Search:

Type: Posts; User: asdf44

Page 1 of 20 1 2 3 4

Search: Search took 0.02 seconds.

  1. Closed: Re: Accurate mains zero cross detector circuit without optocoupler

    It seems you micro isn't isolated so why even talk about an opto? Run your line/neutral dividers into a comparator with diode clamps as dick suggested.

    Or maybe do it all digitally? Perhaps...
  2. Closed: Re: Circuitry to make Paralleled Buck converters share current.

    On a quick look I had a hard time following that one. It may be a follower scheme (where the slaves are set to follow the

    This one (though also over complicated) more clearly shows the output of...
  3. Closed: Re: Circuitry to make Paralleled Buck converters share current.

    You're overthinking it.

    Whether you have one or more inner current controllers makes no difference to the outer voltage loop. The voltage loop has some output voltage range (maybe 0-4V). Maybe...
  4. Closed: Re: Voltage input to BLDC inverters on tethered drone?

    I'd also look at Vicor, their isolated bus converters work bidirectionally. They don't say much about it but in the lower right of this they show the 48V<->800V (~1.kW) module being used to step...
  5. Closed: Re: Best isolated or differential scopes/probes

    I take it you have one? Can you say anything more about it than that?
  6. Closed: Re: Circuitry to make Paralleled Buck converters share current.

    If you share a single gate drive signal and carefully match the layout it should share ok (Easy Peasy and I agreed on this in your last thread). All the tempco's are in your favor (copper and fets)....
  7. Closed: Re: Component values on 2-pole 2-zero compensation

    Try this app note:
    https://www.renesas.com/us/en/www/doc/tech-brief/tb417.pdf
  8. Closed: Re: Voltage input to BLDC inverters on tethered drone?

    I see people talking about high frequency AC...:

    Run an LLC converter with the primary in the base and the secondary and transformer in the drone with the cable forming part of the resonant L? I...
  9. Closed: Re: Best isolated or differential scopes/probes

    Bumblebee is 50dB at 3.3Mhz
    Testec SI-9110 is 60dB at 1MHz
    Keysight N2790A is 50dB at 1MHz

    Those are all better than the Tek probe I linked above so that's useful.

    A couple others:
    Pico...
  10. Closed: Re: Best isolated or differential scopes/probes

    Thanks. So do you have a preferred differential probe or is your impression that they're all similar?

    There is an EEVBlog video discussing the design of the cleverscope and showing it off in a...
  11. Closed: Best isolated or differential scopes/probes

    Like others I'm sure, we constantly run into the limitations of our differential probes when looking at high CM slew signals like high voltage high side gate drive.

    What equipment do other...
  12. Replies
    6
    Views
    268

    Closed: Re: Feedback less PushPull Converter

    You should be able to run the forward converter 'open loop' with no feedback. Many switching supplies operate this way. But you'll get 0 line regulation and poor load regulation. Maybe this is ok...
  13. Closed: Re: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation ne

    Of course interleaving works in simulation.

    In practice I've concluded 'open loop' interleaving is possible if the gate drive duty cycles are reliably matched and care is taken to match layout...
  14. Closed: Re: Voltage input to BLDC inverters on tethered drone?

    I had some discussions with a tethered drone company and they were pushing about 1000V 1-2A DC up the cable. Resonant converters on each end.

    Drones are pretty high volume business now so it...
  15. Closed: Re: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation ne

    My first thought is that this large a ratio warrants a transformer but I wonder if modern SiC devises make the buck idea more feasible. I'd study a 1-stage implementation and see if its possible. ...
  16. Closed: Re: Is it stable that phase drop to close to 0 but rise to 75 degree when gain is 0dB

    I was implying that the added open loop gain in the 1-100hz range would result in lower closed loop error. Looking at these closed loop simulation that's not true however due to the early onset of...
  17. Replies
    3
    Views
    412

    Closed: Re: Scraping PCB causes ESD damage to IC?

    Heated buildings are often extremely dry in winter. Wearing a sweater around the carpeted office sitting in a rolling chair causes a lot of static.
  18. Closed: Re: Is it stable that phase drop to close to 0 but rise to 75 degree when gain is 0dB

    Can I ask what the application is? I’ve experimented with this compensation scheme but have only recently found other examples of it in custom audio opamps.

    I speculate that putting a limit on...
  19. Replies
    7
    Views
    527

    [SOLVED]Closed: Re: Transformer saturation & ACM control

    I'm not sure I understand the whole picture but generally the modulator of a full bridge should be inherently balanced. Residual DC offset voltage in the switching waveform will be minimal. Average...
  20. Replies
    19
    Views
    1,279

    Closed: Re: Discrete transistor voltage regulator

    I'd suggest a 1.24V TL431 variant as a replacement for Q1 (with D1 removed). A TL431 can be thought of like a transistor with a very accurate threshold voltage.

    If you want to go lower than 1.2V...
  21. Replies
    19
    Views
    1,279

    Closed: Re: Discrete transistor voltage regulator

    Yes that's it. R1 turns on Q2 which turns on Q3 which which charges C2 and the load until Vout is high enough that Q1 starts turning on and prevents Vout from rising any higher (by turning off Q2). ...
  22. Replies
    19
    Views
    1,279

    Closed: Re: Discrete transistor voltage regulator

    Regulation works like this: If output voltage is high enough it turns on Q1. Turning on Q1 pulls down on the base of Q2 which turns it off to reduce current to the load (thus voltage). If output...
  23. Replies
    4
    Views
    542

    Closed: Re: Regarding synthesis of HDLs

    Understanding synthesis and understanding the language are two different things. To understand synthesis you want to understand digital logic, how digital logic works and what's possible.


    Think...
  24. Closed: Re: ADS62P49- 14 bit ADC Output Mismatch for LVDS and LVCMOS

    You may not be understanding 2s compliment.

    11111111111100 in 2's compliment is -4. A small and reasonable DC offset.
  25. Closed: Re: Is it stable that phase drop to close to 0 but rise to 75 degree when gain is 0dB

    Is this a fixed frequency inverter (50 or 60hz for example)? If so PR (Proportional Resonant) control is another good option.

    PR control adds a tuned resonant element to the feedback that works...
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4