Rectifiers

Discussion in 'General Electronics Chat' started by TL314, Apr 14, 2015.

  1. TL314

    Thread Starter Member

    Mar 29, 2015
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    What would be some effects caused by an non-ideal rectifier?

    Thanks
     
  2. Papabravo

    Expert

    Feb 24, 2006
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    Exponential increase in current for small increase in forward voltage.
     
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  3. OBW0549

    Well-Known Member

    Mar 2, 2015
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    Is this for homework?
     
  4. TL314

    Thread Starter Member

    Mar 29, 2015
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    Homework questions go in the homework section. Just a general question.
     
  5. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
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    It's a hard thing to explain cause it depends on to many factors like the filter cap size ,age,esr and that's only one part ..
     
  6. TL314

    Thread Starter Member

    Mar 29, 2015
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    it wouldnt perfectly block current in one direction and transmit current in the other direction right?
     
  7. OBW0549

    Well-Known Member

    Mar 2, 2015
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    I would say a non-ideal diode (i.e., a real-world diode) would differ from an ideal diode in that it would show unit-to-unit variations in forward voltage and reverse current, as well as departures from the I/V characteristics predicted by theory. Most of these would be due to process variations and variations in the purity of the raw materials.

    On the other hand, you could say a non-ideal diode differs from an idealized diode in that it has any forward voltage drop at all, and leaks any reverse current at all.

    It all depends on what you mean by "ideal."
     
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  8. #12

    Expert

    Nov 30, 2010
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    There is also capacitance across the real junction, reverse recovery time, and the heat that is caused by the current...if I didn't repeat anybody.
     
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  9. wayneh

    Expert

    Sep 9, 2010
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    Let's not forget the voltage drop, and associated power loss.

    Ah, I see the previous posts already address this.
     
  10. hajivitra

    New Member

    Apr 7, 2015
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    nice information
    thanks all
    [​IMG]
     
  11. TL314

    Thread Starter Member

    Mar 29, 2015
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    thanks!
     
  12. OBW0549

    Well-Known Member

    Mar 2, 2015
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    One really excellent resource for understanding the multifarious "non-ideal-ness" of all kinds of components is a book by Robert Pease, Troubleshooting Analog Circuits. Pease discusses all the quirks and foibles of resistors, capacitors, inductors, diodes, transistors, LEDs, opamps, comparators and sundry other ICs. The book is a bit pricey, but worth EVERY penny because it's simply chock-full of practical information.
     
  13. #12

    Expert

    Nov 30, 2010
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    How about just download any datasheet for any diode and expect that every specification listed is describing some characteristic that is not ideal?
     
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