So would you advise against installing this new controller into the oven itself, say an infrawave oven? Or is that the purpose of the higher Tg PCB’s?
I would really like to be able to put together an all in one setup, so I can just plug in the oven like normal, then hook up a laptop to set the profile. Set and forget.
I just looked at your graphs, reflowing a whole board in under 4 minutes?! I need to get onto this oven stuff, hand soldering is too slow!
Let me know when these are available (or if I can get one now and update it when the software is finished)
yes, if you take off the circuit board standoffs, and we will have the option to order with no terminal blocks, so it will make for a very slimline solution
also options to delete headers and DC power jack.
so it can be as slimline as u want it to be (that would be as tall as the mini USB jack with all those things deleted)
its a very flexible solution for your custom application.
So I’m trying to understand why you would use a cycle time of anything smaller than 8.33ms. Even if you can get the SSR to turn on at a random time (and many SSRs will), it will not turn off until it hits the zero crossing, which occurs every 8.33ms.
I would think the best way to do this would be to phase control the SSR, by locking to the line frequency so that you can turn the SSR on at a know time relative to the next zero crossing. This would give you the best duty cycle control possible, but you still can’t do it faster than using a 8.33ms period (by any method).
I agree that the result is excellent, but I don’t see any significant change between 2.5 and 5 ms periods, and my reasoning would explain it. In general, this process is fairly slow, so I can’t imagine that there would be much benefit, if any, to controlling faster than 120Hz, and it wouldn’t surprise me if an even slower control rate would work just as well.
Can you point me to an off the shelf SSR that can turn off at points other than the zero crossing? I agree that you can design one from scratch using IGBTs, or FETs, but most individuals will not do this.
BTW, Breville has a really nice counter top oven that I am considering using as a reflow oven. It uses IR heaters, has an output of 1800W, and has a convection fan, though it is larger than most (and expensive). But, it looks to be really solid, and could likely be insulated easily, which would allow for faster ramp rates.
