Connect with us

Zener diode

Discussion in 'Electronics Homework Help' started by OrangeArav, Jul 19, 2015.

Scroll to continue with content
  1. OrangeArav

    OrangeArav

    38
    0
    Jul 14, 2015
    I'm having trouble understanding how to find the slopes in this circuit:
    2015-07-19_000902.jpg
    Problem statement: The PWL model for the Zener diode in the circuit above is shown below. The source is a triangle wave, as shown below. Sketch the voltage across the Zener diode. Indicate voltage levels of both the source and the Zener diode when the slope changes.
    (i) Forward bias: Vd0 = 0.55V, rd = 15 ohm
    (ii) Breakdown: Vz0 = 4.8V, rz = 6 ohm

    2015-07-19_001238.jpg
    My work is shown below:

    photo 1.JPG

    photo 3.JPG
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,598
    2,364
    Nov 17, 2011
    The slope is given by the parameters of the PWL statement. The longer the time between two points of the PWL statement, the flater the slope; the shorter teh time, the steeper the slope.
    The rest follows from the simulation.
     
  3. OrangeArav

    OrangeArav

    38
    0
    Jul 14, 2015
    Harald Kapp,

    It's just a simple DeltaV.gif ?
    If that's the case then the slope seems a bit too high... For instance, the first section is 572.92

    CodeCogsEqndsd2.gif

    and the 2nd is 19814.8, slope2.gif
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    10,598
    2,364
    Nov 17, 2011
    Yes it is.

    In your circuit the slope of the voltage source's signal has only a negligible effect on the simulation result (due to the capacitance of the zener diode which forms a low passs with the resistor, but the capacitance is very small).

    Why should this be too high? The absolute value of the slope is not of interest. The problem statement is:
    , so all you have to do is look at the points where the slope changes and write down the voltage levels of source and zener diode at these points.
     
    OrangeArav likes this.
  5. OrangeArav

    OrangeArav

    38
    0
    Jul 14, 2015
    Ok, understood. Thank you!
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-