Had a bit of free time to play with the EGS002 board recently... and this is as far as I have had time at this stage
Did a quick circuit board to match the PJ h bridge board and one I cobbled together to test initially.
The board looks like this
Is as simple as I can do for a pre run.
Here it is running a 40 watt load
It was the only filament globe I had
There is only 1 fet per bridge as in this:
I also built a little h bridge to test initially which worked fine too:
It will be noted I made it compatible with the PJ connections so if it worked I could just plug in the pj... it did.
the output looks like this @ 240v:
As you can see, my scope could not handle the output, so I turned it down a bit to 180v or thereabouts to se it complete
Later added 200 watts of resistor, and the thing behaved exactly the same.
The fet stayed cold during this, so it looks like time to use 6 fets/bank, and use the main battery bank, and a bigger transformer to see how well it drives more fets.
If the transitions stay within a decent band, it may require no more drive than the board supplies.. I can hope.....
So the test was fine, and when I get time I will expand on it.
My preference is for isolated supplies for the high and low switching... but will see how this goes first.
I ran it as low as 68vac up to 260vac, seems completely stable all the way up and down.
The 56vdc power supply is only 300w, so I went as far as I dared for the first runs.
These boards can be bought for as little as $7-$8 each from aliexpress if you want to play cheaply.
Did not get a chance to test current limits obviously, but the temp limiter works ( put it against 200w resistor).It self resets when I took the temp probe away from the resistor just fine.
Soft start works well. Starts under the 240w load no problem, smooth and clean wave. Frequency stable, and amplitude climbs to set point nicely.
Very interesting unit to start out with. I suspect you could get 600 or more watts with a single fet h bridge with 48v unit.
Edit..... I know it is hard to see the globe.... it blends in with the background well.