The Influence of 24V power supply Fan Vortex on Heat Dissipation(5)

By comparing the two analysis results, we found that during the analysis of this model, the direction of fan rotation has a particularly large impact on the distribution of the flow field and temperature field inside the 24V power supply. In terms of flow field, because the rectifier bridge part of the model is relatively low in size and the PFC radiator part is relatively high, in this case, the rotating direction of the fan has a very significant impact on the flow field. When the fan rotates clockwise, the vortex around the rectifier bridge radiator is small, and the flow field is relatively open, which is conducive to the heat dissipation of the rectifier bridge radiator. However, when the fan rotates counterclockwise, there are many vortices around the rectifier bridge radiator, which is not conducive to the heat dissipation of the rectifier bridge radiator. These differences can also be further proved by the temperature field distribution of the quotation supply section.

A modular power supply is a power supply that can be directly mounted on a printed circuit board and can be used for application-specific integrated circuits (ASICs), digital signal processors (DSPs), microprocessors, memories, field programmable gate arrays (FPGAs) and other Digital or analog loads provide power. Typically, such modules are referred to as load (POL) power supply systems or point-of-use power supply systems (PUPS). Due to the obvious advantages of the modular structure, modular power supplies are widely used in switching equipment, access equipment, mobile communications, microwave communications, optical transmission, routers and other communications fields, as well as automotive electronics, aerospace, etc.

Carefully observe the flow field animation of the fan in different rotation directions, we can see that the reason why the fan rotation direction affects the later flow field distribution is that the rotation direction of the fan determines the spiral direction of the spiral flow of the fluid at the fan outlet. Therefore, we should fully exercise this sign in the actual application process, and try to avoid the layout that is not conducive to the heat dissipation of key power components or high loss power components in the 24V power supply, so as to ensure the rationality and reliability of the thermal design.