rectification questions

Discussion in 'Homework Help' started by ece_geki, Jul 23, 2007.

  1. ece_geki

    Thread Starter New Member

    Jul 5, 2007
    2
    0
    hw given to me...kinda hard to find on the net...

    1.) discuss the importance of rectification.

    2.)define ripple factor.

    3.)discuss the importance of the bleeder resistor.

    4.) discuss the effect and importance of the shunt capacitor.

    5.) discuss the effect and importance if a RC filter.

    6.) discuss briefly the applications of half-wave rectifiers.

    thanks in advance!
     
  2. cumesoftware

    Senior Member

    Apr 27, 2007
    1,330
    10
    The purpose of the bleeder resistor is to discharge the filter capacitor, since we are talking about power supplies. If a capacitor is left charged, its lifespan might decrease, hence the usefulness of the bleeder resistor.
    Of course this is the only answer I will give to you, since the other are searcheable. Not very hard if you try google. I just googled for "ripple factor" and found 19100 entries.

    I suggest the following:
    http://en.wikipedia.org/wiki/Rectifier
    http://en.wikipedia.org/wiki/Ripple_(electrical)

    You will learn more if you search by yourself. Don't expect others to solve your assignments. The best we can do is to help case you have any doubt.
     
  3. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,159
    Interesting statement. Care to cite a study or reference?

    The bleeders are in there for safety ... to provide a discharge path for the charged capacitors. In some instances, they are not connected to the capacitors until power is removed and the equipment is open.
     
  4. recca02

    Senior Member

    Apr 2, 2007
    1,211
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    maybe due to possiblity of ionization, i believe.
     
  5. cumesoftware

    Senior Member

    Apr 27, 2007
    1,330
    10
    Sorry, forgot to mention that I was talking about electrolytic capacitors. In all other capacitors, the lifespan won't decrease, of course. The reason why that happens with electrolytic capacitors has to do with corrosion, if I recall.
     
  6. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    Sounds reasonable. I just didn't find anything on the web [other than your statement] concerning the decrease lifespan attributed to the bleeder resistor and the discharge cycle.

    I guess I'll look some more, to see if I can nail down a reference or two.
     
  7. ece_geki

    Thread Starter New Member

    Jul 5, 2007
    2
    0
    thanks a lot guys...the reason why i needed the answers soon because the report was due the next day...thanks again..
     
  8. Sleepy_Monster

    New Member

    May 28, 2012
    1
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    Hallo

    [​IMG]


    There's one thing I don't quite understand about this schematic
    i need to know what the capacitors in parallel with diodes (0.01uF)
    is for
    they have very small capacitance
    so
    what is their effect on circuit
     
  9. crutschow

    Expert

    Mar 14, 2008
    13,016
    3,235
    Those small capacitors are to minimize the EMI from the rapid change in current as the diode goes from conducting to non-conducting. This EMI can sometimes be heard as a high-frequency buzz in electronic equipment.
     
  10. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Sleepy_Monster,

    This is a very old thread -circa 2007.

    Don't hijack a thread - start a new one.
     
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