Editing MPPT Solar and Wind Power Boost Charge Controller
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https://www.electronics-tutorials.ws/opamp/opamp_6.html | https://www.electronics-tutorials.ws/opamp/opamp_6.html | ||
https://www.allaboutcircuits.com/textbook/semiconductors/chpt-8/differentiator-integrator-circuits/ | https://www.allaboutcircuits.com/textbook/semiconductors/chpt-8/differentiator-integrator-circuits/ | ||
− | The purpose of that is to never stop moving influence on FB until we have V=I. We do not know what the OpAmp out voltage should be! If we have no capacitor then we get a fixed OpAmp out voltage, which is INCORRECT. We must keep FB moving like a cumulative signal, like calculus integration of a positive slope keeps increasing the total. Only when the slope input difference is zero, we stop moving FB. We affect our changes at a | + | The purpose of that is to never stop moving influence on FB until we have V=I. We do not know what the OpAmp out voltage should be! If we have no capacitor then we get a fixed OpAmp out voltage, which is INCORRECT. We must keep FB moving like a cumulative signal, like calculus integration of a positive slope keeps increasing the total. Only when the slope input difference is zero, we stop moving FB. We affect our changes at a 0.2 Hz rate, well out of range of the 100Khz rate of the Boost Controller and 3 COMP circuit's 20Mhz ringing problem which I had, for example, inducing more instability on that FB pin if we do too much FB fiddling, too fast. The circuit does not work without capacitor C9. The maximum influence on FB is the two-resistors tap times Vcc (maybe <160mV max range) and notice that Vcc is very small compared to the 60v feedback's influence on FB using the same tap ratio; 800mV. |
[[File:Mppt_schematic_asof_Jul22_2012.png]] | [[File:Mppt_schematic_asof_Jul22_2012.png]] |