zeners

t.man

New Member

• Aug 21, 2009

• #1

what's the main purpose of connecting two zeners facing each other?

 

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Hero999

Banned

• Aug 21, 2009

• #2

It's for over voltage transient suppression.

The breakdown voltage is equal to the Vf plus the reverse breakdown voltage.

You can buy transient suppressors which are just two zeners connected back-to-back. The advantage is that it can be used for AC.

 

W

Warpspeed

Member

• Sep 12, 2009

• #3

The usual application for this is for use in ac circuits to clamp an ac voltage equally on both positive and negative halves of each cycle.

 

Styx

Active Member

• Sep 25, 2009

• #4

bipolarity clamp ±(Vz + Vd)
It is also used across the capacitor in OPAMP integrator circuit to clamp the output to a know level and stop the OPAMP driving itself into saturation (and thus cause issue and delays if/when it is winding out of saturation)

 

E

electronspeed

New Member

• Sep 26, 2009

• #5

This back-back connection can also be used to clip the sinusoidal signal depending upon i/p and Vz of diode.This can be extended further to generate square wave.