The Application of Lute Technology's Self Recovery Fuse for Overflow Temperature Protection on Intelligent Wearable Devices.ceramic chip fuse

　　In recent years, with the rapid progress of science and technology, the market of intelligent wearable devices has become more and more popular. At present, intelligent wearable devices such as smart bracelets, smart watches, Smartglasses, health wear, ear wear devices and somatosensory control are increasingly popular in the market. Intelligent wearable devices can bring convenience and guarantee to people's lives through software support, data interaction, cloud interaction and other ways. Intelligent wearable devices require direct contact with the user's body, so the safety and stability of the product are crucial. Below, we will provide a detailed introduction to the potential safety hazards and solutions of intelligent wearable devices.

　　The safety hazards of intelligent wearable devices include the following three points:

　　1. PMIC (Integrated Power Management Circuit) failure

　　The product designer will add some overcurrent protection components to the charging port to cope with static electricity or surge current damage. Although these protective components can handle almost all problems in practical use, there may still be situations where the capacity of the protective components is exceeded, resulting in PMIC failure. In wearable devices, PMIC not only manages the power supply, but also manages the process of battery charging through the power control chip. If the PMIC fails, it will lead to uncontrolled charging process and the risk of overcharging the battery.

　　2. Resistance performance failure of subsequent components

　　The failure of semiconductor components at the rear end of the board is similar to that of PMIC, and there may be a failure of resistance performance. After the failure occurs, the failed component will form a conductive circuit with the battery, and the resistance will continue to rise under the fault current, causing high temperature heating. In severe cases, it can also burn the skin. As shown in the figure below, the resistance performance of the semiconductor fails (20 Ω). At a current of 0.2A, the surface temperature of the component will exceed 90 ℃.

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