Why does the R2520G6U2XD PSU draw less input current than the output current it provides?

Why does the R2520G6U2XD PSU draw less input current than the output current it provides?

Question:

Why does the R2520G6U2XD PSU draw less input current than the output current it provides? Is it reasonable?

Example:

PSU 1 Input current: 0.58 Amps, PSU 1 output current: 7.14 Amps. The PSU input current is less than output current.

 

Answer:

First, we need to understand the calculation method for power supply input power is: Input power = Input voltage × Input current. Here, input voltage refers to the voltage absorbed by the power supply from the power cord, and input current refers to the current absorbed by the power supply from the power cord.

The calculation method for power supply output power is: Output Power = Output Voltage × Output Current. Wherein, output voltage refers to the voltage output by the power supply to the load, and output current refers to the current output by the power supply to the load.

R2520G6U2XDBC PSU is using 220Vac as input power, 12Vdc as output power.

Then input voltage is 220V, input current is 0.58A. The input power is 220V x 0.58A = 127.6W.

Output voltage is 12V, output current is 7.14A. The output power is 12V x 7.14A = 85.68W.

So the PSU input watt is larger than output watt. It’s reasonable value.