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Topic: Really universal soldering controller (Read 714043 times) previous topic - next topic

Re: Really universal soldering controller

Reply #2850
. . .
Also do you mind sharing your HW and FW for auto switching between 12V and 24V?
. . .
You can increase the control over heater not only by limiting supply voltage 2 times, but also by increasing the work frequency by 2( to help to PWM for that specific load) . In both cases you will reach the same result and save hardware implementations, but this will eat your program time.  Or at least to decrease min pulse width for that tool

Re: Really universal soldering controller

Reply #2851
If it is not yet at the border

Re: Really universal soldering controller

Reply #2852
but also by increasing the work frequency by 2
Good only for DC supply. On AC it would possibly be asymmetric to the transformer and it will be DC biased. Magnetics doesn't like that stuff. Again, Sparky already explained this.

Re: Really universal soldering controller

Reply #2853
Good only for DC supply. On AC it would possibly be asymmetric to the transformer and it will be DC biased. Magnetics doesn't like that stuff. Again, Sparky already explained this.
Actually we have AC followed by a bridge rectifier and if it has some deviation it will be bigger now, than on double frequency sampling and driving. And also, it is on 2 times less load ( we speak about correction for the 40W handles and tweezers )

Re: Really universal soldering controller

Reply #2854
We can speak about magnetizing if it is under constant asymmetric phase load, here the case is different, strong load for a some seconds, pause, demagnetizing ( heat over trf.), next heavy load would be in phase or opposite phase and if we have week transformer only under constant heavy load we have to be careful to count that.


Re: Really universal soldering controller

Reply #2856
why reinvent the wheel, transformer with two windings + toggle switch.

Ideally a relay switch actuated by firmware: If a 12v tool is detected, the relay switches the transformer secondary automatically. Would that be feasible?

Re: Really universal soldering controller

Reply #2857
Did someone try  the overshooting,   is it exist the time of soldering or only on the flying cartridge

Re: Really universal soldering controller

Reply #2858
verified version of the profile on 13.2v. for lovers and those who want to try and experiment

Re: Really universal soldering controller

Reply #2859
verified version of the profile on 13.2v.

Сделайте ролик с графиком 1. набор температуры, 2. пайка крупного полигона профиля, 3. макание жала в мокрую губку термостабилизация) для 115-серии.

make a schedule with the work of the sting 115.

Re: Really universal soldering controller

Reply #2860
Ideally a relay switch actuated by firmware: If a 12v tool is detected, the relay switches the transformer secondary automatically. Would that be feasible?

I will do it like this, in iron profile I have extra field min/max volgate
And mcu will switch between 12v and 24v according to profile

Re: Really universal soldering controller

Reply #2861
Guys,

Did anyone connected two T12 tip irons to the sation aka as tweezers and could you share witing diagram??

Re: Really universal soldering controller

Reply #2862
I will do it like this, in iron profile I have extra field min/max volgate
And mcu will switch between 12v and 24v according to profile
It will not be so easy as it looks like, Let say you will be able to make a switching on time for some ms without Vin to drop less than 1.4V ( there isn't any  accumulating, filtering capacitor at a bridge rectifier to keep it). it comes the next catch - not all transformers come with marked 'beginings' of the secondary windings, we will have 2 of them and if you connect them opposite, the current will be excessive.
vulkan35 mark "we have to be careful to count that.", but that wasn't the key phrase, it was "here the case is different"

Re: Really universal soldering controller

Reply #2863
( there isn't any  accumulating, filtering capacitor at a bridge rectifier to keep it)
Actually it has 440uf, but will it be enough?... may be yes

Re: Really universal soldering controller

Reply #2864
Actually it has 440uf, but will it be enough?... may be yes
No, it senses rectified AC, there is nothing to do with any MCU supply filtering. There is some firmware filtering, but I didn't analyze what exactly FW is doing in this regard. And it actually don't have to be that strict. If adding such a feature, power lost detection could be just blocked for a couple of mains periods, forty odd ms should be plenty to switch a relay, and not even close to VDD dropping below brown-out threshold. It's somewhat half a second power lost message is held on the display prior it shuts down.
Phasing out a transformer is pretty easy, basic stuff, no big deal even for a beginner.