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  • What should be the PIV rating of diodes in the circuit

    Updated: Oct 25, 2024
    Views: 1.3K
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    hello ,

    I have assignment and there is the following question in it
    Actually I answered some of them but I am not sure
    I Drew the circuit and I tried to put here but I couldn't ,
    However, these are the questions

    1-what should be the PIV rating of diodes in the circuit ?

    my answer :
    We used bridge rectifier diode in the circuit which has PIV which should be more than 130 v in this " the maximum voltage" which should be safely applied , otherwise the diode will breakdown , also it should be at least 50 volts at room temperature because it effective by room temperature , it increase with it and decrease with it too. Another Point It is important to remember that this is a peak value of voltage not the root-mean-square (RMS) value. As a
    “Rule -of-Thumb, to provide a margin of safety, the PIV rating of a diode should be at least 3 times the RMS .
    note : 130 the input voltage

    2- if one of the diode in the rectifier is opens , what should be the possible output voltage ?

    3- if one of the diode in the bridge rectifier shorts what are the possible consequences ?

    4- discuss the effect of change in the value of filter capacitor used ?

    5- what happens to output voltage of a rectifier if the capacitor becomes very leaky ?

    6- if the primary winding of the transformer in the power supply , what will you observe in the rectified output ?
    Any change in the primary current will cause a change in the flux, which then induces avoltage in both the primary and secondary coils.

    7- the dc output voltage of the filtered rectifier is less thae it should be . what could be the problem ?

    the voltage diodes dropped because of the deplition region ​
    ==​
    please can you check my answer and help me to find the rest answer ?!!​
    thanks alot ​
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Replies
  • Rifaa

    MemberApr 8, 2009

    PIV is the peak inverse ( reverse ) voltage you can apply to a diode or PN junction before it breaks down.
    Which basically means the diode will short circuit if the PIV is reached.
    A diode has two voltage rating
    1 is forward voltage. 0.6V for a typical silicon diode.
    2 is the reverse voltage which it will block the flow of current for any given voltage.
    Zener diodes is an exception

    for ex: take 1N4001 Which is a 1 A general purpose diode and it has a PIV rating of RMS 50 volts. So to say if u apply any voltage beyond PIV forward or reverse, you'll get faulty diode. may open or short circuit, might get leaky too 😉
    I can answer the rest if u post back.
    It's really sad to see tht CE's don't visit regularly or answer newbies. I think they are too busy.
    I am too, but I'll help if time permits

    Cheers
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