Chip Resistor Heat Transfer Layout for Short-Time Overload
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Solution Overview
Problem
The existing chip resistor designs suffer from insufficient short-time overload (STOL) characteristics due to excessive temperature rise in the central portion, primarily because they are fully covered with an insulating protective film which hinders effective heat dissipation.
Innovation Solution
The chip resistor incorporates a design with an insulating substrate, first and second electrodes, a resistor, and separate heat transfer layers with higher thermal conductivity than the insulating protective layer, along with an insulating protective layer to electrically isolate the electrodes and heat transfer layers, allowing for efficient heat dissipation from the central portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire resistor is covered with an insulating protective film, then electrical insulation is improved, but heat dissipation deteriorates causing excessive temperature rise in the central portion
Solution Approach 1:
The insulating protective film is segmented into a first insulating protective film covering the first electrode and a second insulating protective film covering the second electrode, with the central portion of the resistor left exposed. This segmentation allows different regions to have different functions: electrical insulation at the electrodes and heat dissipation at the central portion.
Solution Approach 2:
Different regions of the resistor are given different protective characteristics. The electrode regions receive full insulating coverage for electrical safety, while the central portion remains exposed to facilitate heat dissipation. This local differentiation resolves the contradiction between insulation and heat dissipation.
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 effectively prevents temperature rise in the central portion during use, thereby enhancing the short-time overload characteristics of the chip resistor by facilitating quick heat dissipation to the outside, ensuring reliable operation.
Implementation Method 1
The first heat transfer layer has a thermal conductivity greater than that of the insulating protective layer, and is in contact with the resistor and the first front electrode. The second heat transfer layer is separated from the first heat transfer layer. The second heat transfer layer has a thermal conductivity greater than that of the insulating protective layer, and is in contact with the resistor and the second front electrode.
Data Source
AI summary
A chip resistor includes an insulating substrate, a first electrode, a second electrode, a resistor, a first heat transfer layer, a second heat transfer layer, and an insulating protective layer. The first heat transfer layer has a thermal conductivity greater than that of the insulating protective layer, and is in contact with the resistor and a first front electrode. The second heat transfer layer is separated from the first heat transfer layer. The second heat transfer layer has a thermal conductivity greater than that of the insulating protective layer, and is in contact with the resistor and a second front electrode.