Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Three terminal high voltage zener diode

  1. Sep 12, 2012 #1
    Good day all,

    I am looking for a three terminal (zener based) shunt regulator IC that can handle at least 125V. If anyone knows where I can find it please post the url so that i can check the specs.

    Thank you
     
    Last edited: Sep 12, 2012
  2. jcsd
  3. Sep 12, 2012 #2
    Is there a new rule at Physics Forums that says questioners must not provide enough information to answer the question?

    125 volts what?

    It is perfectly possible to set up a conventional regulator to float at a suitable voltage but the details depend on information not provided such as the input and required output voltage and current levels.
     
  4. Sep 12, 2012 #3

    Mech_Engineer

    User Avatar
    Science Advisor
    Gold Member

    Have you checked the standard electronic components super-suppliers? They have advanced search capabilities that allow you to filter by component requirements like the ones you've listed.

    www.digikey.com
    www.mouser.com [Broken]
    www.globalspec.com
     
    Last edited by a moderator: May 6, 2017
  5. Sep 12, 2012 #4
    The output must be 125V DC sir. Current im looking for around 160 miliamps DC
     
  6. Sep 12, 2012 #5
    So what is the input (or supply?)
     
  7. Sep 12, 2012 #6
    the input is 85V DC however i need the zener regulator to be able to output/handle apporx 125V DC (minimum)
     
  8. Sep 12, 2012 #7

    Mech_Engineer

    User Avatar
    Science Advisor
    Gold Member

  9. Sep 12, 2012 #8

    berkeman

    User Avatar

    Staff: Mentor

    I'm with Studiot on this one -- not understanding what you are asking. You have an 85V input and want a 125V output by using a shunt regulator? Could you please be much more clear about the application and the specifications?
     
  10. Sep 12, 2012 #9
    thank you all for your input. Mech_Engineer thank you for the search i searched every site you posted and could not find. I have done a google search also and still not found that website. I am sure it will help me out i will keep you posted. I am trying to be as specific as possible. I am an engineering student learning so guys please bare with me. Any other suggestions anyone please do not hesitate to comment I will respond with updates periodically.

    God bless
     
  11. Sep 12, 2012 #10

    berkeman

    User Avatar

    Staff: Mentor

    Could you please answer my question? 85V in and 125V out with a shunt regulator?

    (Shunt regulators only work for dropping the input voltage. Vout cannot be higher than Vin with a shunt regulator...)
     
  12. Sep 12, 2012 #11
    If you have 85 volts DC that sounds rather like th old 90 volt vidor battery.

    Do you want to generate 125 volts DC from this supply?

    Whatever you actually want to do, 50 milliamps (you want 160 milliamp capability) is more than enough to kill a human and 125 volts enough to drive it through vulnerable parts of the body.

    So be very careful.

    I had worked out a scheme based on a cheap standard 24 volt regulator floating on a zener like Mech_Engineer offered (that one would be fine). I anticipated something like a 140 to 150 volt supply. You would need to provide about 100milliamps to the zener plus the 160milliamps you asked for leading to a zener dissipation of 25 watts so the 1N3340 offered would give a good safety margin.
    Because this is a pretty inefficient way to do things and large voltages are involved a geat deal of unecessary heat would be generated and all the components need suitable heatsinking.

    By the way I am sorry my first reply was a bit short but yours was the fifth post today I responded to that lacked most of the necessary information.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Three terminal high voltage zener diode
  1. High Voltage Salvage (Replies: 1)

Loading...