Guru
Joined: 02/02/2017
Location: AustraliaPosts: 1424
| Posted: 08:02am 09 Jan 2023 |
oh yeah, THIS is what we are talking about.
The entire project was to my mind seeing what junk we have lying around that we could use to replace $1,300 units.
The inductance is not the only thing that is important, you need to also know if it is saturating at the working conditions you are employing.
I am lucky to have a good DSO and current sensors so I can prove the choke is not saturating in use.
3kW and 120uH seems "about right" but if it's getting hot and the efficiency is not that great (maybe lees than 90%) then maybe the choke is saturating.
For a small cost of switching losses, you can halve the work load of the inductor.
Just move to 40KHz PWM from the menu.
Maybe you will see less heat in the choke and a tiny more on the heatsink..
From the numbers above I see
98.2 x 30.4 = 2985 Watts input
and
58.1 x 50.3 = 2922 Watts output.
efficiency of the DC-DC conversion is 98% and that is fantastic.