57 views Yuda Electronic (HK) Technology Co.,Limited. 2019-08-19
The type of overheat protection for the power adapter can be divided into the following categories: auto-reset, manual reset, non-renewable, non-reset, and other types that provide equivalent thermal protection.
The heat source of the power adapter is mainly Schottky rectifier diode, high frequency switching transformer, power MOS tube, filtered electrolytic capacitor, wherein the temperature rise of the power MOS tube, the high frequency transformer and the rectified Schottky diode is prominent.
In order to prevent damage to the power adapter due to overheating, designing the power adapter requires not only the use of electronic components with high temperature characteristics. At the same time, it is required to print PCB boards, heat sinks, high-frequency transformers and other devices. And need to take overheat protection measures, these are the conditions necessary to ensure safety.
In order to suppress the temperature rise of the power adapter, in addition to the power MOS tube with small current and short storage time, it is necessary to add a heat sink to the power MOS tube. After the MOS tube is equipped with a heat sink, the stability of the power adapter will be greatly improved, and the loss rate will be significantly reduced. The function of the electronic switch overheat protection is to cut off the AC input line of the power adapter or forcibly turn off the modulation pulse output and stop the high frequency oscillation before the temperature of the component or the power supply case in the power adapter exceeds the specified limit.
The temperature resistance and fire performance of the power adapter are not only directly related to the reliability and service life of the power adapter, but also directly related to the risk of fire, which is related to the safety of the user’s life and property.
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