Heating Plate Shielding Layer Design for Electromagnetic Compatibility
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Solution Overview
Problem
Conventional heating plates in vehicles face challenges in meeting electromagnetic compatibility requirements due to interference currents generated during pulse-width-modulated operation at high voltages.
Innovation Solution
A heating plate design featuring an electrically conductive shielding layer between the substrate and the heating layer, which is connected to ground to dissipate interference currents, thereby improving electromagnetic compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If pulse-width modulation at high voltages is used in heating plates, then heating performance is improved, but electromagnetic compatibility deteriorates due to interference currents
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the heating layer and the substrate. This shielding layer acts as a mediator that intercepts and redirects interference currents generated during pulse-width-modulated operation, preventing them from flowing uncontrollably to other system components while maintaining the high-voltage heating performance.
Solution Approach 2:
The harmful interference currents are extracted and isolated from the main heating circuit by introducing a separate shielding layer. This layer specifically targets and removes the electromagnetic interference component while allowing the heating function to continue operating at high voltage without compromise.
2Object-affected harmful factors
If a shielding layer is added to eliminate interference currents, then electromagnetic compatibility is improved, but device complexity increases
Solution Approach 1:
The shielding layer is designed to serve multiple functions simultaneously: it provides electromagnetic shielding to block interference currents, acts as an additional insulation layer for electrical safety, and can be integrated with existing substrate structures. This multi-functionality approach improves electromagnetic compatibility without proportionally increasing device complexity.
Solution Approach 2:
The shielding layer is implemented as a thin film or flexible layer that can be easily applied to the substrate surface. This thin-film approach provides effective electromagnetic shielding while minimizing the increase in overall device thickness and structural complexity, making the solution economically viable.
3Object-affected harmful factors
If additional insulation layers and shielding layer are added, then electromagnetic compatibility is improved, but manufacturing cost increases
Solution Approach 1:
The shielding layer and insulation layers are merged into a single integrated multi-layer structure that can be manufactured in one process sequence. By combining these protective layers into a unified construction, the patent reduces the number of separate manufacturing steps and material handling operations, thereby controlling production costs while achieving the required electromagnetic compatibility.
Solution Approach 2:
The patent employs composite material structures where the shielding layer and insulation layers are combined into a single multi-material construction. This composite approach allows for optimized material selection and integrated manufacturing processes, reducing overall production costs compared to assembling separate components while maintaining the necessary electromagnetic shielding and insulation properties.
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 proposed design significantly enhances the electromagnetic compatibility of heating plates and heating devices by effectively dissipating interference currents, thus ensuring safe and reliable operation at high voltages.
Implementation Method 1
an electrically conductive shielding layer is arranged between the substrate and the heating layer. A first insulation layer thus lies on the substrate, the insulation layer being covered by the shielding layer. The shielding layer bears a second insulation layer on which the heating layer is arranged.
Implementation Method 2
the heating layer forms a capacitance to the substrate. An interference current therefore occurs in pulse-width-modulated operation with a high pulse frequency and high voltage
Data Source
AI summary
Described is a heating plate having a substrate made of metal, a heating layer and an insulation layer which is arranged between the heating layer and the substrate. It is provided according to this disclosure that the insulation layer bears an electrically conductive shielding layer and that the shielding layer is covered by a second insulation layer on which the heating layer lies. In addition, a flow heater having such a heating plate is disclosed.