Guru
Joined: 21/06/2018
Location: AustraliaPosts: 1156
| Posted: 01:46pm 13 Mar 2019 |
Hi Poida, good to see you having so much fun. Today I received my digikey order with the opto-fet drivers etc so in the near future I will glue some bits onto a PCB make sure it works ok and send some stuff over for you to play with. Not really looking forward to fitting the smd parts though, thats the payback for being stingy & fitting too much on a small PCB.....
I should also get my control PCB back hopefully within the week so I will populate some bits on that too including the bits for isolated supplies. It uses a synchronous sample and hold I codged up which holds the peak value of the output each half cycle of AC until you have read it after the zero cross.
I incorporated 2 types of LED opto drive for the power stages from the Nano1, either IR2184s or a quad exclusive or gate. The exclusive or gate is meant to drive the optos for the top and bottom half bridges in inverse parallel as per Warps anti crossover/deadtime method.
If using the 2184s they can just drive the optos separately as the 2184's have deadtime built in. The changeover from inverse parallel to separate is achieved with 4 x pluggable links. (the exclusive nor is a lot cheaper than 2 x 2184's so will be interesting too see the outcome)
I also have a triple toroidal hiflux choke ~ 80uH that laughs at 70A I havent been able to saturate it yet but will find its limit soon, it is considerably better than the overgrown gapped ferrite E cores I have also been playing with, Ill send that too. I havent got any batteries or a decent toroid wound yet so in sending some stuff to you, at least I wont have to sweep up any charred plastic bits or clear the smoke from my shed
If at first you dont succeed, I suggest you avoid sky diving....
Cheers Mike