how zener diode works

[internetuser2k13]

Asalam-o-Alikum....!!!
can anyone tell me that how zener diode works.
i read that it works for reverse voltage..??
what does it mean by reverse voltage...??? is it negative voltage???
is it possible to achieve negative voltage...if possible then tell me how its possible.and what is its application.

thanks...!!!

 

[albbg]

In ideal diodes the current can only flows from the anode to the cathode. This means if the anode is taken at a voltage higher than the cathode the current can flows (as in a closed switch) otherwise the circuit will be open and no current will pass. In real world diodes, instead, if the anode is taken at a voltage lower than the cathode (this is called reverse polarization) the circuit will be open (even if a small current will be present) until a voltage Vbkd called breakdown voltage where a sudden and deep conduction take place. This means that after Vbkd has reached small increases in voltage cause very high increases in current (so the voltage is almost constant while the current varies very much). In this case an effect called "avalanche" will destroy the junction.
In zener diodes the direct polarization is the same as in "normal" diode, but the reverse characteristic is made usable without the risk of the avalanche effect (under the specified conditions). The breakdown is here called Vz: zener voltage.
Placing then a zener diode in parallel (after a limiting resistor) to the source will have no effect until Vz has reached; after this point the current will start to flows into the diode while the voltage is kept to Vz.

 

[internetuser2k13]

can anyone give me link for lecture..to understand well with simulations...

 

[goldsmith]

can anyone give me link for lecture..to understand well with simulations...

Hi internetuser2k13

I afraid but i think you can have a bit search in google then you'll get much of the things that you're looking for . isn't it ? for example if you search for keyword of zener diode in google then you'll see gang of links including zener diodes and how they are working . have a bit search before you ask then if you couldn't find the answer ask .
Best Wishes
Goldsmith

 

[internetuser2k13]

you exactly right.
sir i know in posted a stupid comment..but i doesnt mean to tease you for searching and posting.
you may know any good teacher that is popular in his teaching specially in electronics studies.
you give link of that certain person.
otherwise no problem i can search...
the basic purpose of asking about lecture was that..
Thank you...

 

[uday mehta]

**broken link removed**
see 5'th lecture.

 

[Mithun_K_Das]

visit: Zener Diode here.