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