Protective element and circuit protection device thereof

A technology for protection components and circuit protection, applied in the field of protection components, can solve the problems of small cross-sectional area of ​​connecting circuits, inability to conduct heat evenly, and not suitable for large currents, and achieve the effects of improving power, improving reliability, and avoiding cracks

Active Publication Date: 2019-05-07
POLYTRONICS TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, because the heating element 120 directly contacts the planar substrate 110, and the area of ​​the planar substrate 110 is usually much larger than the area of ​​the heating element 120, the heat generated by the heating element 120 may be concentrated in a certain area of ​​the planar substrate 110 due to the inability to conduct uniformly. Cracks
In addition, the cross-sectional area of ​​the connection circuit between the low-melting-point metal layer 140 and the external electrode is usually small, which is not suitable for high current (>70A) applications.

Method used

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  • Protective element and circuit protection device thereof
  • Protective element and circuit protection device thereof
  • Protective element and circuit protection device thereof

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Embodiment Construction

[0059] In order to make the above and other technical contents, features and advantages of the present invention more comprehensible, the following specifically cites relevant embodiments, together with the accompanying drawings, for a detailed description as follows.

[0060] figure 2 A schematic diagram showing the three-dimensional structure of the protection element 20 according to the first embodiment of the present invention, image 3 is a three-dimensional exploded structural schematic diagram of the protection element 20, Figure 4 then figure 2 A schematic cross-sectional structure diagram of the middle protection element 20 along the section line 1-1. Figure 5It is a schematic diagram of a part of the three-dimensional structure of the protective element 20 without the outer cover 31 . The protection element 20 mainly includes a heating element 23 and a fuse element 24 , wherein when an overvoltage or an overtemperature occurs, the heating element 23 generates ...

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Abstract

The invention provides a protective element and a circuit protection device thereof. The protective element comprises a first planar substrate, a second planar substrate, a heating element and a fusible element. The second planar substrate is attached to the lower surface of the first planar substrate to form a composite structure. The heating element comprises an insulating plate and a heating layer formed on the surface of the insulating plate. The heating element is arranged on the first planar substrate. The insulating plate is arranged between the first planar substrate and the heating layer. The fusible element is arranged above the heating element. When overvoltage or over-temperature occurs, the heating element emits heat to melt the fusible element.

Description

technical field [0001] The invention relates to a protection element applied in an electronic device and a circuit protection device including the protection element, and in particular to a protection element with the function of preventing overvoltage, overcurrent or overtemperature and a circuit protection device thereof. Background technique [0002] Protection elements for cutting off overcurrent are known, and current fuses made of low-melting-point metals such as lead, tin, and antimony are widely known. Afterwards, in terms of preventing overcurrent and overvoltage, protection elements were continuously developed, which included sequentially stacking a heat generating layer and a low-melting point metal layer on a flat substrate. When the overvoltage occurs, the heating body generates heat, and the heat is transferred upward from the bottom to heat the electrode carrying the low melting point metal body, thereby fusing the low melting point metal body and cutting off ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H85/05
Inventor 苏聪敏蔡东成王绍裘
Owner POLYTRONICS TECH
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