Voltage Divider Resistor Structure With Anti-Migration Junction
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Solution Overview
Problem
High voltage resistor structures and voltage divider arrangements face challenges such as excessive electric stresses leading to dielectric failures, and metal migration during manufacturing or operation, which can alter resistance values and impair reliability.
Innovation Solution
The introduction of a junction section with a resistivity smaller than the resistive trace, acting as an intermediate entity between the terminal and the resistive trace, reduces direct metal migration and maintains the integrity of the resistive path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a direct joint between the electrically conductive terminal and the resistive trace is provided, then the manufacturing process is simplified, but metal migration occurs during firing or operation which alters the resistance value and impairs reliability
Solution Approach 1:
The patent introduces a junction section as an intermediary element between the electrically conductive terminal and the resistive trace. This junction section has a specific composition and structure that prevents direct contact between the terminal and resistive trace, thereby blocking metal migration while maintaining electrical connectivity. The junction section acts as a buffer zone that resolves the contradiction by enabling both direct joining (ease of manufacture) and preventing harmful metal diffusion (reliability).
2Reliability
If the junction section has a smaller resistivity than the resistive trace, then metal migration from the terminal is reduced, but the junction section becomes a more significant electrical path
Solution Approach 1:
The junction section is designed with local quality - it has a specific composition and resistivity that differs from both the terminal and the resistive trace. By making the junction section resistivity smaller than the resistive trace but larger than the terminal resistivity, the patent creates a gradient structure that optimally balances metal migration prevention with electrical performance. This local differentiation resolves the contradiction by providing targeted protection where needed while maintaining overall system simplicity.
3Reliability
If a junction section is introduced between the terminal and resistive trace, then metal migration is prevented, but the device structure becomes more complex
Solution Approach 1:
The patent segments the electrical connection path into distinct functional zones: the terminal, the junction section, and the resistive trace. This segmentation allows each component to be optimized for its specific function - the terminal for electrical connection, the junction section for migration prevention, and the resistive trace for resistance function. By dividing the structure into these manageable segments, the patent achieves reliable metal migration protection while keeping each individual component relatively simple in design.
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 enhances the reliability and accuracy of resistor structures by minimizing undesired changes in resistance due to metal migration, while also supporting efficient manufacturing processes and improved voltage withstand capabilities.
Implementation Method 1
metal migration/diffusion from the electrically conductive terminal into the resistive trace may occur during firing during manufacture or during operation of the resistor structure at high voltage
Data Source
Figure 1(a)~1(c)
Figure 2
Figure 3(a)~3(b)
AI summary
The invention relates to a resistor structure comprising at least an electrically insulating substrate, at least one electrically conductive terminal directly or indirectly provided on the substrate and having a terminal resistivity, at least one resistive trace forming part of a resistive path, the resistive trace directly or indirectly and at least partially provided on the substrate and joined to the terminal and having a trace resistivity, characterized in that at least a portion of the terminal and a portion of the resistive trace are indirectly joined via a junction section having a junction resistivity, wherein the junction resistivity is smaller than the trace resistivity.