Improved Efficiency 13.8V Power Supply

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paulpenn
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Re: Improved Efficiency 13.8V Power Supply

Post by paulpenn » Wed Mar 19, 2014 4:33 pm

My question is about one of your pieces of test equipment in Photo 3 of the power supply article: the "MOSFET LOAD BANK". Can you tell me about it?

Paul Pennington
Augusta, Georgia

G8RPI
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Re: Improved Efficiency 13.8V Power Supply

Post by G8RPI » Mon Mar 24, 2014 12:27 pm

Hi Paul,
Sorry for the slow response, I don't follow the forum every day.
The loadbank is home made. It is basically an array of IRF540 MOSFETs in parallel. There are source resistors to help distribute the power dissipation. A 100 ohm resistor close to each gate to stop oscillation then tied together to a variable supply. No feedback or anything fancy. Heatsink is a large 4"x4"x6" hollow block type with forced air cooling from a old inverter. Meter and shunt are ex military radio power panel. The step change is just an input pulse added to the steady DC gate bias.

Hope this helps.
Robert.

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Lenp
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Re: Improved Efficiency 13.8V Power Supply

Post by Lenp » Sun Mar 30, 2014 6:50 am

Wow,
For a while this was boiling like a pot at a small town chile cookoff? :smile:
Len
Len

“To invent, you need a good imagination and a big pile of junk.” (T. Edison)
"I must be on the way to success since I already have the junk". (Me)

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