• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 197 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ24640: a power backup to a magnetic latch

Viktorija Cecil
Genius 17961 points
Part Number: BQ24640

Team,

My customer is considering BQ24640:

As a potential solution for a circuit I am putting together to act as a power backup to a magnetic latch (12V 7W load). When I lose main power, I need the supercapacitor to energize the lock briefly so that it will open. My thought is I could use this to charge the capacitor, and then I can design a power switch between main power and the supercapacitor.

Do you see this as being a good option, or does TI provide anything else?

Thanks!

Viktorija

  • 0
    TI__Mastermind 24075 points

    Hi Viktorija,

       Yes supercapacitors are commonly used in temporary backup systems, and you can use BQ24640 - High efficiency synchronous switch-mode battery charge controller for super capacitor - to charge the supercap.  

  • 0 in reply to Kedar Manishankar
    TI__Genius 17961 points

    Kedar, 

    Quick follow up question:

    I had a question about one of the pieces of equipment called out to test the EVM of BQ24540 - a bipoloar operational power supply/amplifier. I do not have one of these in the office, and I was wondering if there is a recommendation of what else I could use instead…Can I just use a bank of capacitors?

    Thanks!

    Viktorija

  • 0 in reply to Viktorija Cecil
    TI__Mastermind 24075 points

    Hi Viktorija,

      The Bipolar operational power supply/amplifier is used to simulate a real battery which is capable of sourcing or sinking. You can also use a bulk cap (maybe 1F or so) connected to a bi directional power supply such as a Keithley (should be capable of acting as a source or load) and connect at VBAT.