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Analog HV measurement does not support an offset #23

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uhi22 opened this issue Jun 26, 2024 · 1 comment
Open

Analog HV measurement does not support an offset #23

uhi22 opened this issue Jun 26, 2024 · 1 comment

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@uhi22
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uhi22 commented Jun 26, 2024

The analog input for measuring the inlet voltage is usually driven by an isolated voltage conversion board (e.g. muehlpower board), which has an output voltage >0 in case of zero inlet voltage. (typical the 4mA to 20mA for full range)
But the software just calculates
Param::SetFloat(Param::InletVoltage, AnaIn::udc.Get() / Param::GetFloat(Param::UdcDivider));
which does not consider the offset.

Discussed here: https://openinverter.org/forum/viewtopic.php?p=72086#p72086

Todo: add the offset, either as parameter or even fixed to the existing, LIM compatible boards.

@uhi22
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uhi22 commented Aug 20, 2024

As first step, added the hardcoded offset.
Next steps:

  • make the offset parametrizable
  • calculate and measure the values of offset and gain for the muehlpower board
  • add the parameters to the wiki

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