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ok , I am so friggen retarded! I didn't connect the ground to the voltage divider. well, this circuit works pretty well at voltages from a few volts to hundreds without adjusting the values. so someone might like to use it. I don't know one like it is already out there so I cant reference the...
I am building a BLDC controller, the sensorless portion of it is giving me fits. I think its something simple but with several versions of it the comparator or op-amp doesn't give me an output. My test circuit gives a good 1V pk-pk AC wave biased to 1.6V at its 0. but when the inverted input...
ARRL has a good set of books that covers basic to advanced. although advanced is relative. there is a lot to know.
https://www.amazon.com/gp/product/162595140X/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
A high current, in this case the impedance of the voltage sources are not very low. the battery bank wont behave like a low impedance source. and the solar panels will drop off quickly on their voltage at high currents. short circuit current being about 15A per panel in parallel. so in the...
Easy peasy, sorry I missed that (English is my second language, my first being grunts and giggles).
I see what you mean, the voltage drop a crossed the IGBT will be essentially zero and since the drive voltage relies on that difference it will immediately settle at the threshold voltage of the...
Easy peasy, I don't really doubt its a bad circuit (which is why I posted it here) however in your explanation, how can the resistor network settle at 46V when current is flowing forward through the zener towards R2 (conventional + to - visualization) from 72V? there is a voltage across the...
FvM, the resistors don't behave like a divider. the Zener diode wont let the voltage go below that the IGBT is at. and so it wont go below a little less then 72v. when the mosfet is off the top 10k biases the voltage to supply, and the zener holds it to 12v , or 14v depending on the zener...
FVM, the output is the 72v source. so there is a differential of 20v. the zener diode keeps the voltage to 12V through the 10K resistor. the other resistor pulls that to ground weekly so the voltage remains around the 72v level when the mosfet is switched on.
dick_freebird, the time constant...
using a mosfet driven by a microcontroller, this circuit seems to work. I have been looking for similar examples around the internet and haven't found one quite like it. that leads me to suspect I am overlooking something. I have an IGBT equivalent in this circuit. I can see that it might be...
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