Hello Forum,
i have a circuit which indicates when the charging current exceeds certain amperes, in my case 6 amps, i have used a 0.01 ohm current sense resistor in the negative of the battery and iam measuring the voltage developed across the sense resistor.
if the voltage across this resistor is 60 millivolts i know that 6 amps current is flowing thru the battery. an op-amp is used as a comparator to compare the voltage of sense resistor with a reference voltage of 60 mV.
but the circuit is not operating as i intended, even when the voltage across the sense resistor is beyond Vref (60mV) the output of the op-amp doesn't change state (ideally it should swing to 1 volt or so but stays at 3.81 V)
i don't know where the error is
Thank you
nura
i have a circuit which indicates when the charging current exceeds certain amperes, in my case 6 amps, i have used a 0.01 ohm current sense resistor in the negative of the battery and iam measuring the voltage developed across the sense resistor.
if the voltage across this resistor is 60 millivolts i know that 6 amps current is flowing thru the battery. an op-amp is used as a comparator to compare the voltage of sense resistor with a reference voltage of 60 mV.
but the circuit is not operating as i intended, even when the voltage across the sense resistor is beyond Vref (60mV) the output of the op-amp doesn't change state (ideally it should swing to 1 volt or so but stays at 3.81 V)
i don't know where the error is
Thank you
nura