Surface Mount Thermistor Element

Abstract

The invention discloses a surface tack thermistor element, which comprises a resistor element, a first electrode, a second electrode and at least a thermally conductive insulating layer. The resistor element comprises a first conductive member, a second conductive member and high-molecular material layers, wherein the high-molecular material layers are laminated between the first conductive member and the second conductive member and have characteristics of positive temperature coefficient or negative temperature coefficient. The high-molecular material layers and the first and second conductive members extend together along a first direction to form a laminated structure. The first electrode is electrically connected with the first conductive member. The second electrode is electrically connected with the second conductive member and is electrically isolated from the first electrode. Heat conductivity of the first and second electrodes is at least 50W / mK. The thermally conductive insulating layer contains a high-molecular insulated substrate and a thermally conductive filling material and is arranged between the first electrode and the second electrode. Heat conductivity of the thermally conductive insulating layer is within 1.2W / mK-13W / mK.

Description

technical field [0001] The present invention relates to thermistor technology, and in particular to a surface mount type (SMD) variable thermistor element made of conductive polymer material, such as a positive temperature coefficient (PTC) element, a negative temperature coefficient (NTC) element , to provide over-current protection and sensing of abnormal temperature environment. Background technique [0002] Since the resistance of the conductive composite material with a positive temperature coefficient (Positive Temperature Coefficient; PTC) or a negative temperature coefficient (Negative Temperature Coefficient; NTC) is sensitive to temperature changes, it can be used as a material for a current sensing element. Taking PTC as an example, since the resistance of PTC conductive composite materials can maintain an extremely low value at normal temperature, the circuit or battery can operate normally. However, when an over-current or over-temperature phenomenon occurs in ...

AI Technical Summary

Problems solved by technology

However, when components are used in high-temperature environments such as LED lighting, due to factors such as component size limitations and poor heat transfer, the hold current of the product cannot be increased.

In addition, if the thermal insulation of the component is too high, it may also cause the problem of too low sensitivity to ambient temperature

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