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

    sounds like a plan ...
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    [SOLVED]Closed: Re: digital integrated circuits

    often the inputs have diodes to Vcc & Vee for protection ...

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    ditto for the o/p pins ...
  3. Closed: Re: SMPS connection in three independent power source.

    You can rectify the 3 ac sources and then parallel them ( fuses..! ) as long as they don't share any common neutral on the AC side

    the PI chip based psu will happily run off the rectified...
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    Closed: Re: Current increase electrolytic cell

    The major effect is warming - as the liquids heat up -the conductivity increases and the current goes up - and it heats more ...! - it is a bit of a positive feedback spiral - a lot of...
  5. Closed: Re: uc384x PWM DC-DC converter not regulating.

    without load and soft start it will always overshoot at startup on the output and stay there for ages - this is your problem, if you choose to ignore all the advice above you will find it...
  6. Closed: Re: uc384x PWM DC-DC converter not regulating.

    you cannot have Vout < Vin due to the diode - you need to have a load on the o/p to test properly ...
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    Closed: Re: current-mode boost converter UC3845

    you cannot have Vout < Vin due to the diode - you need to have a load on the o/p to test properly ...
  8. Closed: Re: uc384x PWM DC-DC converter not regulating.

    put a load on the output ...!
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    Closed: Re: How to Measure Creepage Distance

    creepage to earth is usually from the tab to the nearest earthed metal, input to output is as it says, creepage can be from the pins ( any pin ) to earth or output as is the case required...
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    [SOLVED]Closed: Re: ACS712-5A AC Current Reading - How to?

    hello Ozzie, sorry reading code is not my long suit - I write the algorithms that are then coded by others ( less **** ups that way ) keep reading and I'm sure whatever is sticking/keeping...
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    Closed: Re: High Input Current DC-DC Converter?

    respectfully, the 26 milli-ohm res has 474 watts for 135 amps only, each of the diodes has 8 watts for every 10 amps thru - so the losses mount up for non ideal components

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    [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...
  13. 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 ...

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    from your other thread...
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    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 ...

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    also ...
  15. 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 ...
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    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 ...
  17. 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) ...
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    Closed: Re: Functionl Generator 600 MHz

    this seems like a uni assignment ...
  19. 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...
  20. Closed: Re: Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics

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

    FAN9611 fits the bill for controller I think ...
  22. 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 )...
  23. 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 ...
  24. 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...
  25. Closed: Re: interleved active clamp flyback converter circuit

    start with < 50% pwm to make things a bit easier ...
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