Rotatable Ferrite Shielding for EV Induction Charging Thermal Management
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Solution Overview
Problem
Induction charging devices for electric vehicles generate electromagnetic field emissions that require shielding, leading to waste heat in metal plates, which is not effectively utilized when the vehicle is not in operation and is relatively low due to small currents and high voltages.
Innovation Solution
The induction charging device incorporates a ferrite assembly with rotatable ferrite plates that adjust between closed and open positions to control electromagnetic field shielding, allowing adaptable waste heat generation and utilization, with a temperature-control assembly to manage and utilize the heat through a fluid system for preheating vehicle components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal shielding plate is used to block electromagnetic field emissions, then electromagnetic shielding effectiveness is improved, but waste heat generation increases
Solution Approach 1:
The ferrite assembly is divided into multiple rotatable ferrite plates that can be independently positioned. These segmented ferrite plates create localized magnetic shielding zones that redirect electromagnetic fields away from the metal plate in specific charging scenarios, reducing overall heat generation while maintaining shielding where needed.
Solution Approach 2:
The ferrite plates are made rotatable to dynamically adjust the shielding configuration based on charging requirements. During high-power charging, ferrite plates rotate to shield the metal plate and reduce heat. During low-power charging or vehicle operation, ferrite plates rotate away to allow heat generation for warming the coolant, enabling adaptive thermal management.
2Object-affected harmful factors
If electromagnetic field shielding is maximized to protect electronic devices, then shielding effectiveness is improved, but waste heat utilization is worsened
Solution Approach 1:
The system dynamically switches between two operational modes: In charging mode, ferrite plates rotate to shield the metal plate for effective electromagnetic blocking. In vehicle operation mode, ferrite plates rotate away to enable heat generation that warms the coolant, converting previously wasted heat into useful thermal energy for cabin heating or engine warm-up.
Solution Approach 2:
The invention converts the harmful waste heat generated in the metal shielding plate into a beneficial resource by using it to warm the vehicle coolant system. This transforms an energy loss into a useful function, particularly valuable during cold weather operation or engine start-up.
3Temperature
If ferrite plates are positioned to shield the metal plate, then waste heat generation is reduced, but charging power may be affected
Solution Approach 1:
The ferrite assembly consists of multiple discrete rotatable plates rather than a single fixed structure. This segmentation allows selective positioning where ferrite plates can be rotated to provide shielding in specific zones during high-power charging, reducing heat generation in critical areas while maintaining electromagnetic coupling efficiency for optimal charging power transfer.
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 solution enables efficient management of waste heat, allowing it to be used for preheating vehicle components, such as lubricating oil or the interior, while maintaining high charging power during operation and reducing heat-related damage to power electronics.
Implementation Method 1
An alternating current flows through the primary coil which generates an electromagnetic field about the primary coil. The electromagnetic field induces an alternating current in the secondary coil
Implementation Method 2
the electromagnetic field about the secondary coil is influenced by a magnetic ferrite plate
Implementation Method 3
During the shielding of the electromagnetic field, eddy currents are generated in the metal plate which can lead to a severe heat development in the metal plate
Implementation Method 4
a cooling arrangement through which a cooling fluid can flow can be heat-transmittingly arranged on the metal plate, so that the waste heat generated in the induction charging device is transferred via the metal plate to the cooling fluid
Data Source
AI summary
An induction charging device for an electrically operated motor vehicle may include at least one charging assembly. The at least one charging assembly may include a charging coil, a ferrite assembly, a metal shielding plate, and a temperature-control assembly through which a fluid is flowable. The charging coil may be inductively couplable to a primary coil such that a motor vehicle battery is inductively chargeable. The ferrite assembly may include a plurality of rotatable ferrite plates arranged next to one another. When in a closed position, a respective ferrite plate may be arranged parallel to the charging coil and may shield the metal shielding plate from the charging coil. When in an open position, the respective ferrite plate may be arranged at an angle relative to the charging coil and may partially shield the metal shielding plate from the charging coil.