Three cooling methods used by switching power supply rectifies

1. Natural cooling

The natural cooling method is the traditional cooling method of switching power in the early stage. This method is mainly to rely on large metal heat sinks to perform direct heat -conducting heat dissipation. Replacement Q = KA △ T (K exchange coefficient, A changes to the heat change area, △ T temperature difference). When the output power of the rectifier increases, the temperature of the power element will increase, and the temperature difference between △ T temperature will also be added. The hot shock is small. However, the primary defect of this method is that the volume and weight of the heat sink are large. The winding of the transformer is to reduce the temperature as much as possible to prevent the rise of the temperature from affecting its operating function. Therefore, the amount of data selection is large, and the volume and weight of the transformer are also large.

2. Fan cooling

With the development of the fan production skills, the stability of the electric fan and the life span of the electric fan have greater progress, and its uniform time is 50,000 hours. After the electric fan is used, it can reduce the rough heat sink, which greatly improves the volume and amount of the rectifier, and the cost of the original information is greatly reduced. With the increase in market competition and the decline in market prices, this skill has become the first trend at the time.

The primary defect of this method is that the uniform fault of the electric fan is shorter than the rectifier, which is shorter than the rectifier. Therefore, in order to ensure the service life of the electric fan, the speed of the electric fan changes with the temperature in the device. Its heat dissipation Q = km △ t (K exchange coefficient, M the quality of thermal shift air, △ T temperature difference). M the quality of thermal shifting heat is related to the speed of the electric fan. When the output power of the rectifier increases, the temperature of the power component will increase, and the temperature of the power component changes to the rectifier to detect this change, and then add the speed of the electric fan to the speed of the electric fan. In order to strengthen heat dissipation, there is a lot of lag at all times. If the load often changes sharply, perhaps the city electric input is shaken, and the hot and cold change of the power component will be caused by the rapid heat and heat. Stress cracks occur. Make it prematurely.

3. The combination of electric fans and natural cooling

Due to the changes in the environmental temperature and the change of the load, the heat dissipation energy during power supply can be combined with the combination of electric fans and natural cooling methods. This method can reduce the area of the heat sink when adding the heat dissipation of the electric fan, so that the service life will not be affected by the external conditions under the conditions of a relatively stable temperature field. In this way, not only the defects of the cooling of the power component of the cooling pair of pure electric fans, but also to prevent the low life of the electric fan from affecting the entire reliability of the rectifier. Especially when the environmental temperature of the computer room is very unstable, the choice of cooling skills combined with air -cooled and self -cold has a very good cooling function. The cost of this method of the rectifier is between the two methods: pure electric fan cooling and natural cooling.

Especially when choosing intelligent air -cooled and self -cooled skills, the module is small under low -load operation conditions, and the module is small, and the module fan is in a low -speed operating condition.

Under high load operation conditions, the module heated up. The module temperature exceeds 55 ° C. Electric fan speed increases linearly with temperature. Electric fan problems are detected in reign. After the electric fan problem, the electric fan problem is output, and the problem is reported to the police together. Because the operating speed of the electric fan is related to the fineness of the load, the service life of the electric fan is longer than when the pure wind is cold, and its reliable is also greatly improved.

The cooling method combined with the combination of electric fans and natural cooling of the communication switching power supply can use the operating temperature inside the rectifier under the condition of high ambient temperature, the service life of the extension of the equipment, and the low environmental temperature and low load. The electric fan of the rectifier drops the speed operation and extends the service life of the electric fan. Select the heat sink to dissipate heat, and its equipment interval and climbing interval can be relatively long. In the case of high humidity, the safety function is high. The rectifier has a small volume and a light weight, making the protection operation easier.