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Protection element and its circuit protection device

A technology for protecting components and electrodes, which is applied in the direction of emergency protection devices, circuits, electrical components, etc., can solve problems such as cracks, small cross-sectional area of ​​connecting circuits, and unsuitability for large currents, and achieve the effect of improving reliability and power

Active Publication Date: 2021-07-30
POLYTRONICS TECH
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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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  • Protection element and its circuit protection device
  • Protection element and its circuit protection device
  • Protection element and its circuit protection device

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Embodiment Construction

[0059] In order to make the above and other technical content, 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 h...

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Abstract

The invention provides a protection element and a circuit protection device thereof. The protection element includes a first planar substrate, a second planar substrate, a heating element and a fuse element. The second planar substrate is attached to the lower surface of the first planar substrate to form a composite structure. The heating element includes an insulating plate and a heat generating layer formed on the surface of the insulating plate. The heating element is arranged on the first planar substrate, and the insulating plate is arranged between the first planar substrate and the heating layer. The fuse element is arranged above the heating element. When overvoltage or overtemperature occurs, the heating element generates heat to melt the fuse 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 Patents(China)
IPC IPC(8): H01H85/05
Inventor 苏聪敏蔡东成王绍裘
Owner POLYTRONICS TECH
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