Ok...
The reason I'm asking is this:
View attachment 62619
The application needs 12VDC, but it's only needed ON rarely, when it's not use I don't want the Switcher to be working needlessly.
Also, I want the whole system to turn OFF automatically (extravagancy to spare me the effort of pulling a switch)
Explanation to the schematic:
Double NO switch is pressed closed. The AC/DC switcher starts working, and so does the system (not relevant here except for the 555 timer module). 12 VDC is provided to the Trigger of the 555 IC timer module. 5 minute countdown. P3 is the Output of the 555 IC. All the mosfet gates are connected to this pin.
The mosfet gates are now closed (?). When you release the button switch 230VAC is alternately cycled through the two pairs of mosfets to the AC/DC switcher, until the timer runs out.
(Now the 555 IC is triggered LO. The timer module has to be powered up before the trigger turns HI. I'm not sure how to solve this either, any ideas? Maybe if the press switch was a triple NO I could wire the trigger pin through it to the solid GND? )
What I need help with:
Will the 50 Hz affect the transistors somehow badly?
What happens to a Switcher if the switch is pressed multiple times quickly? I guess there would be a time lag before the transistors eventually close. Pressing the button would probably be like igniting an engine, you need to hold it pressed for a second.
How can I solve the IC trigger issue?
Any other reason why this shouldn't work?
Here is a suggested N-type mosfet that almost matches the criteria (?):
https://www.electro-tech-online.com/custompdfs/2012/03/162657-da-01-en-IRFP_450_A.pdf