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  1. AlienCircuits

    Transformer spec parameter - what is working voltage?

    Sure. It is in the PDF, or just scroll down and you will find it under "Technical Notes" https://catalog.triadmagnetics.com/item/audio-transformers/mil-t-27e-printed-circuit-audio-transformers/sp-48#Specifications
  2. AlienCircuits

    Transformer spec parameter - what is working voltage?

    The transformer I'm asking about has a 150 VDC working voltage, and so it is rated at 0 frequency. I should have specified the working voltage was DC, and maybe that changes my question for you?
  3. AlienCircuits

    Transformer spec parameter - what is working voltage?

    Is this the voltage that can exist across a single winding of the transformer, where it would be dependent on the lacquer or winding insulation? This is different than isolation voltage between primary and secondary windings.
  4. AlienCircuits

    H-Bridge Design for a piezo ultrasonic transducer

    I would like to understand the flaws to my approach in the schematic. In a SPICE simulation, I simplified the ultrasonic transducer with a 2nF capacitor model. The USTX Bridge signals will have deadtime between switches. I notice losses in the simulator which is why I have come here to...
  5. AlienCircuits

    Which one is harmful for human body high voltage or high current?

    Depends on your method of contact.
  6. AlienCircuits

    Which one is harmful for human body high voltage or high current?

    Both are lethal! It takes surprisingly little current to be dangerous . . it is a matter of where it is touched on/in the body and where it must travel through. In your examples, it won't matter where they touch because both are potentially lethal . . don't ever expose your body to that much...
  7. AlienCircuits

    Flyback Lm value in CRM/BCM design

    Oh my, you are right. Sorry for flopping my question so badly! This is the part I'm using actually: https://www.linear.com/product/LT3798 I came to a value of 450uH, considering 70 VAC as minimum input and max load on output as 18V and 1.5Amps. That should give me a minimum switching...
  8. AlienCircuits

    Flyback Lm value in CRM/BCM design

    I am now finding that I should not use the minimum switching frequency of 4khz, but instead choose a switching frequency minimum that will size the inductor for me. But I still think it is correct that my switching frequency minimum must be used for max load and max current draw (Vin min).
  9. AlienCircuits

    Flyback Lm value in CRM/BCM design

    I would like to use an offline PFC flyback controller that operates in critical/boundary conduction mode. http://cds.linear.com/docs/en/datasheet/3748fa.pdf I am stuck in trying to figure out what my magnetizing inductance Lm for my flyback transformer should be! The datasheet only recommends...
  10. AlienCircuits

    PFC with a CCM controller but low power

    My questions are 1. A CCM operation implies constant current draw. So how can a CCM PFC work when there is no load? What about for very low loads where it forces the inductor to have discontinuous current in it? 2. How does this impact my PFC boost inductor selection? Should I need a...
  11. AlienCircuits

    Choke Inductors in SMPS

    So this sounds contradictory to what schmitt trigger commented about chokes (other than the current-compensation thing, which I will take as advice from both of you to not use this particular choke part).
  12. AlienCircuits

    Choke Inductors in SMPS

    Thanks for the reply. I did not arbitrarily choose my inductance value and specs. I have been using datasheets, app notes, and text references to double check, triple check, etc. that I am choosing the right inductance and current characteristics for what I want to do. I will have about a...
  13. AlienCircuits

    Choke Inductors in SMPS

    Hello, be prepared for a lot of naive questions. I'd like to use a "choke" inductor as my conversion inductor (as opposed to EMI filter) in a boost PFC design. I've never made a boost PFC converter before, so I am unsure if I'm making the right choice with this inductor. My PFC will take...
  14. AlienCircuits

    Can I use a flyback transformer in a forward topology?

    Interesting. The reason I ask is of course because I'd like to use an off the shelf transformer for a forward converter. I see that cooper bussman and coiltronics offer these configurable windings parts (hexapath, versapac) and they give examples for use both in a flyback and a forward mode...
  15. AlienCircuits

    Can I use a flyback transformer in a forward topology?

    This is possibly a stupid question, but is it possible to use a flyback transformer as a forward converter transformer? It seems like a reset winding is an optional method for resetting the core for forward converters, so could I use a flyback and reset the core a different way and be fine with...
  16. AlienCircuits

    power supply isolation options

    Thanks for the advice. I think that I will be looking at the standard PFC boost stage then. - - - Updated - - - Ok, I have one more question that I might as well ask in here while its there. A ~400V output from my boost PFC regulator seems pretty standard according to what I've read. If...
  17. AlienCircuits

    power supply isolation options

    What about about low power levels, in the range of 30W or less? I found a reference design from ON semiconductor that uses a single stage flyback PFC for laptop adapters. I want to step my line voltage down to about 16-18V, and using a boost PFC stage means the input to my step down stage will...
  18. AlienCircuits

    power supply isolation options

    Hello, I would like to design my first PFC bus power supply, and I am finding it difficult to pick the right topology to work with this approach while still having isolation. It seems like most of the PFC pre regulators that I've seen online are not isolated. I think they might be isolated...
  19. AlienCircuits

    Understanding critical conduction mode converters

    What is critical conduction mode? All of the stuff I find online assumes that the reader already knows about it, and my book Fundamentals of Power Electronics doesn't say anything on it. Is this related to resonant converters (ZVS)?
  20. AlienCircuits

    Schematic symbols for solder points and edge connectors

    I understand your point, but for me to have a schematic that is linked to a PCB layout editor, I need to have nets for these connections. I also want anyone reading the schematic to understand what signals are leaving the board and how. A TP would be misleading if read by someone without...

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