High voltage resistant over-current protective element

Abstract

The invention discloses an overcurrent protection component standing high voltage. The overcurrent protection component standing high voltage includes a conducting and radiating layer of a positive temperature coefficient (PTC) and two metal electrodes. The conducting and radiating layer of a PTC consists at least of a high molecular polymer, a conductive filler and a thermal conducting filler. With the high thermal conducting efficiency for the thermal conducting filler (with a thermal conductivity larger than 1W / mK), the overcurrent protection component standing high voltage has the characteristic of high thermal conductivity; besides, the voltage borne by the component can be evenly distributed on the conducting and radiating layer of a PTC, thus increasing the characteristic of standing high voltage.

Description

technical field [0001] The invention relates to a high-voltage overcurrent protection element, in particular to a high-voltage overcurrent protection element with a positive temperature coefficient (Positive Temperature Coefficient; PTC) characteristic. Background technique [0002] The resistance value of conventional PTC elements responds quite sensitively to temperature changes. When the PTC element is in normal use, its resistance can maintain a very low value so that the circuit can operate normally. However, when the temperature rises to a critical temperature due to an over-current or over-temperature phenomenon, its resistance value will instantly jump to a high resistance state (for example, 10 4 ohms) and reverse the excess current to achieve the purpose of protecting the battery or circuit components. Since PTC elements can effectively protect electronic products, the PTC elements have been integrated into various circuit elements to prevent overcurrent damage. ...

AI Technical Summary

Problems solved by technology

However, the use of polymers irradiated by radiation is often accompanied by degradation, the original polymer is cracked into small molecules, and the original physical and electrical properties are lost

And the use of radiation irradiation often causes uneven irradiation of the PTC material layer, resulting in deterioration of withstand voltage characteristics

In addition, if cobalt 60 gamma rays are used to irradiate, it must take a considerable amount of time because of its low energy, which reduces the yield throughput)

If electron beam (E-beam) is used for irradiation, high heat will often be generated, resulting in internal stress, and its manufacturing process is not easy to control, which affects product quality, and its production cost is relatively high

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