230v or 415v AC to 24v PSU

[andybarrett1]

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

[Paul Price]

The really important question here to offer a solution is for you to reveal what current you call low current?

[andybarrett1]

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

[Paul Price]

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

[station240]

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.

[andybarrett1]

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