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  1. N

    Flyback + Cap charging time, help

    Looking back, i'd like to say there was no need for somewhat heated exchange of words. Let's call it mutual misunderstanding. To recap on the subject, for "normal" (non flyback) transformer, i'd summarize it like this to cover all the angles. When transformer is unloaded (secondary open) only...
  2. N

    Flyback + Cap charging time, help

    Eh. Accusing me of snarky comments while using those emojis all the time, my my. If you understood even remotely how transformers work you would be appalled by the amount of idiotic statements you made in this thread, to remember just a few. Just this statement deserves a medal of shame...
  3. N

    Flyback + Cap charging time, help

    Core inductance is a term that doesn't really make sense. Inductance is a property of conductors. Permeability of the core material is just one of factors affecting the coil's inductance. Yea you are and you asked for it. It has everything to do with amount of energy transferred. They are...
  4. N

    Flyback + Cap charging time, help

    That formula is energy stored in an inductor, inductor is coil + the core. Many factors affect inductance of the coil, number of turns, solenoid length, coil radius and finally permeability of the core material. Core inductance is one of many factors affecting the coil's inductance. You seem...
  5. N

    Flyback + Cap charging time, help

    Ok, you noted some basics, some of them not true ("normal transformer never stores significant energy in the core"..) and then you concluded that they are two totally different things and thus cannot be compared (again, not true). I'm not a condescending know it all, would i be asking for help...
  6. N

    Flyback + Cap charging time, help

    That is assumed, basics. It does when secondary is open. It stores significant energy and then returns it, this is reactive power meaning voltage and current are 90° out of phase or near. For energy transfer to occur voltage and current must be in phase (except in antennas). Also, even when...
  7. N

    Flyback + Cap charging time, help

    FB teardown (3) Flyback Transformer Teardown - YouTube
  8. N

    Flyback + Cap charging time, help

    I got a question about flybacks. We all know the principle of the flyback, exactly the same principle used in bucking converters and ignition coils, feed, break, collapse, repeat.. the thing is i'd like to convey max power from the supply and i don't like the fact that power is conveyed only...
  9. N

    Flyback + Cap charging time, help

    Yes, i'm aware of that, i used a steady current to simplify the calculation. I did not write it here but i did write it on stackexchage, that high duty cycle is to be used, so figures should not be far. Of course not too high duty cycle cause we sure don't want to feed pure DC to the primary...
  10. N

    Flyback + Cap charging time, help

    I asked this at stackexchange, they told me to use I = C dv/dt (current through a cap formula) rearranged to solve for t so t = C * V/I. So t = 0.000001F * 5000V/0.02A = 0.25s.
  11. N

    Flyback + Cap charging time, help

    Can you help me figure out how long it takes for a let's say 100W flyback outputting full wave rectified 5000V pulsed DC at 20mA to fully charge a 1uF cap? For simplicity of things we can assume a pure DC 5kV source that can output 20mA max. I am using 20mA cause that is approximate output...
  12. N

    Increasing Voltage With Multiple Ignition Coils?

    Yes, two coil circuit is well known and there are multiple videos on youtube. They can be connected in series or antiparallel. First image is the simplest and best diagram showing an IC circuit and some explanation. Now regarding series and parallel, it is easy to understand how output is taken...
  13. N

    Woo-Woo MOSFET switch question

    I am sorry that you see it that way cause i wasn't offensive nor expressing superiority in any way, i am grateful for the help of the forum members, they have all been polite and helpful in some way. I used the term "magic" only to describe the common disbelief toward overunity devices...
  14. N

    Woo-Woo MOSFET switch question

    Maybe. I guess i could add a HV diode to produce pulsed DC which is what i want. But then i could not vary the frequency, unless i change inductor or capacitor - maybe with that haircomb cap like used in a radio. I don't know, MOSFET seems simpler way to go and more precise frequency wise.
  15. N

    Woo-Woo MOSFET switch question

    The MOSFET i mentioned before (up to 4.5kV at up to 2MHz) will do.
  16. N

    Woo-Woo MOSFET switch question

    I understand high voltage safety and i was considering a lot of IGBTs, but their voltage and frequency are limited, up to 1200V for 30-60kHz (there are some expensive ones that can handle few kV) and 600V for 150kHz. I am considering one of these but it's a trade off. MOSFET i mentioned before...
  17. N

    Woo-Woo MOSFET switch question

    You clearly misunderstood, i'm a noob for semiconductors only, not for electronics and physics. In fact, some things i do would seem impossible or "magic" to you. Let's just say electron is a deflected magnetic field, always a wave, never a particle. As such, these can be easily created with no...
  18. N

    Woo-Woo MOSFET switch question

    Ok.
  19. N

    Woo-Woo MOSFET switch question

    Yes i know, i am considering this function generator which can output 20Vpp. I will also need a driver since impedances are 4 to 50, so this FG couldn't drive it into saturation by far. At IXYS they recommended one of these.
  20. N

    Woo-Woo MOSFET switch question

    Yes, as AnalogKid said, "As long as the input signal and output +Supply share a common GND, it is no problem". That video was just an example. I won't use that MOSFET but this one or a similar one rated for high voltage. I referred to ground being a source of electrons as in the circuit...
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