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Experimenting with Flyback Transformers
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Experimenting with Flyback Transformers
Forum A 2 parter: does anyone know of a pwm controller that can work with 1.5v? and! Does this section of the element14 community remain active for like general flyback discussion?
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A 2 parter: does anyone know of a pwm controller that can work with 1.5v? and! Does this section of the element14 community remain active for like general flyback discussion?

Anthocyanina
Anthocyanina over 1 year ago

Now that the time constraints have been removed, I want to keep working on my portable chaos toy. I started by taking apart the tiny transformer (the hot air station made this super easy) to rewind it with two symmetrical secondaries.

image

image

Now my goal is to power the converter with a rechargeable AAA battery, or if getting a low enough voltage pwm controller is not possible, a single 18650. So, does anyone know of a controller that can do that? 

And well, my second question is if this section remains active in the community, or if this should be used only for the challenge and I should take my questions elsewhere? 

Thank you!

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  • javagoza
    javagoza over 1 year ago in reply to Anthocyanina +3
    If you are doing the winding yourself, you can still add an auxiliary winding to have a higher voltage, enough to power a common pwm regulator you can even use that auxiliary winding for regulator feedback…
  • cstanton
    cstanton over 1 year ago +2
    Anthocyanina said: And well, my second question is if this section remains active in the community, or if this should be used only for the challenge and I should take my questions elsewhere? We typically…
  • jc2048
    jc2048 over 1 year ago +2
    https://www.analog.com/en/products/lt1073.html
  • javagoza
    javagoza over 1 year ago

    I'm glad you keep tinkering and posting about flyback transformers.

    I hope that the hot air station has not melted or carbonized the enamel on the cable and now you have a short, I would check it first. I don't know what temperature that enamel can withstand.

    For the second question. This can be a good place to comment on transformer flybacks but I think you still have a larger audience if you post it in the passive components area.

    (+) Passive Components - element14 Community

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  • Anthocyanina
    Anthocyanina over 1 year ago in reply to javagoza

    Thank you, yeah, the wire is fine, but i used new wire anyway Slight smile

    I'll wait and see if anyone replies here with any IC recommendations, but will ask there if not. Thanks!

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  • cstanton
    cstanton over 1 year ago
    Anthocyanina said:
    And well, my second question is if this section remains active in the community, or if this should be used only for the challenge and I should take my questions elsewhere? 

    We typically don't lock down areas of the Community, but you may find that other groups are better suited for the attention of other members.  Such as the Ask an Expert Forum 

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  • jc2048
    jc2048 over 1 year ago

    https://www.analog.com/en/products/lt1073.html

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  • Jan Cumps
    Jan Cumps over 1 year ago
    Anthocyanina said:
    And well, my second question is if this section remains active in the community, or if this should be used only for the challenge and I should take my questions elsewhere? 

    Suggestion for flyback and other PSU discussions, outside the contest area:  Blog 

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  • dougw
    dougw over 1 year ago

    DRV8837CDSGR

    Is this what you are looking for? It can output any voltage although you would need to boost the input logic to 1.8V.

    There are small MCUs that will run down to 0.7V by using an internal voltage booster. Such as ATtiny43U, which could drive the H-bridge above with PWM.

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  • Anthocyanina
    Anthocyanina over 1 year ago in reply to Jan Cumps

    Thank you! 

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  • Anthocyanina
    Anthocyanina over 1 year ago in reply to dougw

    No, that's an H bridge, not a pwm controller, but thank you! Slight smile

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  • dougw
    dougw over 1 year ago in reply to Anthocyanina

    The MCU can do PWM. What functionality do you need with the PWM? - What controls it?

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  • Anthocyanina
    Anthocyanina over 1 year ago in reply to dougw

    i want this toy to be fully analog. the pwm controller is to drive the flyback converter, this time with feedback from the output to keep the output voltage from drifting as the battery discharges. Thank you!

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