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VOLTAGE SUPPLY ISSUE!

sanjay kulkarni
Intellectual 285 points

houston we have a problem.

this is the first electronic component that has failed for me. And that too it has come a  costly tag.

can some expert answer.

the device has 5v * 3 amp voltage supply limit. cant the device survive if you supply higher voltage with lesser current?

because the first one can survive 15 w. so as long as you do not supply greater than stated wattage it should be fine?

IN my case I had a 9v, 0.5 amp adapter. assuming that it cant supply more than 0.5 amp( wall adapter. it is perfectly in functioning order), i supplied only 4.5 watts when the device can handle 15 watts.

last time, i checked in electronics. just voltage alone does not make any sense. it is voltage and amp combo which should make sense.

I mean they cant exist one without other right?

the item in question was DLPLIGHTCRAFTER2000. everybody tells me that it has gone burst because i supplied voltage higher than the rated one without looking in to the amp part. A product should not fail if its supplied wattage is less than stated wattage!

and let us not talk about folks not caring to put voltage protection( when items like arduino which cost 15 bucks have regulators)

I am not worried about failure of the product. I need to acquire proper knowledge.

any expert around here who has dealt with this? i shudder to think it is a rookie mistake as other 100 items did not punk on me.

my thinking is failure might have other causes( some current surge than above stated reason)

  • 0
    Intellectual 285 points
    oops, it could not be such a black and white question not just ohm's law. there could be lot of components. can capacitors and mosfet fail just by pure voltage alone even if the current reduced proportionately?
    or the whole system dictates what is going on. my experience tells me it is combination of things.
    i want to hear from experts mouth! experts?
  • 0 in reply to sanjay kulkarni
    TI__Intellectual 830 points

    The external power you supply to the board is input to a number of power regulators in the system. These regulators are designed to convert the 5V input to another voltage (usually a lower voltage) such as 1.8V or 3.3V. These regulators all have a maximum voltage input rating. If this max voltage is exceeded the regulator will be damaged. Power or current limit on the external power supply is not a factor in this case. MOSFETS, IC's, capacitors, diodes, etc. all have maximum voltages which if exceeded will damage the device.

  • 0 in reply to Kevin Lowderman
    Intellectual 285 points
    a voltage alone with amount of current drawn does not make sense is it not? if for higher voltage, lesser current was available than it should not harm the system. yes or no? I mean eventually all electronic component should work on power supplied rather than voltage or current aka single index?
    my argument is as long as I keep wattage under control everything should be cool. seems to have worked in analog and electrical world.

    if wattage is kept same it should not matter but because of the circuit complexity the first component took 9 v*0.15% of current supplied and it got more than the needed anyway, hence got burst. that looks like a very weak circuit as before the components went to work regulators should have done their job.

    but i do not mind to be wrong.
    as i am now in the murky world of electronic components and 5 voltage and 3.3 voltage world where the components guarantee is as good as your safety crossing india railway crosses!
  • 0 in reply to Kevin Lowderman
    Intellectual 285 points
    i do not understand why you do not refer to current in play along with that voltage. I always think V*i. unless capacitor work purely on potential difference and it damaged their construction due to potential difference despite low power.
    we cant test the theory on another expensive product.
    I am just gathering knowledge. if you do not make a mistake you would never know it.
  • 0 in reply to Kevin Lowderman
    Intellectual 285 points
    the problem now i am facing is. product is damaged goods. the extent of damage is not known. only an expert who has dived in this world could tell. meaning if regulators fail do they protect things in front of them? Or other parts also failed as regulator failed and the levy broke open. normally when you design a circuit. if regulators fail it should protect things in front of it. it should be a wall. not a damn! see my point?
    i would have myself put a 5v regulator but jack barrel made me put it directly( it was 9 v*0.5 amp).

    so replacing regulators is 5 dollars work. but replacing dlp mirror or controller is as good as buying a new one.

    it also hurts my ego that knowledge failed me( v*i in this case).
    my start up work let me try that as i thought it is not sacrosanct( they should have put a red indicator there saying that any violation will result in failure or something. but it is EVM so they can only do so much).
  • 0 in reply to sanjay kulkarni
    TI__Intellectual 830 points
    I am sorry but it is true that voltage regardless of current can damage electronics. Please have a look at this link.

    en.wikipedia.org/.../Overvoltage
  • 0 in reply to Kevin Lowderman
    Intellectual 285 points
    oops, it does not answer the question. he is assuming same current--power surge. so basically it is the way the parts are organized in the circuit and how they are drawing power might have a say.

    for example if the first unit drew say 100 mamps at 5 v and now I supplied 9 v and 500 ma. the first part would go burst as it would still get 100 mamp now at 9v. so it got more wattage than needed and it would get fried( correct?). now this condition holds true and that part can fail( in a series circuit where there is drop in amp after resistors!)

    the circuits can be designed to prevent it if you design it defensively. a fragile circuit will fail.

    Jesus, i seem to have answered my own question. But a good design can prevent it. Also i am also worried that failure should stop right there and should not propagate further. if the failure of one part did not effect other than damage would be minimal. otherwise it could be worse as the important and expensive products come after regulators( dlp controller and dlp mirror).
    there was sooty smell near dlp controller. so it looks like a levy broke!


    any addition you could add is welcome. I appreciate it.

    it helps to be a start up king! but still damage is done!
  • 0 in reply to sanjay kulkarni
    Intellectual 285 points
    i meant parallel circuit. in series the first regulator could prevent this mishap. but in parallel circuit you can have each line drawing different amount of current. so the first one got more wattage and it blew anyway.
    so it is mea culpa at the end of the day. but this fragile circuit could be fixed where in the damaged is not propagated down the line and stopped right in its tracks with first check point. see my point?
    i will study the circuit further. few months from now i would be going for more expensive dlp evms, i cant have them this fragile.
    I 'll close it after you have anything more to add.
  • 0 in reply to sanjay kulkarni
    TI__Mastermind 22880 points
    Hi ,
    Do you still need assistance or have question. If not I will tentatively close this thread.
    regards,
    Vievk
  • 0 in reply to sanjay kulkarni
    Intellectual 285 points
    hi phillippe.
    the indian supporting cast did a splendid job in fixing the DLPLIGHTCRAFTER2000: it had just a bust adopter thankfully--it was my bad as well. I could not thank one and all enough. hence forth i should stick to instructions rather than trying to act like Mr Know it all! Knowledge is power. it is never enough how much you think you do. there is always a curveball. there is always something more to be learned and humbled.
    you did awesome too.

    so this problem is solved!!!!! Hurray!!