24V PS_ON BOARD FOR GENERIC POWER SUPPLY
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Hello everyone,
I would like to share with you the design I use to control the 24Vdc supply.
In the attached zip you can find the geber files I used to print the boards and the part list.Please feel free to comment and suggest any improvement to the design.
[0_1620420576455_24V PSON BOARD.zip](Uploading 100%)
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Do you have any pics of the implementation or is this purely theoretical?
A description of how it works for those of us whom are less adept at reading schematics would also be helpful.
P.S.
I don't think your ZIP upload worked. Maybe use GitHub? -
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@carlacda
The Darlington Transistor would produce ~20W of heat when switched on! How do you want to cool it down?
Don't you think, the PS_ON circuit of the Duet can switch a BC337 without the 74HC driver?IMHO, the basic idea to have a 5V brick fed from Mains voltage is intriguing, but the Darlington transistor is a bad idea. Why not use a MOSFet instead?
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@o_lampe said in 24V PS_ON BOARD FOR GENERIC POWER SUPPLY:
@carlacda
The Darlington Transistor would produce ~20W of heat when switched on! How do you want to cool it down?
Don't you think, the PS_ON circuit of the Duet can switch a BC337 without the 74HC driver?IMHO, the basic idea to have a 5V brick fed from Mains voltage is intriguing, but the Darlington transistor is a bad idea. Why not use a MOSFet instead?
I agree. In our automatic test equipment for Duet 2 we use a P-channel mosfet to switch 12V and 28V supplies to the Duet under test. Also we slowed down the turn-on time a little using a R-C network on the gate, in order to limit the surge current when the mosfet turns on (at the expense of temporarily increased power dissipation).
When we used the same equipment to test Duet 3, the 28V mosfet failed after a while. The Duet 3 has more capacitance on the VIN rail, so we had to switch to a mosfet with a higher peak current capacity.
