Pulling the MOSFET gate high and low.
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
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I would have put the optos in sockets…
I wonder if you know what improvement I could get from my Solar panels if I could adjust them to point at the sun as it rises with the panels 90° to the rising sun..ie vertica, and then to follow the sun and adjust the angle of the panels to remain flat on to the sun all day.
I see kit available from Bang good to at least give 1 or 2 angles of adjustment.
It looks like a job for a computer program to plot the position of the sun from a given latitude and longitude. But is it worth it? How much more power would I gain?
In the winter months it might be considerable. What do u think?
I have been watch for a nice project to add to my goodies. watched your channel many times over the years.
I have found a chip that might help. (ltc4440) Seems to be the most up to date for switching mosfets.
When is the next one due.. its been a while
Can you try with something higher voltage than the 9v and see if it improves?
For some reason that waveform made me want to have a Dunkin Donut. Make sure the scope leads aren't contributing to the distortion.
You'll want some more volts for driving the power device gate properly (12-15V is pretty common but depends on the MOSFETS you're using), it'll make sure the device is fully enhanced when turned on and also help with the charge speed as you're (more or less) fighting a passive network of parasitic inductors and capacitors. This is all assuming you have sufficient gate drive current capability. Another useful addition would be negative off state bias (5-10V should be safe depending on the MOSFETS you're using) on the gate which will help you with any common source inductance related ground bounce and crosstalk related unintended conduction (the ultimate conclusion of which is shoot through and device failure if it gets bad enough).
how about stacking another pair of optos on top ?
Or at least connecting a pair of transistors in a darlington fashion with the optos.
Language, Julian! One eighth of the speed. Not 'eight times slower'; there is no such thing. Unless it exists in some strange alternative universe, where the switching somehow goes backwards at seven times as fast?
As I told you last time, get a faster opto.
Instead of ignoring the comments people put up to help you, why not give them a thank you for their effort? You must not be a True Brit. Learn from us Canadians.
Forget the clowns that posts nonsense here, but the commenters that do suggest something useful, usually get a mouth full of nothing back.
Hi Julian, can you put the scope probe on the gate to show the gate signal please.
Thanks.. Tom….
I haven't looked up the specs on the optos, but I'm wondering if you can get more speed by having a deadspace (tri-state) in the input signal. Or if there's a way to keep from holding the opto's output transistors in saturation before switching? I'm thinking the problem may not be turn-on lag as much as turn-off lag. Either that or it's the limit on the amount of current the optos can handle.
Would increasing/decreasing the opto input current affect the output swing time at all?
"running 8 times slower" GAAAH Stop this incomputible nonsense!
might the LED switching time be a factor as well?