How to get a battery auto cut its current when its voltage decreases to safe level?

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Nicholas

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I m using a RECHARGEABLE battery to power a circuit during Mains power failure.
So, is there any way to get the battery self cut down its current when its voltage down to a safe level?
Thanks
 

low battery cutoff circuit

If I understand correctly, you would like to cut-off your battery when the battery riches certain voltage level (you called it safe level).
In this case you can use low current op-amp or comparator as comparator and a P-channel Mosfet as switch.
If voltage drops below this level the P-channel will be switched off..
Is this what whould you like to do?
 

an almost-ideal low-battery cut-off circuit

There is a schematic on low-battery cut-off circuit in this article:

An Almost Ideal Low-Battery Cutoff Circuit Draws Only 1.2 μA
**broken link removed**


By the way:
rauol ( ) said:
Because your circuit is a battery powered unit you cant use normal comparators which will drain lot of power. You can use low power CMOS comparator to detect undervoltage.
Click to expand...

Also, you may find many circuits/projects on battery monitor, management, charger, etc. in Circuit Celler Magazine , which you can download them FREE from this board at .

Here is another related project:
NE555 Low Voltage Battery Disconnect Circuit
**broken link removed**

Hope they help.
 
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    Nicholas

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battery low voltage cut off prject

Hello,
From what you describe, I believe you need a Low Voltage Battery Disconnect circuit.
If you performe a search in Google with the above 4 words, you will find a lot of circuits.
Try also the following url **broken link removed**

You might find some other useful circuits and data there.
Regards
Platonas
 
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simple low battery cutoff circuit

you only need a "UNDERVOLTAGE SENSING CIRCUIT". so you could use an IC like MC34064. if you check the spec sheet, you could find the needed circuit.
 

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