BQ24640: a power backup to a magnetic latch

Viktorija Cecil

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

over 6 years ago

0 Kedar Manishankar over 6 years ago

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 Viktorija Cecil over 6 years ago in reply to Kedar Manishankar

TI__Mastermind 18471 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 Kedar Manishankar over 6 years ago 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.

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BQ24640: a power backup to a magnetic latch