Surface-adhered fuse with bi-circuit construction and its production

Abstract

The surface mount fuse of the present invention is provided with a fuse circuit structure and a thermistor circuit structure on an insulating substrate; wherein, the fuse circuit structure is mainly composed of a fusible link, and the thermistor circuit structure There are two internal electrodes at one end of a polymer positive temperature coefficient (PPTC) material in contact with the insulating substrate, and two external electrodes at the other end, and two conductors are arranged on the insulating substrate The connection between the two internal electrodes and the fusible link constitutes a surface-mounted fuse structure that can withstand high voltage and high current by connecting the fuse circuit structure and the thermistor circuit structure in parallel.

Description

technical field [0001] The present invention relates to a surface-mounted fuse, especially a surface-mounted fuse structure that is capable of withstanding high voltage and high current by connecting a fuse circuit structure and a thermistor circuit structure in parallel. Background technique [0002] Press, the general electrical device will set the maximum use current. When the current used exceeds, the device may be damaged or burned. The main function of the fuse is to prevent the excess current from passing through the electronic circuit, and the excess current flows through the fuse. It will cause it to generate high temperature and cause fusing to protect the circuit from damage. In the existing electrical devices such as information, communication, and consumer electronics products, mainly use printed circuit boards (Printed Circuit Board, PCB). The components are connected together to make them function as a whole. As electrical devices become more and more complex,...

AI Technical Summary

Problems solved by technology

[0005] In other words, electrical circuits using surface-mount fuses cannot function normally after the fusible link is melted and broken, but in fact many electrical circuits are in high-voltage and high-current operating conditions for a long time. The temperature rises due to the resistance of the resistor. This unexpected temperature rise reaction will accelerate the fusing of the fusible link, rather than the excessive current causing the fusing of the fusible link, resulting in the failure of the entire electrical device to operate normally.

[0006] As a result, there is another such as figure 1 Shown is a surface mount fuse combined with a thermistor circuit structure. This surface mount fuse is provided with a fuse circuit structure 20 composed of a fusible link 21 on the surface insulation layer 10a of an insulating substrate 10, and then A top insulating layer 10b is covered on the fusible link 21, and a polymer positive temperature coefficient material 31 is provided inside the insulating substrate 10, and two Corresponding external electrodes 41, one of the external electrodes 41 is connected with the fusible link 21, and tin points 50 are provided to form a series circuit structure between the polymer positive temperature coefficient material 31 and the fusible link 21, and then become a A surface-mounted fuse structure with a thermistor circuit structure; however, with such a structural design, when the overcurrent factor causes the fusible link 21 to melt and break, even after the overcurrent factor disappears, the entire electrical circuit is permanently disconnected. won't work properly

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