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LaszloL3

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  • Controlling DC Converter Modules

    I did it in software with INA226 high side current sensing boards, they are cheap, calibrated oob provide voltege measuring as well and an I2C interface.

    I would not feed raw PWM into the CC pot, but first apply a low pass filter and, from that one, feed a bias current into the slider of the CC pot over a 47K resistor (value to be determined empirically.

    I did it too, but I did put a 1K / 100nF low pass filter from my 3,3v PWM output and inject/withdraw current over a limiting resistor (150K) into the potentiometer. The comparison voltage of the module is always 0,8V. That way, I can increase the voltage with PWM between 0 - 25% and decrease the output voltage with PWM >25%.The potentiometer is set to a safe 13,8V, over software I can modify the set point between 11.6 and 14.4 V.

    Hi brother Farmerkeith,we have the same aims and should share our knowledge!I had also the idea of tweaking DC/DC controllers to provide a real MPPT.Currently I have built the hardware and am scrutinizing several buck converters for suitability: I need two versions: a low power one (10W panel) that must draw as low quiescent current as possible and a mid-power one 150W panel 10A, that must b as efficient as possible.My project on Github is here: https://github.com/rin67630/Solar-BoosterIt runs on an ESP8266, uses one or two INA226 high side power monitors to measure the current/voltage and provides a deep battery monitoring over the cloud. Here a view over the dashboard:

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  • Controlling DC Converter Modules

    I had the idea independently of Instructables, but I did not dare to feed the raw PWM into the the feedback circuit. I have included a low-pass filter and a current control resistor so to inject a variable DC current into the feed-back potentiometer. From a 3,3V out of an ESP8266, I can control that way -20..+10% of the output voltage. I aim to make a solar charge controller, providing a true software-controlled MPPT battery charger which provides two convenience software controlled DC outputs.You can find my schematic here: https://easyeda.com/editor#id=88dfd92e1fe34b0a994...The software in on GitHub: https://github.com/rin67630/Solar-BoosterThe keyo f the project is the INA226 power monitor to measure the battery current on the high side.I do control the solar current by changing the v…

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    I had the idea independently of Instructables, but I did not dare to feed the raw PWM into the the feedback circuit. I have included a low-pass filter and a current control resistor so to inject a variable DC current into the feed-back potentiometer. From a 3,3V out of an ESP8266, I can control that way -20..+10% of the output voltage. I aim to make a solar charge controller, providing a true software-controlled MPPT battery charger which provides two convenience software controlled DC outputs.You can find my schematic here: https://easyeda.com/editor#id=88dfd92e1fe34b0a994...The software in on GitHub: https://github.com/rin67630/Solar-BoosterThe keyo f the project is the INA226 power monitor to measure the battery current on the high side.I do control the solar current by changing the voltage set-point and control the two convenience DC outputs over their on/off enable pin and additionally the voltage of one of them one over PWM.Enjoy!

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  • How far in kHz can you go with this sketch with a Due?

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