Structured Bus Bar Contact for Oxide-Breaking Power Modules
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Solution Overview
Problem
Existing power semiconductor module arrangements face challenges in ensuring reliable and efficient electrical contact between internal and external bus bars due to the formation of oxide layers, which reduces conductivity and makes it difficult to determine the actual contact area.
Innovation Solution
The implementation of a bus bar with a structured area featuring a plurality of protrusions on its second end, where each protrusion is between 10 μm and 1000 μm in height, enhances the distribution of pressure for better contact and reliably disrupts the oxide layer, thereby improving electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat contact surface is used between bus bars, then the manufacturing process is simple, but the electrical conductivity is reduced due to oxide layers and uneven pressure distribution
Solution Approach 1:
The bus bar contact surface is designed with localized protrusions (ridges) that concentrate the contact area into specific regions. This local quality change ensures that pressure is applied precisely where needed to disrupt oxide layers and establish reliable electrical contact, while the rest of the surface remains simpler in structure.
Solution Approach 2:
The contact surface features curved or rounded protrusions rather than sharp edges. This curvature helps distribute pressure more effectively across the contact interface, ensures better mechanical contact, and facilitates the disruption of oxide layers through rolling or pressing action during assembly.
2Reliability
If pressure is concentrated at a single contact point, then the force application is simple, but the contact area is insufficient for reliable electrical connection
Solution Approach 1:
The contact surface is segmented into multiple protrusions distributed across the bus bar surface. Each protrusion acts as an independent contact point that concentrates pressure locally, while the collective array of protrusions ensures sufficient total contact area for reliable electrical connection. This segmentation allows force to be distributed across multiple zones rather than concentrated at a single point.
3Reliability
If the bus bar surface is made rough to disrupt oxide layers, then electrical contact is improved, but the manufacturing precision becomes more difficult to control
Solution Approach 1:
The protrusions are pre-formed on the bus bar surface during manufacturing, creating the necessary surface irregularities before assembly. This preliminary action ensures that oxide layer disruption capability is built into the component itself, eliminating the need for post-manufacturing surface treatment while maintaining controlled manufacturing tolerances through standardized protrusion geometries.
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 design ensures a more stable and predictable electrical connection by distributing pressure effectively over a defined contact area, enhancing conductivity and reducing the impact of oxide layers, thus improving the performance of power semiconductor modules.
Implementation Method 1
The structured area with protrusions enhances pressure distribution and reliably disrupts the oxide layer, thereby improving electrical conductivity
Data Source
AI summary
A bus bar for a power semiconductor module arrangement includes a first end, and a second end. The first end is configured to be arranged inside a housing of the power semiconductor module arrangement. The second end is configured to be arranged outside of the housing and to be electrically contacted by an external bus bar. The second end includes a structured area that includes a plurality of protrusions. A height of each of the protrusions is between 10 μm and 1000 μm.