I need help to detect an AC burned heater element

Results 1 to 16 of 16

Threaded View

  1. - 5th June 2011, 22:14 #12
    Ioannis's Avatar
    Ioannis
    Ioannis is offline SuperMod
    Join Date
    Nov 2003
    Location
    Greece
    Posts
    4,170

    Did you find this post helpful? Yes | No

    Default Re: I need help to detect an AC burned heater element

    You did not followed exactly my thought.

    Look at the attached schematic. You have to calculate the small resistor (I use SMD of 470 Ohms at 0805 size) according to bridge and Opto characteristics.

    No need for power parts.

    Light and dirty cheap.

    The integrator or a simple delay will be done in software. When you have powered your load, current will flow through the bridge. A small voltage drop is then developed across the AC terminals of about 1,4-2 volts. The reverse voltage is small enough not to destroy the opto led.

    So, when you have powered the load, normally the opto transistor will give a square waveform of line frequency. If the load is faulty, no current will flow and no pulses will be generated.

    Ioannis
    Attached Images Attached Images  
    Last edited by Ioannis; - 5th June 2011 at 22:18.
    www.signalcom.gr
« Previous Thread | Next Thread »

Members who have read this thread : 0

You do not have permission to view the list of names.

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Forum Rules