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Design of SMPS - Not sure what these spikes are being caused by.
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MagicSmoker:

--- Quote from: Zog on August 17, 2019, 11:35:00 pm ---...
Input voltage can be from 5VDC to 24VDC. Size ? about the size of a packet of cigarettes. Output Voltage 220VDC because I want to drive a doubler circuit to get 440VDC for Dekatrons.

--- End quote ---

A nearly 5:1 input voltage range is absurdly impractical. The only commercial supplies that accommodate anywhere close to that are universal input flybacks that can run on 85VAC to 265VAC, and even that is "only" a 3:1 range. Cramming 100W into the volume of a cigarette box is also going to be challenging, especially with the input voltage restriction.

Do you need the 220V and 440V at the same time, or is it an either/or thing?


EDIT - fat-fingered posting before finishing.
ocset:
yes, 100W from a 5V input means >20A of input current. Size may need to be bigger, but if it can be a wide pack of cigarettes, then we may be able to get near it.


--- Quote ---Only text in that file ?
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(The .txt file you can change to .asc, then  open in the free LTspice simulator)
Zog:

--- Quote ---A nearly 5:1 input voltage range is absurdly impractical. The only commercial supplies that accommodate anywhere close to that are universal input flybacks that can run on 85VAC to 265VAC, and even that is "only" a 3:1 range. Cramming 100W into the volume of a cigarette box is also going to be challenging, especially with the input voltage restriction.
--- End quote ---

Sorry I didn't make myself clear.
That voltage range is what I can deal with in terms of getting another small  DC power supply to drive it.
In other words I would be getting a separate commercial one to convert 110/240VAC to the DC provided for this design. I was thinking of just buying a meenwell or other reputable brand for the DC input.

--- Quote ---Do you need the 220V and 440V at the same time, or is it an either/or thing?
--- End quote ---

I need both at the same time.


Zog:
I just found this one on ebay. I have not done a search for a while.
eBay auction: #https://www.ebay.com.au/itm/High-Voltage-DC-DC-150V-420V-Converter-NIXIE-Tube-HV-Power-Supply-1-25-12V-adj/333261626043?hash=item4d97f0dabb:g:UKMAAOSwPbldTjVL
Could I just put two or more of these in parallel to get the mA's I need ? Is that possible ? Common mode problems ?
Might be a quick and dirty way to do it ?
Zog:

--- Quote from: treez on August 18, 2019, 12:39:24 pm ---yes, 100W from a 5V input means >20A of input current. Size may need to be bigger, but if it can be a wide pack of cigarettes, then we may be able to get near it.
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I don't have a preference for input voltage.  Looking at a mean well supply 12V or 24V DC to power it. They are quite small and are high wattage.


--- Quote ---Only text in that file ?
(The .txt file you can change to .asc, then  open in the free LTspice simulator)

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LT Spice is wayyy beyond me !
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