Semiconductor Control Terminal Low-Rigidity Portion Positioning
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Solution Overview
Problem
The positioning accuracy of independent control terminals in power semiconductor modules is compromised due to variations in bonding and tolerance issues, leading to reduced precision in terminal placement.
Innovation Solution
Incorporating a low-rigidity portion in the control terminal design, which allows for precise positioning and fixation using a resin block within the resin case, preventing vertical movement and enhancing horizontal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If independent terminals are used to extend outwardly through resin case openings, then ease of operation and connectivity are improved, but positioning accuracy deteriorates due to bonding variations and tolerance issues
Solution Approach 1:
The control terminal is divided into distinct functional segments: a rigid lower portion for bonding to the circuit board, a low-rigidity intermediate portion for absorption of positioning errors, and an upper portion for precise connection. This segmentation allows each part to fulfill its specific function while compensating for manufacturing variations in the independent terminal structure
Solution Approach 2:
The rigidity parameter of the control terminal is varied along its length, with the intermediate portion having specifically reduced rigidity compared to other sections. This parameter change enables the terminal to flexibly adapt to positioning variations while maintaining connection stability, directly addressing the positioning accuracy problem
2Ease of manufacture
If clearances are provided between control terminal and resin case opening for tolerance accommodation, then ease of manufacture is improved, but positioning accuracy deteriorates
Solution Approach 1:
The low-rigidity intermediate portion acts as a mediator between the rigid bonding portion and the upper connection portion. It absorbs the dimensional variations and clearance issues between the control terminal and resin case opening, allowing tolerance accommodation without compromising the positioning accuracy of the upper terminal end
3Manufacturing precision
If resin block is inserted to press-fix control terminal against side wall, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The positioning and fixation function is extracted from the main control terminal body and implemented through a separate, simple resin block component. This resin block is inserted into the resin case to press-fix the control terminal, providing the necessary positioning accuracy while keeping the additional component simple and the overall device complexity manageable
Data Source
AI summary
A semiconductor device 10 includes: multi-layered substrates 12 each having a circuit board 12c; control terminals 14 whose one end is fixed on the circuit board 12c of each multi-layered substrate 12; a resin case 15 which has openings 20 and is arranged to cover the multi-layered substrates 12, through which openings 20 the other ends of the control terminals 14 extend outwardly; and resin blocks 18 which are each inserted into the openings 20 of the resin case 15 and press-fixes the control terminals 14 against the side walls of the respective openings 20. The control terminals 14 each have a low-rigidity portion 14j at a position that is further interior of the resin case 15 than a position where each control terminal 14 is in contact with the resin block 18 in the respective openings 20 of the resin case 15.