stardustsailor
Well-Known Member
K.I.S.S
two Drivers; a standard 3 pol wire;
current difference between drivers is about 70mA, can be regulated.
View attachment 3262021
Fan-Driver:
SCW03C-12
http://www.meanwell.com/search/scw03/scw03-spec.pdf
or
http://www.murata-ps.com/data/meters/dms-78xxsr.pdf
the Z-Diode helps here to get the Voltage down to less than 36V
see max input voltage for the 7812SR-C
View attachment 3262022
Very good ideas ,there !
I liked more the compactness of Murata Solut. LM7812SR ...
But ...
Max input voltage is really close to operating voltage range of the CXA3070 ...
Ok ,zener ...There's going to be some heat there ...Most of times probably ..
But ok ...
What really troubles me is the efficiency vs load ....
The fan needs 80mA ...
Max load of 7812SR is 400mA ...
So it will be operating at 20% of max load ...
Efficiency drops less than 83% at 36 V ....
You know what ?
real problem is the large driving current range of the HLP 80H- 42 drivers I use ...
The meanWell SCW03 is really tempting and also of tiny size ...
But which type ? B or C ?
18-36 volt input ? ( when Drivers dimmed less than ~1000mA )
or
36 -72 VDC input ? ( when Drivers operate more than than ~1000mA )
So there's a large Vout range (Vin for both the bucks ) ..from ~ 33.5 up to 39.5 ..
( 25-55 C / 350mA to 2100mA )
Why not a small 'classic' 12 V psu ( AC/DC- Switching ) ?
Any ideas there ?
I much liked the compact size/ low weight of your proposals ,Guod ...
Cheers .
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