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Type: Posts; User: Swend

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  1. Replies
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    Closed: Re: Bridge Rectifier won't Rectify

    Well, I tried adding capacitance (ranging from 33p to 2.2n) across the 100M, and what I saw on the scope was that the full 6Vp-p from the signal generator appeared across the lower 100K resistor,...
  2. Closed: Re: Pulse transformer output measured vs. calculated?

    Here is the revised measurement with my newly compensated voltage dividers

    155064

    X-axis is nanoseconds
    "hi" = primary
    "lo" = secondary

    This is measured with 30Kohm load on the secondary.
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    Closed: Re: Bridge Rectifier won't Rectify

    OK, I will order some 1Megs and try your suggestion.

    - - - Updated - - -



    Yes FvM did mention that, and that's what I'm going to do today.

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  4. Closed: Re: Pulse transformer output measured vs. calculated?

    if you use a resistor instead of a reactive component e.g. the transformer, the ringing will gradually diminish with increasing resistance, until about 1.5Kohm when the pulse becomes a smooth...
  5. Closed: Re: Pulse transformer output measured vs. calculated?

    It's a commercial thing, if I were to discuss that in public, it would become public domain and then it wouldn't be commercial anymore, I'm sure you can appreciate that, I'm not trying to be a...
  6. Closed: Re: Pulse transformer output measured vs. calculated?

    There is no square pulse anywhere, what you are seeing is the pulse.
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    Closed: Re: Bridge Rectifier won't Rectify

    I calculated Z for the secondary winding to about 60ohm, and the resistive load is 30Kohm (2nd measurement) - does that qualify as hi-Z?



    Could you suggest a specific one?

    - - - Updated -...
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    Closed: Re: Bridge Rectifier won't Rectify

    Hi Brian.



    It is a single pulse, here is the oscillogram from the primary side, you have to multiply v/div with 10.000 (TEN THOUSAND) to get the correct voltage.
    155046



    I'm sure there...
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    Closed: Re: Bridge Rectifier won't Rectify

    The three oscillograms were side by side when I submitted the post, but now I see they are on top of each other, so the original post has lost it's meaning. So let's start again from the beginning.
    ...
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    Closed: Bridge Rectifier won't Rectify

    Hi friends!

    I made a simple diode bridge rectifier, except that each diodes is made up of ten STTH812 in series, and those are ultrafast 1200V 8A diodes with 100nS rrt and 400nS frt. But it...
  11. Closed: Re: Pulse transformer output measured vs. calculated?

    For voltage, a resistive 1000:1 voltage divider 100M/100K. For current, a Rogowski coil.



    I'm sure that it does, but I use the same measurement technique on the primary, so I'm hoping that any...
  12. Closed: Re: Pulse transformer output measured vs. calculated?

    Yes, could that be the reason that the voltage drops on both primary and secondary when I add more winding on secondary? I'm a little bit puzzled by that, could it have something to with the fact...
  13. Closed: Re: Pulse transformer output measured vs. calculated?

    I hear what you are saying, but there are some issues with that. First is that what's on the primary side cannot be simulated, and secondly I'm the manufacturer of the pulse transformer which a...
  14. Closed: Re: Pulse transformer output measured vs. calculated?

    Actually it's a physical circuit, not a simulation. And of-course I was wrong applying ohm's law. Basically I just wanted to check if calculated would yield something close to measured in order to...
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    Closed: Re: Metal patterns in PCBs

    I believe it's a PCB waveguide.
  16. Closed: Pulse transformer output measured vs. calculated?

    Hi friends!

    I have a 1000 ohm resistor connected to the secondary winding of my pulse transformer, and I'm measuring voltage and current which is all fine. But then I want to e.g. calculate the...
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    [SOLVED]Closed: Re: voltage and current waveforms spark gap

    Your question does not have a definitive answer. I can make a spark gap produce DC or AC (with or without harmonics) just by (thinking of) moving a wire, so there is really no substitute for a real...
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    [SOLVED]Closed: Re: voltage and current waveforms spark gap

    No, except for the name, it's not the same thing.

    Easiest solution is to simply measure it. Because spark gap mechanisms (plural) are not fully understood. Therefore you can not find a simulation...
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    Closed: Re: Waste pulse energy recovery

    This will be my new mantra, thank you.



    As I said, I learnt it from an internet friend - so now I have stricken his name from my Christmas-card list, then he can think about what he did wrong...
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    Closed: Re: Waste pulse energy recovery

    Would there at least be someone that can bring some certainty to the calculation method used here?

    I calculated power by multiplying absolute values of current and voltage, because I have learned...
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    Closed: Re: Waste pulse energy recovery

    No, only 65A peak, the current is multiplied by a factor 100 in the plot so that it is better visible.
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    Closed: Re: Waste pulse energy recovery

    I meant 'air core' as in 'something that will not saturate at that frequency (abt. 25KHz)', and I mentioned tx for two reasons, first as a impedance conversion which will allow different types of...
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    Closed: Re: Waste pulse energy recovery

    Don't blame me ;-) All the knowledge I have is from the internet and my internet friends like your good self, and such friend told me that you use absolute values if it is a resistive load as...
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    Closed: Re: Waste pulse energy recovery

    That's because they are not in phase.



    Yes, that is what I did to calculate average power. And I used the absolute values because it is a resistive load.



    I don't know the applied pulse,...
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    Closed: Re: Waste pulse energy recovery

    All pulses of the same length have the same energy. shorter pulses have less energy, longer pulses have more energy, but for all pulses the average power is the same. Once you have decided a desired...
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