Overheating of the power adapter may cause it to burn out.

　　From the perspective of internal circuits, when a power adapter overheats, its internal electronic components will be subjected to enormous pressure. For example, at high temperatures, the reverse leakage current of rectifier diodes will increase, which not only increases power consumption and generates more heat, but may also lead to diode breakdown. In addition, in an overheated environment, the insulation paint of the windings of transformers may age and fail, causing short circuits between windings and ultimately damaging the entire transformer.

　　From the perspective of material heat resistance, some materials inside the power adapter have their own heat resistance limits. PCB (printed circuit board) may experience carbonization, delamination, and other phenomena at excessively high temperatures, leading to interrupted circuit connections. However, some plastic casings may soften, deform, or even melt under prolonged high temperatures, which not only affects the appearance of the power adapter but may also expose internal components, increasing the risk of damage.

　　From the working principle of a power adapter, overheating may affect its power conversion efficiency. When the temperature is too high, the output voltage and current of the power adapter may become unstable, which may further exacerbate the heating of internal components, forming a vicious cycle and ultimately causing the power adapter to burn out.

　　However, modern power adapters are usually designed with certain overheating protection mechanisms. When the temperature exceeds a certain threshold, the protection mechanism will automatically activate, such as cutting off the power output or reducing the output power, to avoid irreversible damage to the adapter caused by continued temperature rise. However, if the overheat protection mechanism fails or does not take effect in a timely manner, the power adapter is likely to be burned out.

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