Grounded Heating Rib Shielding for High-Voltage Vehicle Heaters
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Solution Overview
Problem
Electric heating devices in vehicles with high voltage systems generate significant electromagnetic interfering radiation due to high frequency alternating current components, which can interfere with other vehicle systems and devices like radios, and existing solutions like metallic grids cause airflow losses.
Innovation Solution
The metallic heating rib structures are electrically connected to the vehicle ground, and the control electronics unit is housed in a shield connected to the ground, along with additional metallic shielding strips, to create a continuous electromagnetic shield without using a surrounding metallic grid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metallic grid is used to shield the heating device, then electromagnetic shielding is improved, but airflow losses increase
Solution Approach 1:
The patent combines the electromagnetic shielding function with the existing metallic heating rib structures by electrically connecting them to vehicle ground. This merging eliminates the need for a separate metallic grid, achieving electromagnetic shielding without the airflow losses that would result from placing a grid in the air flow path.
Solution Approach 2:
The metallic heating rib structures serve dual functions: they provide heating functionality and simultaneously act as electromagnetic shields when connected to ground. This multi-functionality allows the same structure to address both heating requirements and electromagnetic interference protection without requiring additional components that would impede airflow.
2Object-affected harmful factors
If the metallic heating rib structures are connected to vehicle ground, then electromagnetic shielding is achieved, but the complexity of electrical connections increases
Solution Approach 1:
The grounding connections for electromagnetic shielding are merged with the existing electrical connections of the heating system. The metallic heating rib structures are already part of the heating circuit, and by utilizing their existing electrical pathways to ground, the patent achieves shielding without requiring separate grounding infrastructure, thus minimizing 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 configuration effectively reduces electromagnetic interfering radiation, ensuring safe operation of vehicle systems while maintaining airflow efficiency by eliminating the need for a metallic grid, thus enhancing the electromagnetic shielding without compromising heating performance.
Implementation Method 1
The metallic heating rib structures are electrically connected to a fixed reference potential, in particular vehicle ground... It will then be the metallic heating rib structures that will effect an electromagnetic shielding of the heating device
Implementation Method 2
PTC heating elements are used which are arranged between current rails that extend opposite each other, which means electric resistance elements having a positive temperature coefficient, which are fed with supply current from a control electronics unit
Implementation Method 3
Metallic heating rib structures are respectively coupled to each of the current rails by means of an electrically insulating but thermally conducting coupling layer
Data Source
AI summary
In the heating device, PTC heating elements arranged between current rails lying opposite each other are used, which are fed with supply current from a control electronics unit via the current rails. Metallic heating rib structures are respectively coupled to one of the current rails via an electrically insulating but thermally conducting coupling layer. The air to be heated flows through the heating rib structures which have an undulating shape. The metallic heating rib structures are electrically connected to vehicle ground and thus form a shield that eliminates emissions of electromagnetic interfering radiation without impeding the flow of air.