Search:

Type: Posts; User: Easy peasy

Page 1 of 20 1 2 3 4

Search: Search took 0.03 seconds.

  1. Replies
    12
    Views
    179

    [SOLVED]Closed: Re: ACS712-5A AC Current Reading - How to?

    taking the peak in any 25mS period ( pk - pk divided by two ) should give accurate results for the peak current - a small RC filter on the signal before the A/D should get rid of the worst...
  2. Closed: Re: uc384x PWM DC-DC converter not regulating.

    Yes, when the pot is set to the bottom - you will get 44.5Vout, and 4.04V out when the pot is turned to the top - in your schematic ...

    - - - Updated - - -

    from your other thread...
  3. Replies
    3
    Views
    121

    Closed: Re: High Input Current DC-DC Converter?

    current fed push pull is a good option too at low vin - keeps the current in the devices to low levels - splitting into 2 converters will assist greatly too ...

    - - - Updated - - -

    also ...
  4. Closed: Re: Help with electromagnetic interference in Class E amplifier

    Try designing an EMC filter to reduce feed thru to your input wires, try putting all the power electronics in a thin mild steel box and earth it at the same point as the filter earths ...
  5. Replies
    26
    Views
    1,126

    Closed: Re: current-mode boost converter UC3845

    too few volts into pin 2 perhaps? it is designed to see 2v5 from the output divider at all times ....

    a soft start ckt would be a good idea too ...
  6. Closed: Re: uc384x PWM DC-DC converter not regulating.

    OK - layout is ill considered - but to get it going - try the following;

    1) 1uF MLCC 50V across R6

    2) put 1206 size 330pF for C4 soldered directly from pin 3 to 5 pins

    3) ...
  7. Replies
    7
    Views
    281

    Closed: Re: Functionl Generator 600 MHz

    this seems like a uni assignment ...
  8. Closed: Re: Mains harmonic emissions for dimmable offline LED drivers.

    agreed - large filter caps add phase shift at light loads - the key is an emc filter with more L than C ...

    I note in the spec that quite a bit of 3rd is allowed and others at 25W, if...
  9. Closed: Re: Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics

    that is impressive - are the rise & fall times in radians?
  10. Closed: Re: Mains harmonic emissions for dimmable offline LED drivers.

    FAN9611 fits the bill for controller I think ...
  11. Closed: Re: Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics

    Hello FvM, thank you for your kind remarks, can you please explain what r1, f1 is in the above? and the ratio or exact width of the 3 pulses in the above also ( middle, outer, next outer )...
  12. Closed: Re: Interleave active clamp flyback circuit

    you need to read far more about the active clamp flyback and the effect of input caps, there is literally heaps of information on manufacturers web sites ...
  13. Closed: Re: Mains harmonic emissions for dimmable offline LED drivers.

    The aim should be to make it as good as possible at the lower powers, testing other makers products is a good place to learn, below 30W there are, I think different standards for lighting products...
  14. Closed: Re: interleved active clamp flyback converter circuit

    start with < 50% pwm to make things a bit easier ...
  15. Closed: Re: How can I measure AC current with ~500 kHz frequency?

    making your own CT on a suitable ferrite toroid, with a suitable burden resistor ( non inductive ) and a good 'scope will allow you to measure accurately and in an isolated fashion ...
  16. Closed: Re: Transformer Phase shift used in isolated zero crossing detectors

    it is in fact the capacitance ( coupled with leakage L & R ) that causes the delay ....

    - - - Updated - - -

    loading the Tx should reduce the 100uS seen
  17. Closed: Re: Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics

    great work FvM, unfortunately it is a bit hard to see what you have presented, the middle pulse should be the major one - as per your sketch, the next outer pulses should be about half the...
  18. Closed: Re: Fourier analysis of 5 pulse MPWM ( multiple pulse width modulation ) for inverter

    as it is symmetric about pi/2 ( 90 deg ) this helps in the maths
  19. Closed: Fourier analysis of 5 pulse MPWM ( multiple pulse width modulation ) for inverter

    Hello All, thought I would re-post this here - as it essentially a mathematics problem.

    Determine the placement and width of a 5 pulse multiple pulse width modulated (mpwm) system - unipolar...
  20. Closed: Re: Rectifier diodes with bypass capīs & gounding speaker basketīs

    there will always be a small amount of ringing when the diodes turn off - less for faster diodes, putting 100n in parallel with the slow diodes will mean there will be some ringing between the...
  21. Closed: Re: Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics

    Hello FvM, yes your sketch is correct, the magic sine waves page does not quite cover what I am seeking ( 5 pulse unipolar ) I note that LT Spice will give me an FFT of a waveform - so I...
  22. Closed: Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics

    Hello All, we are looking at 5 pulse MPW for small inverters, 24VDC to 230Vac 50/60 Hz. ( unipolar for those tech savy in this area )

    Is there a paper or person out there who has looked...
  23. Closed: Re: Rectifier diodes with bypass capīs & gounding speaker basketīs

    An RC snubber across rectifying diodes can help remove ringing - do in fact - you need a scope to see this effect and to tune the snubber ... effect on perceived audio quality - so close to...
  24. Closed: Re: Will this ceramic capacitor be damaged by overvoltage spikes?

    hello Treez, that engineer was a bit ill informed himself - even X7R MLCC's have a characteristic of falling effective capacitance with DC bias voltage - at 1.5 x Vrated the cap will be about...
  25. Closed: Re: Will this ceramic capacitor be damaged by overvoltage spikes?

    MLCC are good for quite a bit of over-volts - the acid test is the leakage current at rated volts - when this starts going up - you have damaged it ...
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4