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Zener diode

TR-tr

Jun 14, 2015
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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?
UObMxo.gif
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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How far have you got already?
 

TR-tr

Jun 14, 2015
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How far have you got already?

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?
 

Colin Mitchell

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







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(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Colin, have you read the bit about helping but not doing people's homework for them?
 

Ratch

Mar 10, 2013
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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?
UObMxo.gif

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
 
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