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Automobile Battery As A Current Source To Test Electronic Load Design?

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t1d:
I have built a 30v/2a/60w e-load and I have done some testing, with a single 30/3a CC PSU. Here's that thread:
https://www.eevblog.com/forum/projects/electronic-load-project-ltv171-irfp250-with-kicad-files/

I need more wattage, for testing, so I posted a thread on paralleling my two PSUs (Schottky diodes on order.) But, even the two supplies may not have sufficient wattage, for the Single-MOSFET test rig and certainly not for the Two-MOSFET 30v/4a/120w final design.

I asked my brother for suggestions and he had what I think to be a simple, inspired idea... Just use an automobile battery.

We discussed the safety concerns that we could think of...
- The DUT input is already fused.
- Add a diode, to prevent back-flow, to the battery, should things get weird.
- Be v-e-r-y careful, when advancing the load and monitor everything carefully.

But, more advice might keep me out of some unforeseen trouble. So, is there anything else that I should consider?

I am aware of car battery safety protocols and the avoidance of explosions...

Thanks, for your help.

Benta:
4 A is peanuts for a car battery. Put two in series for ~27 V and do the testing. Just be careful not to short the battery poles somehow.

Monkeh:

--- Quote from: Benta on November 16, 2018, 09:10:43 pm ---4 A is peanuts for a car battery. Put two in series for ~27 V and do the testing. Just be careful not to short the battery poles somehow.

--- End quote ---

Or, y'know, use a fuse.

t1d:
Good ideas, guys... Thanks!


--- Quote from: Benta on November 16, 2018, 09:10:43 pm ---Put two in series for ~27 V and do the testing.

--- End quote ---
Good suggestion.

schmitt trigger:
Don't wear a metal band wristwatch when working with a car battery.

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