I have a long (20 - 50 m) copper wire for supplying DC power. One one end there is a AC-DC converter supplying 600W-1000W of power at 60V output. At the other end I have a switching type (100-140 kHz) DC-DC converter out-putting 24/12 Volts for a power requirement of 400W-800W.
I understand that there will be large line losses due to the DC transmission at such low voltages and high power. But I am more worried about the EMI effects of the long wire on the switching type DC-DC converters.
The wire will have significant inductance and resitance. How can I choose appropriate bypass or decoupling capacitors for the DC-DC converter in order to mitigate the EMI effects due to this lengthy wire?
As of now I have planned to use the following capacitors near the DC-DC converter:
1) 4.7 nF between all the input/output terminals and the baseplate/ground to eliminate high frequency common mode noise,
2) 0.2 uF between the input terminals to handle high frequency differential mode noise,
3) 100 uF between the input terminals to handle low frequency components and current droops on the power supply,
4) 0.01 uF between the output terminals to handle high frequency differential mode noise,
Are these capacitor values appropriate? Also I need some guidance on what can be done on the AC-DC converter end to improve the EMI filtering?