Surface-mounted controlled fuse

Abstract

The invention relates to the technical field of fuses, in particular to a surface-mounted controlled fuse. The fuse comprises a first electrode, a second electrode and fusible alloy; the first electrode is electrically connected with the second electrode through the fusible alloy; the fuse further comprises a ceramic heating piece; the first electrode and the second electrode are attached to the surface of the ceramic heating piece respectively; a heating electrode is arranged on the ceramic heating piece and is in contact with the fusible alloy; and a main circuit formed by the first electrode, the second electrode and the fusible alloy is tightly attached to the ceramic heating piece, so that a heat transfer path is short, and heat transfer is faster and more effective; the ceramic heating piece comprises an upper ceramic sheet and a lower ceramic sheet; a heating resistor is arranged between the upper ceramic sheet and the lower ceramic sheet; since ceramic has good heat conduction capability and high thermal shock resistance, and the upper ceramic sheet, the heating resistor and the lower ceramic sheet form a sandwich layer structure, so that the phenomenon that the first electrode, the second electrode and the heating resistor which are attached to the surface of the ceramic heating piece are broken down again after a current path is broken off at high temperature can be avoided.

Description

technical field [0001] The invention relates to the technical field of fuses, in particular to a patch type controlled fuse. Background technique [0002] China is the world's largest electric two-wheeler market, with a market share of about 90%. Unlike Europe and the United States, electric two-wheelers in China are mainly used for transportation, and under the guidance of policies, they have become the main means of transportation for short and medium distances. With China's urbanization The process of the rate developed rapidly before 2013, and is currently in the stock replacement stage. The national inventory before 2019 is about 300 million vehicles, and the annual output is locked at a maximum of 36.95 million vehicles. [0003] The power battery is used on the electric two-wheeled vehicle, and the IGBT / MOS is used as the control unit to conduct the on / off of the charging and discharging circuit, but the IGBT / MOS has the risk of breakdown and short circuit. Once the c...

AI Technical Summary

Problems solved by technology

However, the IGBT / MOS control unit in the power battery needs sufficient voltage resistance, and the voltage resistance between the two poles and between the two poles and the heating element needs to be improved; currently, the heating sheet in the fuse is generally composed of a ceramic sheet and a heating resistor. The structure can be divided into the following two structures: one is to set the heating resistor on the upper surface of the ceramic sheet, which makes the insulation of the heating sheet poor, resulting in slow heat transfer efficiency; the other is to install the heating resistor on the ceramic sheet The lower surface of the heating sheet will be separated from the circuit board when soldering, resulting in poor contact between the heating sheet and the circuit board, thereby affecting the heat transfer efficiency

Images