Reasons for Severe Heating of Linear Adapters

　　Severe heating in linear adapters can be attributed to multiple factors. One of the main culprits is excessive load current. When the device connected to the adapter draws more current than the adapter is rated for, the internal components have to work harder to supply the required power. The power transistor, which is responsible for regulating the output current, dissipates a significant amount of power as heat under such circumstances. Continuously operating the adapter with an overloaded condition can lead to a rapid increase in temperature, potentially causing damage to the components and reducing the adapter's lifespan.

　　Internal component failures can also cause overheating. For example, a short - circuited component, such as a diode or a capacitor, can disrupt the normal current flow and cause excessive current to pass through other components. This increased current flow results in higher power dissipation and more heat generation. A short - circuited diode in the rectifier bridge, for instance, can cause the remaining diodes to carry more current than normal, leading to overheating of the entire rectifier section.

　　In addition, poor design or manufacturing defects can contribute to severe heating. If the adapter's internal layout does not allow for proper air circulation, heat gets trapped inside. Insufficient insulation between components can also lead to electrical leakage, which in turn generates heat. Moreover, using low - quality components with poor thermal conductivity or high internal resistance can cause more heat to be produced during operation.

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