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Zener diode

Discussion in 'Electronics Homework Help' started by TR-tr, Jun 14, 2015.

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  1. TR-tr

    TR-tr

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    Jun 14, 2015
    As given in the figure below, power rating and the zener voltage of the two zener diodes (Z1 & Z2) used in circuit are 1 W & 10 V and 0.6 W & 6 V respectively. Minimum zener current needed for the satisfactory operation of both zener diodes is 2 mA.

    1. If the battery has no internal resistance, find the range of RL values in which the circuit can be used as a voltage regulator satisfactory.

    2. What would happen to the operation of the zener diodes if the battery emf is changed to 10 V?
    [​IMG]
     
  2. TR-tr

    TR-tr

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    Jun 14, 2015
    Helppp me :(
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    How far have you got already?
     
  4. TR-tr

    TR-tr

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    Jun 14, 2015
    1. I thought 6 V apply on the RL resistance, when Z2 & Z1 have minimum currents. Then I found current through the R1 and then current through RL. Then I found minimum value of RL such that when Z2 & Z1 have maximum currents, I found maximum RL.

    2. When emf changed to 10 V zener diodes wouldn't work in breakdown region

    Am I correct?
     
  5. Colin Mitchell

    Colin Mitchell

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    Aug 31, 2014
    You don't have to worry about the..................







    [mod edited]
     
    Last edited by a moderator: Jun 15, 2015
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Colin, have you read the bit about helping but not doing people's homework for them?
     
  7. Ratch

    Ratch

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    Mar 10, 2013
    I just wanted to point something out. R1 has 90 volts across it, right? That means around 0.18 amps will be present in the 10 volt diode. So the 1 watt diode will be dissipating 1.8 watts. Not good.

    Ratch
     
    (*steve*) likes this.
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