hi anis,
You may have a problem finding a 15A MOSFET with VGate that will be fully On at 3V.
E

 

hi,
This is an example of Limit detector using a LM393 comparator.
E

 

What is the intent of that battery connection?

The pads marked as + and - are the charge/discharge pads.

 

No, i mean why is the output of the first opamp connected directly to the battery? What is this supposed to do for the circuit?

ak

 

hi,
This is an example of Limit detector using a LM393 comparator.
E

So the hysteresis here shows a time from 0.38s to 0.78s. where the opamp output would pulled LOW. So as the cell recovers wouldn't the opamp switch back ON, at 0.8s?

I was under the impression that the inverting pin would always invert the signal at the output, so wouldn't matter here ? wouldn't it invert a +2v8 to -2v8 ? What does R1, R3 and R6 ? I believe R2 is for hysteresis.

 

No, i mean why is the output of the first opamp connected directly to the battery? What is this supposed to do for the circuit?

ak

Its not connected to the battery its connected to a 6 pin connector.

 

hi,
You do not have a negative supply on the circuit, how can it become -2.8V.?
To have a wider switching window at the output you would decrease the feedback hysteresis resistor.

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Its not connected to the battery its connected to a 6 pin connector.

I thought SV1 was a jumper field or dip switch. oops.

ak

 

What does R1, R3 and R6 do in the simulation ?

 

What does R1, R3 and R6 do in the simulation ?

hi,
R2 and R6 are explained in Steps 2 & 3 of the Adding hysteresis PDF, I posted earlier.
R1 is partly used as a current input limit in the event of 'vr' being set to +3.3v.
As the LM393 output is a Open Collector a pull up resistor to +V is required, ie: R3

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hi,
This is an example of Limit detector using a LM393 comparator.
E

can you please share the simulation file.

 

hi a,
Here is the asc file.
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Thank you.

I get this error when opening. How can i resolve it ?

 

hi a,
Do you have a potentiometer model in your LTS files,?
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no i don't. Don't know how to get one either. Hence asked you to share hoping it would be in it.

 

OK,
Try varying Vref this way.
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Thank you.

i've managed to extend the hysteresis window of the comparator to 3v8 and followed this tutorial from sparkfun to create a potentiometer.