INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

HID lamp power supply

HID lamp power supply

(OP)
I have a low power mains operated HID lamp power supply with a problem I am trying to diagnose.  My question is what exactly is this diode, Panasonic B2ZAZ0000020.  Looks like a standard 4A axial lead high speed diode.  No conductivity in either direction, not even a uA till you get to about 250V.  This is located on the primary of a H bridge driven ballast.  I've searched to no avail and know it is bad.  Others have reported that good ones conduct in one direction.  My guess this is one of those TVSS high speed zeners used in clamping surges and that the internal reverse diode has failed open. My usual source is back ordered for more than a month.  Any designers know if TVSS diodes are used in these supplies?  I'm about ready to parallel the bad one with a high speed diode and see if it will work. I can eventually get the correct diode, but really curious of what this is.  Never seen a diode fail like this.

RE: HID lamp power supply

You got me.

It doesn't look particularly like a TVSS diode. However your test seems to denote it is.

Keith Cress
kcress - http://www.flaminsystems.com

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close