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Add MPPT, Original CC/CV, Reduce ADC Jitter and fix LCD freeze on DPS5020 #241

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Add MPPT, Original CC/CV, Reduce ADC Jitter and fix LCD freeze on DPS5020 #241

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art103
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@art103 art103 commented May 25, 2021 •
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Hi,
Please find a pull request for the following changes:

  • Apply the LCD freeze workaround to the DPS5020 model.
  • Reduce jitter by using ADC oversampling

art103 added 9 commits May 25, 2021 08:18
@art103
Fix LCD freezing on DPS5020 models.
c3aead8
@art103
Reduce jitter in ADC values / readings.
548a4c5 
Apply oversampling to the ADC values to reduce jitter (OVP / OCP) and LCD readings.
@art103
Add limit checking to fast loop.
77a1b93 
Turn output off if v_in drops below threshold for current output voltage.
Control the fan automatically on DPS5020 to mimic original firmware.
@art103
Add 'W' character to font sets.
dd035a2
@art103
Fix assert code in CONFIG_RELEASE mode.
7b574b6
@art103
Add Watts display and implement original CC/CV behaviour.
427e623 
This replaces CC / CV / CL with a CCCV screen.
The use of a SW i_limit is replaced with the HW DAC for limiting current.
This makes the unit behave much like the original, without the SW limit cutting power.
The SW limit is now set to the maximum output current supported by the DPS model.
@art103
Add MPPT support / screen.
27147ac 
Be careful with this!
This screen automatically enables the output (so it starts when the solar panel generates power).
It uses a binary tree search to quickly find the maximum power point of the input source.
The output is limited to the voltage / current limits set on the screen.
@art103
Add CC/CV and MPPT graphics.
d8b56d2
@art103
Update names in CC/CV and MPPT screens.
1ee3f37
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art103 commented May 25, 2021

Oops, sorry - the pull request was only supposed to be for the first 2 commits.
The rest are entirely optional, but CC/CV makes the unit behave much more like the original :)

@art103 art103 changed the title Fix LCD freezing on DPS5020 models. Fix LCD freezing on DPS5020 models and reduce ADC jitter May 25, 2021
@art103 art103 changed the title Fix LCD freezing on DPS5020 models and reduce ADC jitter Add MPPT, Original CC/CV, Reduce ADC Jitter and fix LCD freeze on DPS5020 May 25, 2021
@eliasmagn
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eliasmagn commented Aug 2, 2021 •
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I can confirm its working, flashed on dps5020 v2.6. nO BUGS yet.
I build from your master branch and i wonder how you would use mppt? Any documentation?
Its a bad decision to start in mppt mode! Couldnt we set cc/cv mode as default instead?
I created pull request to your fork!

@polihedron polihedron mentioned this pull request Dec 11, 2021
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@ItsMeAubey
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Hi @art103,

Does your re-implementation of the cc/cv mode work with control over serial?

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art103 commented Feb 7, 2023

Hi @art103,

Does your re-implementation of the cc/cv mode work with control over serial?

It was a long time ago and I haven't tried it, but looking back through the code changes, I think it should...

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art103 commented Feb 7, 2023

I can confirm its working, flashed on dps5020 v2.6. nO BUGS yet. I build from your master branch and i wonder how you would use mppt? Any documentation? Its a bad decision to start in mppt mode! Couldnt we set cc/cv mode as default instead? I created pull request to your fork!

Sorry - it's been a while!
I agree that for normal use cases, starting in MPPT is a bad idea. For my use case, the unit would power down when there was no solar input, and I wanted it to come up in MPPT mode.
I ended up modifying one of my units to have HW controlled PWM based on Input Voltage instead of Output Current. This allows much better (and faster) MPPT control targeting a particular solar panel voltage after doing a MPPT sweep.

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3 participants
@art103 @eliasmagn @ItsMeAubey