What is the function of this op amp circuit?

普拉卡图

What is the function of this op amp circuit? [Copy link]

As shown in the figure, the intuition of this circuit is to collect the total current flowing through the battery.

Use a 20mR resistor to convert the collected current into voltage.

The final amplified output to the AD port of the microcontroller should be.

The collected voltage is reversely amplified above.

One is enlarged in the same direction below,

What is the function of this circuit, and how is the amplification factor calculated?

Please help me answer this question, thank you!

呜呼哀哉

Is it valuable? For an op amp powered by a single power supply and without DC bias at the input, do you expect pin 1 to output negative voltage?

Gen_X

Since this is a VBAT measurement, there are two directions:

IO1 is used to measure the discharge current.

IO2 is the charging current.

The measurement of the current of this unit is quite interesting.

中央上

Gen_X published on 2024-9-23 09:25 Since this is a VBAT measurement, there are two directions: IO1 is used to measure the discharge current, and IO2 is the charge current. This single...

Analog electronics is the devil

Gen_X

Central News Published on 2024-9-25 21:13 Analog electronics is the devil

Totally agree!

There are many things that cannot even be explained by theory, and rely on "fog, misunderstanding ==》enlightenment"!

普拉卡图

Gen_X posted on 2024-9-23 09:25 Since this is a VBAT measurement, there are two directions: IO1 is used to measure the discharge current, and IO2 is the charge current. This single...

This means that the two op amps detect the charging and discharging currents respectively.