Power supply unit

[Buddhafollower]

@SPACE Yes, indeed there are a lot of contradictions on this subject, whether triacs can be paralleled or not. I know not what to say....
Your idea on the PWM sounds really nice especially because of the fact that such reactors (dry and wet HHO reactors) the ones that forcefully produce Hydroxyl gas are best supplied from a PWM assembly so they won't get too hot over time. Say, i wonder if instead of a big IGBT i use two or three MOSFET's like FDL100N50F. I have an obsession with this transistor and i want to put it to work.

I was asking the ''electrical engineers'' from stackexchange site whatever... of a method to achieve reduction in the mains voltage to 100V and at the same time to let a current of 36A pass. Simply a power supply that doesn't use a transformer. They didn't even understood what i was asking for, they put me on hold until i ''clarify'' or ''correct'' my formulation. Unfortunately not many are like Dr.Dollard...... That's a real engineer.

I know the principle of reducing the mains voltage, is by reducing both the positive and negative portions of the sine wave. What i want to know is if and how exactly i can use tyristors to achieve that? Tyristors come in all shapes and current ratings and they are much better that triacs in high current applications. I wonder how i can connect them to get the current i need. Probably like this?
http://www.omron-ap.com/service_supp...aq02153_01.jpg
But then how do i open them, do i use an ordinary triac circuit with diac?
So many unknowns i have.............

[Buddhafollower]

https://www.mouser.com/ds/2/149/MOC3031M-195882.pdf

Above gives the schematic to fire two bact to back SCR's. I wonder if there is any additional circuitry except for the MOC3041M. Or is simply the cip and that's all?

[spacecase0]

the FDL100N50F looks fantastic. I had no idea it was out there before.
mosfets also parallel nicely

don't think you need the MOC3041M (but it might be easier ?, looks like it needs a separate power supply)
here is an alternative, and I like this one.
https://www.electroschematics.com/84...ontrol-dimmer/
I know there are more simple schematics for doing that, but I can't seem to find any on the web.

some electrical engineers are good, some are stuck in small worlds of there own creation.

[Buddhafollower]

Awesome schematic you found
I found it too, two days ago but i was unsure whether i should build the circuit or not. Now i have already ordered the components. Only problem is that i couldn't find a 2w potentiometer on the site. One change though, i will use thyristors rated for higher currents. It is interesting how it says 15A 115/230V.... Does the circuit allow the same current for both voltages? It would be very interesting if that's the case. I assume this is only for the input voltage, the current won't ever remain the same when turning the knob of the pot.

This is a very good circuit also. I will couple 2 mosfets like FDL100N50F which i have already ordered. In the case of this circuit, there will be no question of whether it will allow 36A or not. It allows even more than that
Only change is that i have to remove the T2 and R2 which are used as short circuit protection aka current limiter.
https://www.homemade-circuits.com/0-...ltage-current/

Silicon Controlled Rectifiers - New Applications in the Home, October 1963 Electronics World - RF Cafe
Here at image 10 is another good schematic diagram and quite simple. Unfortunately they don't give all details about it.

[spacecase0]

the reason the circuit works on 115V or 230V is that it just chops the power up to the phase of the incoming AC power,
so it really does not care about the voltage as to how the circuit is built.

as to the other circuit,
remember that the mosfet is absorbing all the power your other circuit is not. so, it is acting as a large variable resistor. so you will likely need a big heat sink with at fan pointed at it to keep things from over heating there.

the last link you gave seems to have enough information to reproduce it.
when figuring out the resistive components that you don't see a value for, look up the specifications for the components it connects to. figure out the current that makes it work, and then the current that breaks it... figure out the voltage across the component at the extremes it will see, then use ohms law to find the middle ground.
designing something takes a bit of work, but it is not that hard.

[Buddhafollower]

Good day,
I just solved this problem.
I used a simple PWM circuit and the FDL100N50F MOSFET and it works like a charm. This circuit is a match made in heaven although heaven doesn't exist, it can be right here on Earth
I connected a 600W load to it and the transistor doesn't even heat up. What warms up a bit is the bridge rectifier.
The control part is a simple oscillator from a cheap chinese PWM that arrived today.
It is very interesting how the power element doesn't heat up since it was burdened by a considerable load.
Now what i have left is to work on the magnetic amplifier to be able to control the current.
I was ''theorizing'' about some switch mode power supplies that i would build and to connect them in series to get 100V..... when i don't even know in what circumstances those damn things can be connected in series and parallel...
One thing i have to add though, the potentiometer has to be of higher power rating, say 1-2W otherwise it may arc inside and heat up a bit.
Duty cycle 10%-100%
The bridge rectifier must have a heat sink and be designed for 50A or more depending on the load (it can even be less than 50A).

[spacecase0]

as long as your rise and fall time are fast enough, your power transistor on a PWM circuit is going to be small, so not much heat there.
as far as controlling a PWM circuit,
it is called pulse width modulation for a reason,
you change the pulse width to change the output...
this is usually the input of the PWM circuit.

not sure what you are talking about with a magnetic amplifier changing the output.

[Buddhafollower]

I have corrected the schematic diagram. Now it is well
The magnetic amp i will use to control the current at the output
Thank you all