Induction Coil Shielding for Vehicle Underbody EMC
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Solution Overview
Problem
Inductive charging of motor vehicle batteries can cause electromagnetic interference that affects other electronic components, leading to malfunctions and requiring costly EMC enhancements.
Innovation Solution
A cover element with a shielding area, typically made of aluminum, is used to partially cover the induction coil on the vehicle's underbody, creating a trough to house the coil and limit electromagnetic radiation, thereby shielding nearby electrical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the induction coil is used for inductive charging, then contactless charging of the energy store is enabled, but electromagnetic radiation interferes with other electronic components
Solution Approach 1:
A cover element is introduced as an intermediary structure between the induction coil and the surrounding environment. This cover element includes a shielding area that acts as a mediator to block electromagnetic radiation from reaching electronic components, thereby resolving the interference problem while maintaining the contactless charging function
Solution Approach 2:
The shielding area of the cover element converts the harmful electromagnetic radiation into a contained field. By directing and confining the electromagnetic energy within the cover element structure, the harmful radiation is transformed into a controlled charging field that does not interfere with surrounding electronics
2Reliability
If additional shielding measures are implemented to protect electronic components, then electromagnetic compatibility is improved, but device complexity and cost increase
Solution Approach 1:
The cover element is designed to serve multiple functions simultaneously: it provides structural protection for the induction coil, acts as a shielding barrier against electromagnetic radiation, and contributes to the overall vehicle underbody design. This multi-functionality eliminates the need for separate shielding components, reducing complexity while maintaining EMC
Solution Approach 2:
The shielding function is merged with the cover element structure that already exists to protect the induction coil. By integrating the shielding area into the cover element itself, the patent combines protection and shielding into a single unified component, avoiding additional complexity
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 effectively reduces electromagnetic interference, minimizing disruptions to vehicle components and eliminating the need for additional shielding measures, while also providing efficient heat dissipation and impact protection.
Implementation Method 1
a magnetic field changing at a specific frequency is applied by means of the Primary coil constructed. This changing magnetic field charges the energy store (vehicle battery or high-voltage battery) of the motor vehicle via the secondary coil
Implementation Method 2
the cover element has a shielding area for shielding electromagnetic fields of the induction coil
Data Source
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AI summary
The invention relates to an arrangement of at least one induction coil (20) for inductively charging an energy accumulator on an underbody (10) of a motor vehicle (70). The induction coil (20) is at least partly covered towards the top in the vehicle height direction (12) by a covering element (22). The covering element (22) has at least one shielding region (24) for shielding electromagnetic fields of the induction coil (20). The invention also relates to a method for inductively charging an energy accumulator of a motor vehicle (70) using an induction coil (20) of the motor vehicle (70).