Over-temperature and over-current double protection element and manufacturing method thereof

A dual-protection, overcurrent technology, applied in the protection, electrical components, emergency protection circuit devices that respond to overcurrent, etc., can solve the problems of control IC failure, power consumption, long PTC component action time, etc., to achieve accelerated cut-off time, provide overcurrent protection, make up for the effect of slow action time

Inactive Publication Date: 2011-04-27
ICP TECH
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  • Abstract
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  • Claims
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Problems solved by technology

However, PTC components not only act for a long time, but are also helpless against instantaneous overcurrent problems
[0004] Furthermore, part of the detection elements can also be operated together with the control IC to improve the reaction speed and sensitivity, but this kind of safety effect is not only accompanied by a sharp increase in cost, especially compared to the above solution

Method used

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  • Over-temperature and over-current double protection element and manufacturing method thereof
  • Over-temperature and over-current double protection element and manufacturing method thereof
  • Over-temperature and over-current double protection element and manufacturing method thereof

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Embodiment Construction

[0029] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with accompanying drawings.

[0030] The double protection element of the first preferred embodiment of the present invention is to choose to adopt such as figure 1 The shown ceramic substrate 10 has no electrical or thermal conductivity because its material is not a good conductor of electricity or heat. In this example, a plurality of units are distributed in an array on the ceramic substrate 10 , and each unit is illustrated as a rectangular substrate unit body 11 , the short side direction is defined as the row direction, and the long side direction is defined as the column direction. And for the sake of simplicity, only the structure of a single unit is shown in the following diagrams illustrating the flow.

[0031] The manufacturing process of the first preferred embodiment of the p...

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Abstract

The invention discloses an over-temperature and over-current double protection element and a manufacturing method thereof. A fuse and a positive temperature coefficient thermistor are arranged in parallel in a single protection element, so the fuse is firstly fused when current is overlarge to ensure that all currents flow by the thermistor to force the current to be increased so as to rise temperature until the current flowing by the element is completely cut off. When an environment temperature is relatively over-high, the thermistor is firstly heated to increase the resistance to force all the currents to flow by the fuse so as to exceed the rated range of the current, and the current flows back to the thermistor again to cause complete open-circuit effect after the fuse is burnt out. Therefore, the double protection effect can be achieved at a low unit price by means of a single passive element; meanwhile, the space consumption is reduced to increase the market competitiveness and the market acceptance.

Description

【Technical field】 [0001] The invention relates to an element for overcurrent protection, in particular to an overtemperature and overcurrent double protection element and its manufacturing method. 【Background technique】 [0002] In general circuit design, in order to avoid danger or damage to electronic products during use, circuit protection components such as fuses are added to the circuit. Among various circuit protection components, fuses are generally used as overcurrent protection components. Taking a fuse rated at 1 ampere as an example, when the current of 1 ampere is fixed, the life of the fuse can be maintained for at least several hours; but when the current is doubled to If the current is doubled to 4 amperes, the fuse must be blown within a few milliseconds to block the current to avoid serious consequences caused by excessive current. [0003] On the other hand, the amount of current is not the only consideration for the safety of electronic products. For exam...

Claims

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Application Information

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IPC IPC(8): H02H5/04H02H3/08
Inventor 余长欣吴怡萱
Owner ICP TECH
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