No matter what electronic equipment, running for a long time will make the temperature rise, when the temperature is too high, it can not help but affect the function of the equipment, the power adapter is the same, when the temperature is too high, the function of its internal components will be affected, resulting in instability. That's why power adapters usually have overheating protection.
Power adapters with overheating protection types can be divided into the following categories: automatic reset, manual reset, non-regenerative, non-reset and other types that provide equivalent overheating protection.
Overheating protection, which refers to the activation of the appropriate protection function when the temperature exceeds a certain threshold value. Heat generated by energy conversion or friction in the operation of electronic equipment or machinery can lead to abnormal operation or malfunction. There are three ways to protect against overheating: shutting down equipment operation, reducing equipment performance, or improving ventilation and heat dissipation conditions.
Overheating protection to prevent the power supply from being a single entity is an area of concern. It may be difficult to take away from the heat source. Placement of the most basic requirements are not subject to mechanical shock, easy to disassemble, polarity protection features, cables, no polarity device connection terminals must have two cable overheating protection program, the protection circuit is disconnected, will not affect the normal operation of the network adapter, but can not cause fire or damage to electrical equipment. Under normal circumstances, AC adapter circuit board space and cabinet space is relatively small, it has some problems and overheating protection. If it is difficult to assemble overheating protection, use a thermal fuse or thermistor as thermal protection. Put it on the surface of the cooler, high-frequency transformer or power MOS tube, the overheat protection switch will automatically turn off the power supply when the temperature rises to a certain value, or force off the modulation pulse output to stop high-frequency oscillation.
In order to suppress the temperature rise of the power adapter, in addition to the selection of small leakage current, short storage time of the power MOS tube, but also need to add a heat sink to the power MOS tube. MOS tube with a heat sink, the stability of the power adapter will be greatly improved, the loss rate is significantly reduced. The role of electronic switch overheating protection measures is in the power adapter is prone to heat components or power supply shell temperature exceeds the specified limit value before, cut off the power adapter AC input line, or forced to turn off the modulation pulse output, stop high-frequency oscillation.
If the power adapter is equipped with an IC control driver overheat protection function, there is no need to add any external components or only a small number of external components to prevent overheating. Since the power adapter controls the driver IC, a PN junction temperature sensor is built in, including a thermal shutdown circuit. The PN junction temperature sensor has a built-in driver IC connected to the sensor, and the driver IC thermal shutdown circuit and overheating protection become very simple. The cost of the IC itself is very low and the cost performance is very high.
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