Arc Extinguishing Structure for Overcurrent Protection
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Solution Overview
Problem
Existing overcurrent and overvoltage protective devices face issues with arcing effects during breaking capacity tests, leading to potential short circuits and damage to electronic elements due to incomplete disconnection and conductive path formation between electrodes.
Innovation Solution
A protective device with an arc extinguishing structure comprising inorganic particles or polysiloxanes, which are disposed between the electrode layer and the metal structure, and optionally within the substrate, to improve arc extinguishing efficiency and increase insulation impedance, preventing conductive objects from forming conductive paths and reducing arcing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high power is applied during breaking capacity test, then the protective device can be tested for its protective function, but the arcing effect generates very high temperature which melts alloy and flux, inducing more conductive material and decreasing insulation between electrodes
Solution Approach 1:
The patent introduces an arc extinguishing structure as an intermediary element between the electrodes. This structure includes arc extinguishing material (such as ceramic particles, glass beads, or resin) that acts as a mediator to suppress the arcing effect. When an arc occurs during breaking capacity test, the arc extinguishing material absorbs the arc energy, prevents direct contact between electrodes, and reduces the generation of conductive material, thereby maintaining insulation between electrodes while still allowing the protective function to be tested
Solution Approach 2:
The patent converts the harmful arcing effect into a beneficial testing mechanism by controlling the arc to melt the metal structure in a controlled manner. The arc energy is utilized to melt the metal structure and activate the flux, which then flows to fill gaps and create conductive paths intentionally. This controlled process allows the protective device to be tested for its ability to create and maintain conductive paths under arc conditions, while the arc extinguishing structure prevents uncontrolled arcing that would damage the electrodes
2Manufacturing precision
If the arcing effect melts the metal structure, then the flux is activated to flow and fill gaps, but this induces more conductive material and may generate short circuit between electrodes
Solution Approach 1:
The patent applies local quality by positioning the arc extinguishing structure specifically in the gap region between electrodes where arc occurrence is most likely. The arc extinguishing material is concentrated in this critical zone to provide targeted suppression of arcing and conductive material generation. Meanwhile, the flux is allowed to operate in specific areas to fill gaps and create controlled conductive paths, while the arc extinguishing structure prevents excessive conductive material formation that would cause short circuits
3Reliability
If the impedance between electrodes is less than 1 MΩ, then the fuse can't provide protect function, but achieving complete disconnection is difficult due to conductive objects formed during arcing
Solution Approach 1:
The patent applies preliminary action by pre-installing the arc extinguishing structure in the gap region before the breaking capacity test. This structure is prepared in advance to suppress arc formation and prevent the generation of conductive material during the test. By having the arc extinguishing material in place beforehand, the device can achieve more complete disconnection between electrodes, ensuring impedance remains above 1 MΩ and the protective function is maintained
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
The arc extinguishing structure effectively reduces the number of conductive objects and isolates them, preventing electrical conduction and enhancing the insulation impedance between electrodes, thereby improving the protective device's ability to prevent short circuits and ensure reliable operation during high-power tests.
Implementation Method 1
an arc extinguishing structure which is disposed between the outer cover and the substrate
Implementation Method 2
The metal structure is disposed on the electrode layer and located above the gap, and has a melting temperature lower than a melting temperature of the electrode layer
Implementation Method 3
The arc extinguishing structure effectively reduces the number of conductive objects and isolates them, preventing electrical conduction and enhancing the insulation impedance between electrodes
Data Source
AI summary
A protective device includes a substrate, an electrode layer, a metal structure, an outer cover and an arc extinguishing structure. The electrode layer is disposed on the substrate. The electrode layer includes at least one gap. The metal structure is disposed on the electrode layer and located above the gap, and the metal structure has a melting temperature lower than a melting temperature of the electrode layer. The outer cover is disposed on the substrate and covers the metal structure and a portion of the electrode layer. The arc extinguishing structure is disposed between the outer cover and the substrate. A protective module is further provided.