Semiconductor Module Bus Bar Housing Inspection Openings
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Solution Overview
Problem
Existing semiconductor modules do not allow for visual inspection of bus bar joint portions after the housing is attached, making it difficult to verify the integrity of the connections between the bus bar and semiconductor devices.
Innovation Solution
A semiconductor module design featuring a plate-shaped bus bar with upright and bent portions integrated with a plastic housing, which includes openings for visual inspection of the joint portions between the bus bar and semiconductor devices, allowing for post-attachment verification of solder joints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is attached to enclose the wiring substrate and semiconductor devices, then the module structure is completed and protected, but the joint portions of the bus bar become hidden and cannot be visually checked
Solution Approach 1:
The housing is segmented with specific opening portions that selectively expose the joint portions of the bus bar to the external environment. This segmentation allows the housing to simultaneously provide enclosure protection and visual access for inspection, resolving the contradiction between structure completion and inspection accessibility.
Solution Approach 2:
The opening portions in the housing act as intermediaries between the internal joint portions and the external inspection environment. These openings enable visual detection of joint quality without compromising the protective enclosure function of the housing, allowing simultaneous achievement of both enclosure and inspection goals.
2Device complexity
If the bus bar is integrated with the housing, then the number of components is reduced and assembly is simplified, but the joint portions become hidden behind the housing
Solution Approach 1:
The housing is divided into enclosed portions and opening portions, where the opening portions specifically expose the bus bar joint areas. This segmentation maintains the integration benefit of reduced component count while creating visual access paths for joint inspection.
Solution Approach 2:
The housing has different properties in different locations: most areas provide full enclosure, while specific local areas (opening portions) provide visual access to joint portions. This local differentiation allows the integrated structure to simultaneously achieve component reduction and joint visibility.
3Reliability
If the housing fully encloses the wiring substrate, then protection and structural completeness are achieved, but inspection of connection integrity requires disassembly
Solution Approach 1:
The housing is segmented with opening portions that provide continuous visual access to joint portions without requiring disassembly. This segmentation enables inspection to be performed on the assembled module, simplifying the manufacturing process while maintaining protection.
Solution Approach 2:
The housing design enables self-inspection capability, where the joint portions remain visible through opening portions during the assembly process. This eliminates the need for additional disassembly steps for inspection, allowing the module to essentially inspect itself during manufacturing.
Data Source
AI summary
A semiconductor module includes a wiring substrate and two semiconductor devices mounted on the wiring substrate. The semiconductor module includes a housing having a rectangular frame body including four side walls. The housing includes a beam that bridges first side walls. A bus bar includes two end portions, upright portions each extending from one of the end portions in the thickness direction of an insulating substrate, bent portions each extending continuously with one of the upright portions, and an extension extending continuously with the bent portions. A section of the extension is embedded in the housing.