EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: andybarrett1 on November 05, 2015, 04:19:48 pm
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Hi All
Looking for a means of getting a decent 24v DC supply (low current) from 230 or 415AC
Have looked at using X2 cap/resistor/zener option but no isolation from mains which will be needed...
Wondering if can still use this method but then into a switch mode so using the switch mode as isolation ???
Just looking for ideas at moment .... Has to be small and cheap !
All ideas welcome !
Thank you for reading
Andy
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The really important question here to offer a solution is for you to reveal what current you call low current?
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No more than 250mA... Maybe less than that.
A 4-20mA Loop
1 PIC Chip
2 PCB Mounted 5v Relays
3 Leds
As a start point !
TY
Andy
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You say the 24V power supply must work also using 415 RMS VAC power line input as well?
Otherwise, a transformer:
ABL6TS02B
SCHNEIDER ELECTRIC
Isolation Transformer, Phaseo Optimum, 25 VA, 1 x 230V, 1 x 400V, 24V secondary
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You can use a Buck/Boost Inverter with a transformer instead of a coil.
That would give you the isolation at the output. Feed the inverter from the X2/resistor/zener supply.
Another option is to rewire/rewind a CCFL inverter that just has a transistor based driver.
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Thanks for replies..
I also have a space constraint....
The board I want to mount this on has a size 90mm x 90mm.... And is already half populated with some logic and relays. I am aware I can use a transformer etc.... But that is not an option hence thinking about the Capacitor Drop... Not a Transformer !
Station240: Inverter / Buck Boosts are to step up usually ?
BR
Andy