dc ot dc converter

Discussion in 'The Projects Forum' started by sujinvipin, Sep 8, 2011.

1. sujinvipin Thread Starter New Member

Aug 18, 2011
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0
i have a dc to dc converter of 48V input and 24 volt output giving 20 Amp maximum output current , now how can i calculate the current input or drawn by the converter?

2. SgtWookie Expert

Jul 17, 2007
22,183
1,728
PowerOut = PowerIn / ConverterEfficiency
Vout * Iout = Vin * Iin / ConverterEfficiency
24V * 20A = 48V * ?? / ??

Substitute, isolate the unknowns and solve.

3. sujinvipin Thread Starter New Member

Aug 18, 2011
28
0
Shall i confirm with it or is there any better solution

4. SgtWookie Expert

Jul 17, 2007
22,183
1,728
What is the problem? Is that too complicated?

If you don't know the converter efficiency, you will need to calculate it by:
Efficiency = PowerOutput / PowerInput
You already know the output power requirement, correct? 24v * 20A = 480 Watts.
You already know the input voltage, correct? 48V, right?

So, you need to at least find out one of the two missing variables; input current, or converter efficiency.

If you don't know what the converter efficiency is, then guess low. Estimate 75% to 80%.