How to use switching power supply

November 29, 2022

With the popularization of electrical equipment, switching power supply is widely used in our daily life, and it is an indispensable Power Supply method. Below, I will share with you how to use the power supply, I hope it will be helpful to you!

Wiring method:

L: connected to AC live wire
N: connected to the AC neutral line
FG: connected to the earth
G: Ground of DC output
+5v: the port that outputs the +5V point
ADJ: It adjusts the output voltage within a certain range. The rated output voltage of the switching power supply is fixed when it leaves the factory, that is, the nominal rated output voltage. Adjust the output voltage within the range, generally it is not necessary to adjust it.

output calculation

Due to the high working efficiency of the switching power supply, it can generally reach more than 80%. Therefore, in the selection of its output current, the maximum absorption current of the electrical equipment should be accurately measured or calculated, so that the selected switching power supply has a high performance-price ratio. Usually the output calculation formula is:

Is=KIf

In the formula:

Is—the rated output current of the switching power supply;

If—the maximum absorbed current of the electrical equipment;

K—Margin coefficient, generally 1.5 to 1.8 times

The Power Supplies will generate more interference than linear power supply, and electrical equipment that is sensitive to common mode interference should take grounding and shielding measures, according to LVD, CB, KCC, FCC, etc. EMC restrictions, switching power supply adopts EMC electromagnetic compatibility measures, so switching power supply should generally have EMC electromagnetic compatibility filter.

For example, the desktop power adaptor of Zhenhuan Electronics can only meet the above electromagnetic compatibility requirements by connecting its FG terminal to the ground or to the user's chassis.

protect the circuit

The switching power supply must have protection functions such as overcurrent, overheating, and short circuit in the design, so the switching power supply module with complete protection functions should be preferred when designing, and the technical parameters of its protection circuit should match the working characteristics of the electrical equipment to ensure Avoid damage to electrical equipment or switching power supplies.

The above is the How to use switching power supply we have listed for you. You can submit the following form to obtain more industry information we provide for you.

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