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

48 V Low voltage alarm circuit for Battery rectifier / charger

48 V Low voltage alarm circuit for Battery rectifier / charger

(OP)
Hello there,

It is requested to please help me design a circuit for 48 volts rectifier/charger to operate a buzzer on its failure, with a variable to adjust the dropout voltage. Circuit should mark the relay and sound the buzzer as soon as the charger voltage drops to 47 or 46 volts and it should unmark the relay and stops the sounding relay as soon as the voltage returns to 48 volts.

I know it is not a complex one, but help in this regard is very much appreciable.

Thanks,

nadia
EE

RE: 48 V Low voltage alarm circuit for Battery rectifier / charger

If you use Google with the search terms: low voltage alarm circuit

...and then click on Google Images, you'll see quite a few such circuits.

You'll need to figure out what will power your circuit if the charger goes off line because of a power failure. You could perhaps use the battery bank in question, but you'll have to ponder the system / reliability implications of such an approach.

48 volts is towards the high end for many garden variety components, so you'd need to address the power supply side of the circuit if you plan to use the 48 volt battery as the power source.

Also, you might need a voltage divider on the input to bring it down to appropriate range.

PS: I'll bet eBay offers an off-the-shelf solution.

RE: 48 V Low voltage alarm circuit for Battery rectifier / charger

This link seems to offer such gadgets: http://www.so-bfd.com/ (just an example)

You should double check to make sure that the "48 volt" range actually reaches the exact voltage you want (exact voltage as opposed to nominal voltage).


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