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ceriw avatar image
ceriw asked

Help with DC-DC converter output voltage

Hi,

I've got a 50A DC-DC converter (TS800C) that I want to use to charge a 24V wheelchair from a 12V system.

The output voltage is always higher than the set voltage in TSConfig. I've set it at 27.5V an with no load, it outputs 29.5V. Even with a 10A load its still 28.3V.

What have I set wrong?

Screen grabs of TSConfig attacched.


Many thanks


noload.jpg

loaded.jpg


tsconfig
noload.jpg (168.2 KiB)
loaded.jpg (160.5 KiB)
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ceriw avatar image ceriw commented ·
Bumping post as I still haven't figured this out.

Thanks

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xxn5ac answered ·

Sometimes DC-DC converters need a load to regulate. I would try a resistive load that would sink something like 20mA to see if it straightens up. For 27.5V this would be a 1370Ω. You don't have to get the exact value, of course. Something in the 1-3.5k range should allow you to test this. Do you have access to a drawer full of resistors where you could grab one and test?

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ceriw avatar image ceriw commented ·
Tried that but no effect. Light loading it sits about 2V above the set voltage. I need to load it to about 15A before the voltage approaches what I'd expect.
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