It is worth learning about the overheating protection of the power adapter, you know?

“With the rapid development of society, our power adapters are also developing rapidly, so do you know the detailed data analysis of power adapters? Next, let Xiaobian lead you to understand the relevant knowledge in detail.

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With the rapid development of society, our power adapters are also developing rapidly, so do you know the detailed data analysis of power adapters? Next, let Xiaobian lead you to understand the relevant knowledge in detail.

No matter what kind of Electronic equipment, the running time will increase the temperature. When the temperature is too high, it will inevitably affect the function of the equipment. The same is true for the power adapter. When the temperature is too high, the function of its internal components will be affected. , resulting in unstable factors. Therefore, the usual power adapters have overheating protection.

Power adapters are not unfamiliar in our lives. These electronic products such as TVs, computers, and mobile phones at home are inseparable from power adapters. I believe many people have noticed that when the power adapter is sometimes in use, the power adapter will feel overheated or even very hot.

The main heat sources of the power adapter are Schottky rectifier diodes, high-frequency switching transformers, power MOS transistors and filter electrolytic capacitors. The temperature rise of power MOS transistors, high frequency transformers and rectifier Schottky diodes is more prominent. In order to prevent the power adapter from being damaged due to overheating, the design of the power adapter not only requires the use of electronic components with good high temperature characteristics, but also requires reasonable design and advanced printed PCB boards, heat sinks and high-frequency production processes. Transformer, and take overheating protection measures, which is necessary to ensure safety. Overheat protection type power adapters can be divided into the following categories: automatic reset type, manual reset type, non-renewable type, non-reset type and other types that can provide equivalent thermal protection.

Power adapters are not unfamiliar in our lives. These electronic products such as TVs, computers, and mobile phones at home are inseparable from power adapters. I believe many people have noticed that when the power adapter is sometimes in use, the power adapter will feel overheated or even very hot.

Overheating protection means that the corresponding protection function is activated when the temperature exceeds a certain threshold. During the operation of electronic equipment or machinery, heat is generated due to energy conversion or friction, which may cause abnormal operation or failure. There are three methods for overheating protection, cutting off the operation of the equipment, reducing the operating performance of the equipment, or improving the ventilation and heat dissipation conditions. Overheating protection against power supply being a single entity is a cause for concern. May be difficult to remove from heat source. The most basic requirements for placement are to be free from mechanical shock, easy to disassemble, polarity protection function, cables, connection terminals of non-polarity devices must have two cable overheat protection procedures, the protection circuit is disconnected and will not affect the normal operation of the network adapter, However, it cannot cause fire or damage electrical equipment. Shenzhen Senshuqiang Power Adapter Manufacturer believes that under normal circumstances, the AC adapter circuit board space and cabinet space are relatively small, and it has some problems and overheating protection. If overheating protection is difficult to assemble, 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 forcibly turn off the modulation pulse output to stop the high frequency oscillation.

A narrower piece of plastic or metal can be placed between the adapter and the desktop to speed up heat dissipation from the adapter.

In order to suppress the temperature rise of the power adapter, in addition to selecting a power MOS tube with small leakage current and short storage time, it is also 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 overheating protection measures is to cut off the AC input line of the power adapter, or forcibly turn off the modulated pulse output before the temperature of the components or the power supply casing that are prone to heat in the power adapter exceeds the specified limit value, or stop the high-frequency oscillation.

In a high temperature environment, put the adapter on its side to reduce the contact with the ground area, so that the adapter can better dissipate heat and have a cooling effect.

If the power adapter has an IC-controlled driver overheating protection, there is no need to add any external components or only a few 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. The driver IC thermal shutdown circuit and thermal protection are made very simple. The cost of the integrated circuit itself is very low, and the cost performance is very high.

The above is a detailed analysis of the relevant knowledge of power adapters. It is necessary for everyone to continuously accumulate experience in practice, so as to design better products and develop better for our society.