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Yep, linear is fine too ;)

As long as it's not PWM... I've gotten away from that approach on a few things, fans being one of them. It works, sure, but there are gotchas that neither buck nor linear involve.
Steve / Re: My Scratch Pad
« Last post by MadScientist267 on Yesterday at 06:00:48 PM »
Fowl control Rev 3 lol...



Because I ain't trying to deal with what's involved to get all this out on a regular basis...


First version was too restrictive even for the original AC blower... Second revision was too much for its BLDC fan counterparts... and when it came out, I just left it. Only really need something in there this time of year... So let's see how this goes lol

Next step involves a high voltage memo delivery system if this is still an issue... Trying to avoid breaking out the big hammers unless I absolutely need to  :o

I use this one ..... one pot for temp jump off point, and one pot for slope behavior.



Steve / Re: My Scratch Pad
« Last post by MadScientist267 on Yesterday at 05:00:39 PM »

Grrrr lol
Oztules / Re: testing the egs002 inverter board
« Last post by oztules on Yesterday at 04:50:32 PM »
thats a bt169 scr.... silk screen merges the bottom of the "b"
sensitive gate scr.

Yes, the death test can get exciting as you ramp up the power.... wondering when it will give out... I give up after the 5hp motor starts consistently, and decide enough is enough. I never expected it to drive this hard.

I am running just 16 fets ... HY4008.... small power board, which seems to be easy big enough for any application I have tried it on.

 I have decided to use the solar controller to control the grid tie via throttling too, just need time to get it built...... won't need to change much at all.

This is the one I use all the time for up to 120 amps or so..... will do more if you use heavy heavy wire.



I recommend using an infinitely variable fan set up.... much easier to live with, and lower average temps for no sound most of the time.

CV fan control is a beautiful thing, and if you can get your hands on a surplus supply of car cell phone chargers, making pure analog controllers for them is beyond trivial. The easiest ones to work with IMO are the MC34063 based units, I use them everywhere (including my inverter)... I leave them on the original boards and just modify the circuit there, but the part count external to the chip is very low and throwing things into just about any board layout would be a trivial process as well.
Nope, haven't used them, but have done the same thing with sets of LEDs. You didn't appear to be referring to an external driver. I suppose maybe context got in the way, no issue.

Along those same lines, the device I made for one particular project actually intentionally slowed the turn on time way down, and current was non trivial... using 4 MOSFETs (in parallel) and an additional cap to cause turn on to take around 0.5 sec.  Yes, they'll handle it fine if properly sunk and overrated so they don't get hot while transitioning. It was used as a soft start relay, switching as much as 40A.

Generally speaking however, faster is better.

As for "burning up a few to get an education", my circular files over time can attest that MOSFET can be a fickle thing, despite their ability to be hardcore. As a side note, one set of IRF44Z I had go off, made some of the prettiest cobalt blue light I've ever seen, just a shame it didn't last longer  :-\ ;D
You are obviously not aware of the VOM1271 which creates voltage to drive a FET and is likely similar to what is used in many of the FET modules.  They are slow turn on,but turn off is shortened.  Many other devices use the principles you talk about.  Solar panels are just big crappy diodes. Even a LED generates voltage.

One time transitions generally aren't a problem with a FET.  It's quick and dirty.  You could add a 4049 tied in parallel as a driver.  Do they still make those?  Everyone should burn up a few FET to get an education.
Oztules / Re: testing the egs002 inverter board
« Last post by ClockmanFrance on Yesterday at 04:18:42 AM »
Ac Coupling with the OzInverter voltage rise for shutting down the GTI's.

More AC coupling going in, second hand GTI's, so very cost effective way of controlling and using Solar .

The left hand SMA GTI needs for me to use my laptop to reset its internal voltage settings, its voltage shut down is presently just to high. The right hand SMA GTI behaves itself like it should.

But really the building is still a building site, but, but PV power is important...... must weld up that box section for the barn doors frames .......
Oztules / Re: testing the egs002 inverter board
« Last post by ClockmanFrance on Yesterday at 04:14:02 AM »
Hi oztules,

Looks great.

Just a foolish question from a fool.

Whats happening here?.  ht 169SCR,  Any specific recommendations ? component values, speed, etc.?

 Just doing another OzInverter so will test out your New board, and have a few made up later.

I do like your testing proceedures........ personally speaking I just don't have the bottle. !!!!!!

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