Resistive Element Zigzag Contact Asymmetry
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Solution Overview
Problem
Existing resistive elements with fixed-sized contact holes lead to uneven current distribution, resulting in performance inequality and reduced resistance to surge current due to concentrated current at inner contacts and reduced current at outer contacts.
Innovation Solution
A resistive element design with larger effective contact areas, featuring first and second outer contacts and inner contacts arranged in a zigzag pattern, where the first inner contact is partly opposed to the second outer contact, and the second inner contact is partly opposed to the first outer contact, ensuring uniform current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple contacts are provided with fixed sizes, then contact resistance variation is reduced, but current distribution becomes uneven with concentration at inner contacts
Solution Approach 1:
The patent applies asymmetry by arranging contacts in a zigzag pattern where inner contacts are offset relative to outer contacts. Specifically, odd-numbered contacts and even-numbered contacts are positioned at different longitudinal locations along the resistive layer, creating an asymmetric configuration that distributes current more evenly across all contacts rather than concentrating it at the inner contacts.
2Reliability
If inner contacts are positioned closer to the middle of the resistive layer, then contact resistance is reduced, but current components in outer contacts are reduced
Solution Approach 1:
The patent resolves this contradiction by introducing a longitudinal dimension to the contact arrangement. Instead of positioning all contacts at the same longitudinal location, the invention offsets inner and outer contacts along the length of the resistive layer. This dimensional change allows inner contacts to maintain low contact resistance while outer contacts are positioned to capture adequate current components, achieving both goals simultaneously.
Data Source
AI summary
A resistive element includes: a resistive layer having a rectangular shape defined by a resistance length direction and a resistance width direction orthogonal to the resistance length direction; a first outer contact and a first inner contact allocated on one side of the resistive layer defined in the resistive length direction; and a second outer contact and a second inner contact allocated on another side of the resistive layer defined in the resistive length direction, wherein, as viewed in the resistance length direction, the first inner contact is shifted from the second inner contact, the first inner contact is at least partly opposed to the second outer contact, and the second inner contact is at least partly opposed to the first outer contact.