Power Module Housing with Aligned Fasteners for PCB Space Saving
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Solution Overview
Problem
The existing housing designs for power semiconductor modules hinder easy mounting on heat sinks or base plates due to the obstruction caused by printed circuit boards, which require large through holes for screw insertion, thereby consuming valuable space needed for conducting tracks.
Innovation Solution
The design incorporates a housing with protrusions and holding devices that allow fastening elements to be secured and aligned vertically, enabling the use of smaller second through holes on the printed circuit board, allowing more space for conducting tracks by eliminating the need for large holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If large through holes are provided in the printed circuit board for screw insertion, then the housing can be mounted on a heat sink or base plate, but valuable space on the printed circuit board needed for forming conducting tracks is consumed
Solution Approach 1:
The patent introduces holding devices as intermediary components that hold the fastening elements (screws) before insertion. These holding devices are positioned on the housing and allow the screws to be held and aligned without requiring large through holes in the printed circuit board. The holding devices act as mediators between the housing and the fastening elements, enabling mounting operations while preserving PCB space for conducting tracks.
Solution Approach 2:
The patent moves the fastening element storage and alignment function from the printed circuit board plane to the housing structure. By providing holding devices on the housing that extend into the vertical dimension, the solution allows screw insertion without compromising the horizontal space on the printed circuit board. This dimensional shift resolves the conflict between mounting accessibility and PCB space utilization.
2Volume of moving object
If the printed circuit board is positioned close to the housing, then space efficiency is improved, but the insertion of screws into boreholes is impeded and fastening operations become difficult
Solution Approach 1:
The holding devices perform preliminary action by pre-positioning and aligning the fastening elements with the boreholes in the housing before the actual fastening operation. This preliminary alignment eliminates the need for large clearance spaces between the printed circuit board and housing, as the screws are already correctly positioned. The holding devices ensure that fastening operations can be performed efficiently even in compact configurations.
Solution Approach 2:
The holding devices serve as intermediaries that bridge the gap between the compact housing-PCB arrangement and the fastening operation. They provide the necessary alignment and access mechanisms without requiring increased spacing, thus maintaining module compactness while enabling easy fastening operations.
3Adaptability or versatility
If through holes are provided in protrusions on the housing, then mounting on heat sink or base plate is enabled, but the printed circuit board must have large holes which reduces space for conducting tracks
Solution Approach 1:
The holding devices act as intermediaries that enable mounting capability through the housing protrusions without requiring corresponding large holes in the printed circuit board. The holding devices are positioned on the housing protrusions and hold the fastening elements, allowing mounting operations to proceed while the printed circuit board maintains its integrity and available area for conducting tracks.
Solution Approach 2:
The patent segments the mounting function from the printed circuit board structure. The holding devices on the housing protrusions handle the mounting function, while the printed circuit board focuses on its primary function of electrical connections. This segmentation allows the PCB to have minimal or no holes, preserving its area for conducting tracks while maintaining full mounting capability through the housing structure.
Data Source
AI summary
An arrangement includes a housing and a printed circuit board (PCB) arranged vertically above the housing. The housing includes: at least one protrusion attached to sidewalls and arranged on an outside of the housing at a lower end with at least one first through hole provided in the protrusion; holding devices each arranged inside a first through hole and/or between the PCB and the first through hole; and fastening elements configured to attach the housing to a heat sink or base plate. Each holding device is configured to clamp a corresponding fastening element such that the fastening elements are secured in defined positions, and to align each fastening element with a different first through hole. The PCB includes second through holes each arranged vertically above and aligned with a different fastening element. A diameter of each second through hole is less than the largest diameter of the respective fastening element.