Surge suppression negative temperature thermistor resistant to multiple energy shocks

Abstract

The invention relates to a surge-suppressing negative temperature thermistor resistant to multiple energy impacts, comprising a body element sintered from a ceramic body and pins arranged at the lower end of the body element, the pins and the inside of the body element The provided electrode layers are connected, and the electrode layer contains 13% to 18% of glass powder, and the depth of the glass powder fired into the ceramic body of the body element is 120 μm to 130 μm, and the surface of the ceramic body of the body element also contains size It is a crystal grain of 20 μm to 30 μm. The adoption of the present invention deepens the adhesion between the electrode and the ceramic body of the body element, and finally ensures that it still has a considerable level of adhesion tension under long-term high temperature conditions, thereby improving its durability and stability against instantaneous energy impact.

Description

technical field [0001] The invention relates to a surge suppressing negative temperature coefficient thermistor, in particular to a negative temperature coefficient thermistor capable of continuously resisting instantaneous energy impact of a circuit for many times. Background technique [0002] The surge suppression negative temperature thermistor mainly plays the role of instantaneously suppressing the surge current in the circuit and protecting other components from being damaged by the current shock. After instantaneously suppressing the surge current, the product will be directly connected to the circuit for a long time, but the charging and discharging energy at the moment of switching on the circuit also acts on both ends of the NTC element. [0003] At present, conventional surge suppression negative temperature thermistors can withstand 1000 to 3000 energy shocks at the instant of switching circuits. After continuous shocks, the ceramic body of the product heats up ...

AI Technical Summary

Problems solved by technology

[0003] At present, conventional surge suppression negative temperature thermistors can withstand continuous energy shocks for about 1000 to 3000 times at the instant of switching circuits. After continuous shocks, the ceramic body of the product heats up rapidly, resulting in a smaller resistance value of the product.

At this time, the voltage loaded on the circuit remains constant. As the resistance of the product itself decreases, the power loaded on the NTC product also increases at this time, and the continuous energy impact passes through the electrodes at both ends of the ceramic body and quickly penetrates the body. The process causes the two ends of the electrode to be in a high heat state for a long time. After actual measurement, it is found that the temperature of the electrode point is as high as 230 degrees after continuous energy impact of different grades of products. The electrodes are forcibly peeled off due to unequal thermal stress

As a result, the loosening of the electrode and the ceramic body can easily cause an arc phenomenon, causing the product to form a large contact resistance and burst

This kind of defect not only makes the whole product unable to be used continuously for many times, but also has the potential hazard of blowing up the machine during use. Therefore, the wide application of this type of product is greatly reduced.

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