DC Load Unit "La Carga" Episode I

RE: DC Load Unit "La Carga" Episode I

D_Hersey — Wed, 05 Aug 2015 15:46:05 GMT

Hi John, It is high summer here and I think I froze my brain through my upper palate via ice cream sandwich. Could you provide something that would give me some better idea of what you are trying to make? What would happen if your load was attached to a current source? Are you hip to these protection gadgets? http://www.littelfuse.com/~/media/electronics_technical/application_notes/resettable_ptcs/littelfuse_polyfuse_ptc_select…

Or their cousins from 90 degrees over-the-tracks, inrush surge limiters?

DAB — Sun, 02 Aug 2015 18:56:52 GMT

Great project John,

I used old high power resistors to test power supplies for telephone equipment in my first job.

I could get the resistors glowing red hot using a 48 volt 20 amp supply.

I will be following your posts with great interest.

DAB

michaelkellett — Sun, 02 Aug 2015 11:08:00 GMT

Here's an app note from IR - you are wondering into unknown territory using the IGBT as a linear device but it may work - which part do you have ?

www.irf.com/technical-info/appnotes/an-983.pdf

mcb1 — Sun, 02 Aug 2015 09:19:31 GMT

Many years ago we built a DC load at work for testing power supplies.

I wish I had kept a copy of the circuit, as it had quite a range and rather high current capability.

If I recall we simply used some decent sized resistors, and had a fan to ensure they stayed thermally secure.

It was effectively a power supply operating into a nearly zero ohm load, and the supply under test was the source voltage.

Mark

waelect — Sun, 02 Aug 2015 07:00:31 GMT

All the best for the build. Still cleaning up my lab mess at he moment so I will get started on mine in a bit.