​How to choose a switching power supply？

There are many types of switching power supplies, but many people do not know how to choose a switching power supply. Buyers can choose a suitable switching power supply based on the components of the switching power supply and other related characteristics, such as parameters affecting heat dissipation and switching speed. You can also choose the DR-Din rail power supply based on these parameters. Now let us introduce in detail how to choose a switching power supply.

Here is the content list:

Select the required safety regulations

Select various functions according to application needs

Consider the load characteristics

Consider the work environment

Choose a suitable input voltage range

Choose the right power

Select the required safety regulations

According to the usage, determine the output voltage and current that the switching power supply may need. Measure the size, installation method, and installation hole position of the switching power supply. Confirm that the switching power supply has several outputs and whether each output needs to be electrically isolated. Determine the input voltage range. According to the ambient temperature, determine the degree of derating of the switching power supply and the power of the switching power supply. Consider whether certification and safety standards, electromagnetic compatibility standards, etc. are required. Try to use the standard power supply of the power adapter manufacturer, including the standard size and output voltage, so that the delivery period is faster. On the contrary, the special size and special output voltage will extend the delivery period and increase the cost.

Select various functions according to application needs

Protection functions: over-voltage protection (OVP), over-temperature protection (OTP), overload protection (OLP), etc.; application functions: signal function (normal power supply, power failure), remote control function, telemetry function, parallel function, etc.; special Function: power factor correction (PFC), uninterruptible power supply (UPS). There are other switching power supplies with different functions, you need to choose according to the application.

Consider the load characteristics

In order to improve the reliability of the system, it is recommended that the switching power supply work at 50%~80% load. That is, assuming that the power used is 20W, a switching power supply with an output power of 25W-4OW should be selected. If the load is a motor, a light bulb, or a capacitive load, and the current is large at the moment of starting up, a suitable power supply should be selected to avoid overload. If the load is a motor, consider the voltage reverse during the shutdown.

Consider the work environment

Temperature and the presence or absence of additional auxiliary cooling equipment are all requirements for selecting a switching power supply. In an excessively high environment, the power supply needs to be derated output, and the derating curve of temperature versus output power should be referred to.

Choose a suitable input voltage range

Taking AC input as an example, the commonly used input voltage specifications of switching power supplies are 110V and 220V, so there are three specifications for 110V, 220V AC switching, and universal input voltage. The input voltage specification should be selected according to the area of use.

Choose the right power

The switching power supply consumes part of the power when it is working and releases it in the form of heat. In order to increase the life of the power supply, it is recommended to choose a model with a 30% more output power rating.

All in all, the switching power supply should select the required product type, voltage, power, etc. according to the required scene. The choice of DR-Din rail power supply is also similar to the choice of switching power supply, you can compare them before buying.

Zhejiang Ximeng Electronic Technology Co., Ltd. continues to innovate technology and improve product quality.