Positive temperature coefficient device

Abstract

A PTC device comprises a current and temperature sensing element, a first insulating layer, a second insulating layer, a first electrode layer and a second electrode layer. The current and temperaturesensing element is a laminated structure comprising a first electrically conductive layer, a second electrically conductive layer and a PTC material layer. The first and second electrically conductive layers are disposed on first and second surfaces of the PTC material layer. The first and second insulating layers are disposed on the first and second electrically conductive layers. The first electrode layer is disposed on the first insulating layer and electrically connects to the first electrically conductive layer. The second electrode layer is disposed on the second insulating layer and electrically connects to the second electrically conductive layer. The first and second electrode layers serve as solder attach surfaces for soldering the PTC device onto a circuit board.

Description

technical field [0001] The present invention relates to a thermistor, in particular to a positive temperature coefficient (Positive Temperature Coefficient; PTC) element. Background technique [0002] PTC elements can be used to protect circuits from damage due to overheating or excessive current flow. A positive temperature coefficient device usually includes two electrodes and a resistive material between the two electrodes. This resistance material has a positive temperature coefficient characteristic, that is, it has a low resistance value at room temperature, and when the temperature rises to a critical temperature or an excessive current is generated in the circuit, its resistance value can immediately jump hundreds or thousands of times or more , so as to inhibit the passage of excessive current to achieve the purpose of circuit protection; or applied to the over-temperature detection circuit, which can detect the ambient temperature in advance to instruct the back-e...

AI Technical Summary

Problems solved by technology

However, because the electrode surfaces on both sides are not symmetrical and have front and back sides, it is troublesome to distinguish the front and back sides during subsequent electrical testing and packaging, and if the isolation line is produced due to the influence of material expansion and contraction, it will cause deviations between the left and right electrodes. Larger and smaller will affect the electrical characteristics

In addition, the component has no PP structural support, and there may be problems of insufficient strength and easy breakage during the manufacturing process

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