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230v or 415v AC to 24v PSU
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Topic: 230v or 415v AC to 24v PSU (Read 2082 times)
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andybarrett1
Regular Contributor
Posts: 133
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230v or 415v AC to 24v PSU
«
on:
November 05, 2015, 04:19:48 pm »
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
«
Last Edit: November 05, 2015, 06:10:57 pm by andybarrett1
»
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Paul Price
Super Contributor
Posts: 1419
Re: 230v or 415v AC to 24v PSU
«
Reply #1 on:
November 05, 2015, 06:52:57 pm »
The really important question here to offer a solution is for you to reveal what current you call low current?
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andybarrett1
Regular Contributor
Posts: 133
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Re: 230v or 415v AC to 24v PSU
«
Reply #2 on:
November 05, 2015, 07:01:07 pm »
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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Paul Price
Super Contributor
Posts: 1419
Re: 230v or 415v AC to 24v PSU
«
Reply #3 on:
November 05, 2015, 07:08:16 pm »
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
«
Last Edit: November 05, 2015, 07:24:55 pm by Paul Price
»
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station240
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Posts: 967
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Re: 230v or 415v AC to 24v PSU
«
Reply #4 on:
November 05, 2015, 07:18:55 pm »
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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andybarrett1
Regular Contributor
Posts: 133
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Re: 230v or 415v AC to 24v PSU
«
Reply #5 on:
November 06, 2015, 10:26:00 am »
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
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