PCB Conductor Rail Layout for Low-Inductance Power Modules
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Solution Overview
Problem
Power semiconductor module arrangements face challenges due to high stray inductances and complex precise positioning of elements, which affect their operation and assembly efficiency.
Innovation Solution
A printed circuit board with a dielectric insulation layer and conducting tracks is integrated into the module, where conductor rails are mechanically and electrically coupled to the substrate, with one end extending outside the housing, facilitating easier assembly and reducing stray inductances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductor rails are positioned precisely inside the housing, then electrical connection reliability is improved, but assembly complexity and positioning difficulty increase
Solution Approach 1:
The printed circuit board acts as an intermediary component that simplifies the assembly process. Conductor rails are mounted on the PCB using standard through-hole or surface-mount techniques, which are much easier than precise positioning inside the housing. The PCB then serves as a pre-assembled unit that can be easily positioned and connected to the substrate, thereby reducing assembly complexity while maintaining connection reliability.
Solution Approach 2:
The assembly is divided into separate functional modules: the conductor rails are pre-mounted on the PCB, and this entire assembly is then integrated into the housing with the substrate. This segmentation allows each component to be prepared and positioned independently, reducing the overall assembly complexity while ensuring reliable electrical connections.
2Volume of moving object
If module size is minimized, then compactness is improved, but stray inductance increases
Solution Approach 1:
The conductor rails are extended through the PCB to both sides, creating a three-dimensional conductive path that optimizes current flow. This dimensional arrangement allows the conductor rails to pass through the housing in an optimized path that minimizes loop area and stray inductance, while the overall module size remains compact due to the efficient use of vertical space.
Data Source
AI summary
A printed circuit board including a dielectric insulation layer having a top side facing a first side and a bottom side opposite the first side that faces a second side of the dielectric insulation layer, at least one conducting track formed on the dielectric insulation layer, and one or more conductor rails, wherein each of the one or more conductor rails is mechanically coupled to the dielectric insulation layer, and a first portion of each of the one or more conductor rails is arranged on the first side and a second portion of each of the one or more conductor rails is arranged on the second side of the dielectric insulation layer.