How to choose a suitable switching power supply

Published: Tuesday 12 July, 2016
Switching power supply, as the heart of electronic equipment, has a very important role in the safe and reliable operation of electronic equipment. So the switching power supply should be choose in the system development phase of electronic equipment, and not in final design stage of the whole system, which otherwise tend to delay system development time and increases system cost.

The main issues to be considered when selecting switching power supply:
According to use case, setting the required output voltage and current; choosing power supply size, installation method and mounting holes, how many outputs, each output whether need to electrical isolation; input voltage range; decided the derating degree and power supply of switch power according to the ambient temperature, certification and safety standards are needed or not; the cooling method of power: natural cooling or forced air cooling; electromagnetic compatibility standards.

In order to improve the reliability of the system, the proposed switching power supply work in the 50%-80% load is better, that is, if the power is 20W, the switching power supply should be selected for the 25W-40W output power.

In order to improve the reliability of the system, the proposed switching power supply work in the 50%-80% load is better, that is, if the power is 20W, the switching power supply should be selected for the 25W-40W output power.

Clear the input voltage range, AC input, for example, commonly used in the input voltage specifications have 220V, 110V, so the corresponding 220V, 110V AC switching, as well as universal input voltage (AC:85V-264V) three kinds of specifications. Input voltage specifications should be selected based on the use of the area.

Switching power supply will consume a part of power in the work and release heat, so the user should consider the heat dissipation of the switch power supply in the system design (especially the closed system).

And there are some special cases, such as: output with a motor, printer, lighting, large relay negative impact load, transient current greatly, it is best to provide a maximum load current so that we can make special design; the system used in lightning sensitive location like lightning prone areas, or in the mountain , the design should be with the lightning protection system, and also it is best to choose the switch power supply with lightning protection function to keep the safe operation of the equipment support system.

How to choose a suitable switching power supply

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