Inverter Capacitor and Filter Layout for Better Thermal Coupling
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Solution Overview
Problem
Existing inverters in electric vehicles face challenges in optimal layout and cooling efficiency due to separate assemblies of intermediate circuit capacitors and EMC filter units, leading to inefficient thermal connection and increased component size.
Innovation Solution
The method involves arranging filter assemblies and intermediate circuit capacitors optimally on busbars within an inverter housing and jointly fastening them using a potting compound for thermal and mechanical connection, allowing for a flexible and material-saving design by eliminating unnecessary directional changes and optimizing thermal paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate assemblies for intermediate circuit capacitors and filter units are used, then assembly flexibility is improved, but thermal connection efficiency deteriorates
Solution Approach 1:
The patent combines the intermediate circuit capacitor assembly and filter unit assembly into a single integrated assembly that is jointly fastened to the inverter housing. This merging eliminates the thermal isolation caused by separate polymer layer connections, creating direct thermal pathways from both components to the housing while maintaining assembly flexibility through the unified design.
2Ease of manufacture
If busbars are thermally connected through polymer layers, then ease of assembly is improved, but cooling efficiency deteriorates
Solution Approach 1:
By integrating the busbars into a unified assembly structure with direct housing contact points, the patent eliminates intermediate polymer thermal barriers. The busbars are positioned to establish direct thermal connection to the inverter housing, removing the thermal resistance of multiple polymer layers while preserving assembly simplicity through the integrated design approach.
Solution Approach 2:
The patent introduces a directly conductive thermal pathway as an intermediary between the busbars and housing, replacing the polymer layer intermediary. This new thermal conduit provides superior heat transfer while maintaining the ease of assembly through the pre-configured integrated structure.
3Device complexity
If filter unit busbars are not thermally connected to housing, then assembly complexity is reduced, but component size increases
Solution Approach 1:
The patent merges the filter unit assembly with the intermediate circuit capacitor assembly into a single integrated unit that is jointly fastened to the housing. This integration automatically establishes thermal connection for the filter unit busbars through the shared mounting structure, eliminating the need for separate thermal management designs and reducing busbar cross-section requirements.
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 approach enhances cooling efficiency, reduces component size, and improves thermal resistance and mechanical stability, enabling smaller busbar cross-sections and ferrite core designs while ensuring effective heat dissipation and mechanical protection.
Implementation Method 1
the filter assembly and the assembly for intermediate circuit capacitors are jointly fastened in the inverter housing or in a partial housing within the inverter housing by way of a potting compound, and are thermally connected
Implementation Method 2
subcomponents such as, e.g. the ferrite core, are adhesively bonded in a plastic carrier shell for the purposes of positioning
Data Source
AI summary
A method for producing an inverter incldues installing at least one filter assembly and one assembly for intermediate circuit capacitorsin an inverter housing on busbars. The individual components of the filter assembly and the assembly of the intermediate circuit capacitors are arranged optimally with respect to one another. The filter assembly and the assembly for intermediate circuit capacitors are jointly fastened in the inverter housing or a partial housing within the inverter housing using a potting compound and are thermally connected.