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cutoff circuit for battery

Posted: Wed May 29, 2019 4:56 pm
by solar3000
What's a simple circuit for low voltage cut-off?
I'm thinking of several circuits. One [li-ion] 3 volt low; 4 volt high. Another with a minimum of 12 volts.

Re: cutoff circuit for battery

Posted: Thu May 30, 2019 9:40 am
by Janitor Tzap
Here's a video on a adjustable Battery Cut-off Circuit.
https://www.youtube.com/watch?v=2_fugmbnufk


Signed: Janitor Tzap

Re: cutoff circuit for battery

Posted: Thu May 30, 2019 12:25 pm
by haklesup
for the 12V application, there are tons of relay controlled modules on ebay but they consume a fair amount of current on their own especially the relay based ones. I tried to implement some in a car to power off the audio amps when running on battery if it got too low but they tend to kill the battery on their own if left parked too long.

For the low voltage applications, search digikey for "PMIC" Supervisors or power management ICs. Here is one example that can be coupled wit a FET or Relay (they offer 7 different output pin types). Dig down to the Linear App notes related to this product line and you should find some application circuits.
https://www.digikey.com/en/datasheets/a ... _6321_6322

Besides Linear Technologies, IDT, Analog and TI should also have ICs in this category as well as a bunch of smaller companies. App notes are their way of explaining how to use their products, always look for those.

Re: cutoff circuit for battery

Posted: Mon Jul 08, 2019 3:21 pm
by JimAxtell
Janitor Tzap wrote:
Thu May 30, 2019 9:40 am
Here's a video on a adjustable Battery Cut-off Circuit.
https://www.youtube.com/watch?v=2_fugmbnufk


Signed: Janitor Tzap
Thanks for the video. I will definitely use it for my personal experience.