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Heat dissipation method of high frequency switching power supply

elecfans | 22/03/2021
 

The high-frequency power supply, also known as the electronic tube frequency conversion device, is the key equipment of the high-frequency induction furnace. High-frequency power supply and induction heating technology can heat metal materials with high efficiency, high speed, low power consumption and environmental protection. At present, the methods to dissipate heat to the high-frequency switching power supply mainly include fan cooling, natural cooling and a combination of the two. How to quickly heat the high-frequency switching power supply at high temperatures?

1. Fan heat dissipation. After using a fan for heat dissipation, the volume and weight of the high-frequency switching power supply can be greatly increased, and the cost of raw materials can be greatly reduced.

2. Natural heat dissipation. This method is the first traditional cooling method for high-frequency switching power supplies. This method mainly relies on a large metal radiator for direct heat dissipation. Heat transfer Q = KA△t (K heat transfer coefficient, A heat transfer area, △t temperature difference). As the output power of the rectifier increases, the temperature of its power components also increases, and the temperature difference is also increased. Therefore, if the heat exchange area of ​​the rectifier A is large enough, its heat dissipation will not be offset, and the temperature difference of the power components is small. Low thermal shock. However, the main disadvantage of this method is the large size and weight of the radiator. The design of the transformer winding can minimize the temperature rise to avoid the temperature rise affecting its performance. Therefore, the choice of materials is very wide, and the volume and weight of the transformer are also very important. The cost of the rectifier material is high, and maintenance and replacement are inconvenient.

3. Combine fan and natural heat dissipation. Due to changes in ambient temperature and load, heat will be dissipated, and the combination of fans and natural cooling methods can dissipate heat faster. This method can reduce the area of ​​the cooler while increasing the heat dissipation of the fan, so that the power components work in a relatively stable temperature field, and the service life is not affected by changes in external conditions. This not only overcomes the shortcomings of fan cooling with delayed heat dissipation adjustment of power components, but also avoids the short life of the fan, which affects the overall reliability of the rectifier.

4. Respective attributes:
Natural cooling has no mechanical failure, high reliability, no air flow, less dust, good heat dissipation, and no noise.
Pure fan cooling is simple and cheap.
The combination of fan and natural cooling technology has the characteristics of effectively reducing the size and weight of the equipment, extending the life of the fan and adapting to the failure of the fan to a large extent.

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