Open_Hamster3337
Newbie
Hi, I'm trying to calculate the input power draw of an ACDC power supply that we are using in a control chassis and am confused by what to me looks like conflicting information in the datasheet.
The power supply is an HDR-30-24 with datasheet here. I'm confused because I see two ways to calculate the input power to this power supply (assuming drawing the full rated output power for this example).
Method 1:
The power supply has an output power rated at 36 W. The input efficiency (Typ.) is listed as 89%. So 36 / 0.89 = 40 W of input power I would expect if the load is drawing the full 36 W rated output.
Method 2:
The datasheet also says that the input AC current (Typ.) is 0.88A at 115VAC. The 115VAC is rms, so I would expect the input power to be 0.88*115 = 101 W from this calculation.
Which one is correct? What am I misunderstanding here? Thanks!
The power supply is an HDR-30-24 with datasheet here. I'm confused because I see two ways to calculate the input power to this power supply (assuming drawing the full rated output power for this example).
Method 1:
The power supply has an output power rated at 36 W. The input efficiency (Typ.) is listed as 89%. So 36 / 0.89 = 40 W of input power I would expect if the load is drawing the full 36 W rated output.
Method 2:
The datasheet also says that the input AC current (Typ.) is 0.88A at 115VAC. The 115VAC is rms, so I would expect the input power to be 0.88*115 = 101 W from this calculation.
Which one is correct? What am I misunderstanding here? Thanks!