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Lipo Battery Auto Cut Off

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Something I've been looking at since I undervoltaged one of my LiPo batteries is an auto cut off circuit when it get's below around 6.2v

I think this will do it but could do with some confirmation since this is not my area of expertise so am always concerned. Any comments and suggestions would be extremely appreciated.

If it is OK you can expect to see this replaced with a tutorial:)

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Zener Diode is rated for 6.2V Mosfet is rated at 85A

I realise a small load may pass through R1 when shut off but I assume it will be so small it will not matter (unless left for a very long period)

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#17  

Hey guys, I am Alex and I am quite new to electronics. I am building a micro quadcopter on the base of some chinese no-name board that does not have lipo cut-off. I am flying 1s lipos and I have already ruined one. My aim is to create the smallest possible lipo auto cut-off. I searched web for quite a while and was not able to find a solution. Could you help me with this one please? THANKS!

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#18  

Probably should add, I dont know exact power drain, but the battery is 600mAh 1s

Great Britain
#21  

Hi Steve, yes it is exactly what I need, I just to make it even smaller!

#22  

I've been looking for a similar circuit (hence me running across this thread)

The basic idea is sound... in fact it is similar to the under-voltage lockout circuit design shown in TI's datasheet for the LM2576.

But it needs some type of Schottky trigger. Otherwise, the battery bouce-back voltage (after the load is removed) will cause the voltage at the Gate to turn it back on. Let, it's my understanding that it will just ripple until it dies.

I haven't found the right solution yet.

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