Electronics > Projects, Designs, and Technical Stuff
Analog challenge exercise
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Marco:

--- Quote from: T3sl4co1l on February 07, 2020, 01:36:58 am ---the opposite of an SCR, it's on by default then snaps off at the threshold?

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Yeah, just completely block the secondary. When the secondary stays open, all the energy gets dumped into the snubber (potentially lossless, 2 diodes an inductor and a capacitor). You could probably detect that relatively simply compared to ordinary primary feedback, which requires carefully timed sampling.

PS. unshielded coreless PCB transformers probably won't make HAMs happy.
george.b:
I found this on the interwebs. T3sl4co1l should probably love it. ;D

Yansi:
My version of what I did years back. Nothing special about it, you could even rewire it to take feedback from the primary side. This way the output is better regulated.



//Take the output currrent rating with a grain of salt. It indeed could put out 100mA or so, but it is not the recommended load level ;)
T3sl4co1l:

--- Quote from: george.b on February 07, 2020, 01:10:14 pm ---I found this on the interwebs. T3sl4co1l should probably love it. ;D

http://www.aboveunity.com/content/uploads/b5d8d256-5657-4ec2-ac7c-a741014a20b4/64afe682-db35-4a86-9944-a977003ecd61_340963.jpg

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The price and component count are certainly attractive, but the idle current (4mA) blows any hope of efficiency. :)

Incidentally, NCP3063/4 is an improved version, which I don't mind so much (I even designed one in, last year).  Same high idle current though.

Tim
george.b:

--- Quote from: T3sl4co1l on February 07, 2020, 09:36:35 pm ---Incidentally, NCP3063/4 is an improved version, which I don't mind so much (I even designed one in, last year).  Same high idle current though.

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That's interesting and good to know. I've recently cobbled together a 5 to 24V boost circuit (to replace an old and tired CCFL backlight for LEDs) using a 34063 from my junk bin, all the while remembering that Imgur post of yours about it ;D I can hear a bit of whine, though, which the higher operating frequency of this improved version might take care of. Gotta try it sometime.
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