Hi Guys,
Hope you are staying safe.
I have two questions regarding attached schematic
1. Battery Mode : Opamp will measure DC load current at R7 and 9V charger is not connected
2. Charging mode : DC load will be disconnected and opamp will measure the charging current of battery
Now i want to understand attached differential amplifier circuit.
For case 1 : Opamp output = (R6/R5) * (V+ - V-)
so this correct because V+ is always greater than V- hence Vout opamp is +Ve
For case 2 : Opamp output = (R6/R5) * (V+ - V-)
In this case V+ is less than V- hence Vout opamp is -Ve. Since opamp is at GND level so Vout opamp is 0V
I have a doubts on case 2 and may be my understanding on case 1 is correct.
Could anybody clarify on above two points.
Note : Attached two circuit are combined for for DC load current measurement and Battery charging current measurement. When battery is in charging mode DC load will off and hence opamp will measure battery charging current. When battery is charged and charger come out and DC load works with battery only so opamp will now measure DC load current.
For simulation purpose i have created two circuit
Best Regards,
Hope you are staying safe.
I have two questions regarding attached schematic
1. Battery Mode : Opamp will measure DC load current at R7 and 9V charger is not connected
2. Charging mode : DC load will be disconnected and opamp will measure the charging current of battery
Now i want to understand attached differential amplifier circuit.
For case 1 : Opamp output = (R6/R5) * (V+ - V-)
so this correct because V+ is always greater than V- hence Vout opamp is +Ve
For case 2 : Opamp output = (R6/R5) * (V+ - V-)
In this case V+ is less than V- hence Vout opamp is -Ve. Since opamp is at GND level so Vout opamp is 0V
I have a doubts on case 2 and may be my understanding on case 1 is correct.
Could anybody clarify on above two points.
Note : Attached two circuit are combined for for DC load current measurement and Battery charging current measurement. When battery is in charging mode DC load will off and hence opamp will measure battery charging current. When battery is charged and charger come out and DC load works with battery only so opamp will now measure DC load current.
For simulation purpose i have created two circuit
Best Regards,
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