Sacrificial Fuse with Low-Melting Auxiliary Medium
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Solution Overview
Problem
Existing protective devices for electronic devices fail to effectively prevent over-current and over-voltage, as they rely on temperature fuses that can lead to short-circuiting due to the melting of metal elements, which do not adequately manage the flow of melted material.
Innovation Solution
A protective device with a sacrificial metal element and an auxiliary medium with a lower melting point, where the auxiliary medium is positioned between the metal element and the substrate, facilitating its melting and flow away from electrodes, and a heat-generating element to control the melting process, ensuring effective over-voltage and over-current protection by preventing short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature fuse is serially connected with a battery circuit and a heater is used to melt the temperature fuse for over-voltage protection, then over-voltage protection is achieved, but the melted metal element may cause short-circuiting between electrodes
Solution Approach 1:
The patent introduces an auxiliary medium with lower melting point than the temperature fuse as an intermediary substance between the melted metal element and the electrodes. This auxiliary medium receives the melted metal element first, preventing direct contact between the metal element and electrodes, thereby eliminating the short-circuiting hazard while maintaining the over-voltage protection function
Solution Approach 2:
The patent converts the harmful effect of melted metal element (potential short-circuiting) into a beneficial protective mechanism by directing the melted metal element to flow into the auxiliary medium. The auxiliary medium, with its lower melting point, safely contains the melted metal element, transforming a potential failure mode into a reliable protection mechanism
2Reliability
If the metal element melts to disconnect the battery circuit for protection, then over-current protection is achieved, but the melted metal element may bridge electrodes causing short-circuiting
Solution Approach 1:
The auxiliary medium serves as a mediator that intercepts the melted metal element during over-current events. By positioning the auxiliary medium between the metal element and the electrodes, the patent ensures that melted metal flows into the auxiliary medium rather than bridging the electrodes, thus maintaining circuit disconnection for protection while preventing short-circuits
Solution Approach 2:
The patent applies local quality by creating a specific zone (the auxiliary medium) with different properties (lower melting point) at the critical location where melted metal element interacts with the electrodes. This localized modification ensures that only in this specific region does the auxiliary medium receive the melted metal element, preventing short-circuiting at the electrode interface
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 solution effectively melts and directs the metal element away from electrodes, preventing short-circuiting and ensuring reliable over-voltage and over-current protection by enhancing the melting and flow of the metal element, thus providing stable protection for electronic circuits.
Implementation Method 1
the first auxiliary medium having a melting point lower than that of the metal element, and wherein the first auxiliary medium facilitates breaking of the metal element upon melting
Implementation Method 2
The protective device may be provided with a heat-generating element supported by the substrate, providing heat to at least the auxiliary medium
Data Source
AI summary
A protective device including a substrate, a conductive section and a first auxiliary medium is provided. The conductive section is supported by the substrate, wherein the conductive section comprises a metal element electrically connected between first and second electrodes. The metal element serves as a sacrificial structure having a melting point lower than that of the first and second electrodes. The first auxiliary medium is disposed between the metal element and the substrate, wherein the first auxiliary medium has a melting point lower than that of the metal element. The first auxiliary medium facilitates breaking of the metal element upon melting.