Voltage Divider Resistor Structure With Junction Section Stability
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Solution Overview
Problem
High voltage resistor structures and voltage divider arrangements face challenges in manufacturing, reliability, and safety due to excessive electric stresses, leading to potential dielectric failures such as partial discharge or electrical breakdown.
Innovation Solution
The introduction of a junction section with a resistivity smaller than the resistive trace, which acts as an intermediate entity between the electrically conductive terminal and the resistive trace, reduces direct metal migration and alters the electrical characteristics of the resistive path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a direct joint between the terminal and the resistive trace is used, then the manufacturing process is simpler, but metal migration occurs during firing or operation which alters the electrical resistance and degrades reliability
Solution Approach 1:
A junction section is introduced as an intermediary element between the terminal and the resistive trace. This junction section has a specific resistivity range (10^-6 to 10^-2 Ωm) that is higher than the terminal resistivity but lower than or equal to the resistive trace resistivity. The junction section acts as a buffer zone that prevents direct metal migration from the terminal into the resistive trace, thereby maintaining the electrical characteristics of the resistive path while still allowing for a relatively simple manufacturing process.
2Reliability
If the junction section resistivity is made smaller than the resistive trace resistivity, then metal migration is reduced and reliability is improved, but the device complexity increases due to the additional junction section
Solution Approach 1:
The connection path between the terminal and the resistive trace is segmented into two distinct sections: the junction section and the resistive trace section. The junction section is specifically designed with controlled dimensions and resistivity to serve as a transition zone. This segmentation allows the electrical and physical properties to be optimized independently for each section, preventing metal migration while maintaining overall structural efficiency.
Solution Approach 2:
Different sections of the resistive structure are assigned different local properties. The junction section has a specific resistivity range (10^-6 to 10^-2 Ωm) that differs from both the terminal and the resistive trace. This local quality differentiation creates an optimal gradient for current flow and metal ion migration resistance, improving reliability without requiring complete redesign of the entire structure.
3Manufacturing precision
If multiple separate firing processes are used for terminal, junction section, and resistive trace, then manufacturing precision is improved, but productivity decreases and manufacturing costs increase
Solution Approach 1:
The terminal, junction section, and resistive trace are designed to be co-fired in a single firing process. The junction section's material composition and geometric dimensions are specifically optimized to allow all three components to reach their respective optimal firing temperatures simultaneously in one cycle. This merging of processes maintains manufacturing precision while significantly improving productivity and reducing costs compared to separate firing operations.
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 configuration reduces undesired changes in the electrical resistance of the resistive path, enhances the reliability and accuracy of the resistor structure, and supports efficient manufacturing by allowing co-firing of various entities, thereby improving safety and reducing costs.
Implementation Method 1
In case of a direct joint between the electrically conductive terminal and the resistive trace, 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.
Implementation Method 2
at least one resistive trace forming part of a resistive path, wherein the resistive trace is (optionally in parts) directly or indirectly provided on the substrate and joined to the terminal and has a trace resistivity
Data Source
AI summary
A resistor structure includes 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.