1, very light load use

The general module power supply has a minimum load limit, which varies from manufacturer to manufacturer, generally about 10%, because the load is too light when the energy storage components continue to flow difficult current discontinuity, resulting in unstable output voltage, which is determined by the working principle of the power supply itself. However, if the user does have light load or even no-load use, the most convenient and effective way is to add a certain fake load, about 2% of the output power, which can be preset by the module manufacturer before the factory, or the user can install appropriate resistance outside the module as the load. It is worth noting that if you choose the former, the module efficiency will be reduced. However, some circuit topologies have no minimum load limit.

2, multiple output power distribution

When selecting the power supply of multiple output modules, pay attention to the power distribution among different outputs. Taking dual-path products as an example, there are generally two types: one is dual-path balanced load, that is, the size of the dual-path current is the same; The other is unbalanced load, that is, the load current of the main and auxiliary roads is not the same, the main road is large, and the auxiliary road is small. For this product, it is recommended to choose the ratio of the power of the auxiliary road to the main road is 1/5 ~ 1/2, and the voltage stability of the auxiliary road is guaranteed in this range (can be within 5%), otherwise the voltage of the auxiliary road will be high or low. On the other hand, if the dual load is not the same, try not to choose the balanced load module power supply, because this power supply is designed specifically for symmetrical load, if the load is not balanced auxiliary voltage accuracy is not high

3. Try to reduce the temperature rise of the module power supply

The operating temperature of the components in the module directly affects the service life of the module power supply. The lower the device temperature, the longer the service life of the module. Under certain working conditions, the loss of the module power supply is certain, but the temperature rise can be reduced by improving the heat dissipation conditions of the module power supply, thus greatly extending its service life. For example, the module power supply above 50W must be installed with a radiator, the larger the surface area of the radiator, the more conducive to heat dissipation, and the installation direction of the radiator should be as favorable as possible to the natural convection of air, and the power above 150W can also be installed in addition to the radiator fan forced air cooling. In addition, in places where the ambient temperature is high or the air circulation condition is poor, the module must be derated to reduce power consumption, thereby reducing temperature rise and extending service life.

4, reasonable installation to reduce mechanical stress

The leading mode of the module power supply is all metal pins. The module power supply is connected to the external circuit and the metal pin is connected to the inner circuit of the module power supply by welding. In some special occasions, the mechanical vibration strength is relatively large, especially the radiator must be installed on the power supply of the high-power module, which is more serious. Although the general potting thermal insulating rubber inside the module power supply can play a better buffer protection role on the components, the solder joint may not be able to withstand strong vibration stress and fracture, resulting in the failure of the module power supply, then it is necessary to take other fixing and buffering measures on the basis of welding. For example, you can use a fixture or bolt (for the module with a screw hole) to fix the module with the chassis, large circuit board and other parts with good vibration performance, and put some elastic materials in the middle of them to buffer the stress generated by vibration.