electric vehicles face challenges in reducing electromagnetic field emissions and optimizing energy transmission due to interactions between ferrite and metal shielding plates, which can lead to increased losses and unwanted heating.
Innovation Solution
An induction charging device design featuring a temperature-control assembly with a fluid pipe that acts as a metal shielding plate, secured to a ferrite plate at a defined distance using a stiffening insert, optimizing the shielding effect and energy transmission while reducing negative interactions between the plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal shielding plate is used to reduce electromagnetic field emissions, then electromagnetic field emissions are reduced, but charging losses increase and unwanted heating occurs due to eddy currents
Solution Approach 1:
The patent introduces a ferrite plate as an intermediary component between the charging coil and the metal shielding plate. This ferrite plate serves as a magnetic flux guide that directs the electromagnetic field, reducing the need for a large metal shielding plate and thereby minimizing eddy current losses while maintaining electromagnetic field shielding effectiveness.
Solution Approach 2:
The patent optimizes the distance between the ferrite plate and the metal shielding plate to a specific range (5-20mm). This parameter optimization balances the shielding effect against the generation of eddy currents, achieving effective electromagnetic field reduction while minimizing energy losses and unwanted heating.
2Object-affected harmful factors
If a metal shielding plate is placed close to the ferrite plate to improve shielding effect, then electromagnetic field emissions are reduced, but the negative interaction between the plates increases
Solution Approach 1:
The patent specifies an optimal distance range of 5-20mm between the ferrite plate and the metal shielding plate. This parameter control prevents excessive interaction between the two plates that would cause eddy currents and heating, while maintaining sufficient shielding effectiveness. The stiffening insert helps maintain this critical distance.
Solution Approach 2:
The ferrite plate acts as a mediator that guides magnetic flux away from the metal shielding plate, reducing the direct interaction between the two components. This intermediary function allows the plates to be positioned closer for better shielding without causing excessive negative interactions.
3Object-affected harmful factors
If the distance between the metal shielding plate and ferrite plate is reduced to optimize shielding, then electromagnetic field emissions are reduced, but eddy currents increase causing unwanted heating
Solution Approach 1:
The patent optimizes the distance between the ferrite plate and metal shielding plate to 5-20mm, which is sufficient to reduce eddy current generation and unwanted heating while maintaining effective electromagnetic field shielding. This distance parameter is critical in balancing shielding performance against thermal effects.
Solution Approach 2:
The ferrite plate serves as a magnetic flux guide that redirects electromagnetic fields, reducing the intensity of fields reaching the metal shielding plate. This intermediary action minimizes eddy current generation and associated heating while preserving shielding effectiveness.
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 design enhances the efficiency of the induction charging device by minimizing electromagnetic field emissions and optimizing energy transmission, ensuring effective shielding and heat dissipation, thereby improving the overall performance and reducing losses.
Implementation Method 1
An external primary coil is thereby inductively coupled to a secondary coil in the motor vehicle. An alternating current, which generates an electromagnetic alternating field around the primary coil, flows through the primary coil.
Implementation Method 2
the electromagnetic alternating field around the secondary coil is influenced by a magnetic ferrite plate
Implementation Method 3
The field emissions can be reduced with a metal plate or with a shielding plate, respectively, mostly made of aluminum
Implementation Method 4
The fluid pipe of the temperature-control assembly is heat-conductingly secured to the ferrite plate on the vehicle side, such that the waste heat from the ferrite plate and from the charging coil can be transmitted to the fluid in the fluid pipe
Implementation Method 5
A negative effect of eddy currents generated in the metal shielding plate on the electromagnetic alternating field directed with the ferrite plate
Data Source
AI summary
An induction charging device for an electrically operated motor vehicle includes a charging assembly having a charging coil, and a temperature-control assembly having a fluid pipe. The charging coil can be inductively coupled to a primary coil, such that a battery in the motor vehicle can be inductively charged. The charging assembly has a ferrite plate for directing the electromagnetic alternating field, which is established between the charging coil and the fluid pipe, such that waste heat from the ferrite plate and the charging coil can be transmitted to the fluid in the fluid pipe. The fluid pipe is formed by a shell-type metal shielding plate for shielding electromagnetic field emissions and a shell-type lower shell heat-conductingly in contact with the ferrite plate. The metal shielding plate and the lower shell are secured on one another in a fluid-tight manner and spaced apart from one another with a stiffening insert.