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Help in current sensing from a circuit..

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Thread Starter

krishnaagarwala

Joined Apr 7, 2010
5
I have uploaded a schematic of the project based on MPPT of a solar panel.

Plz note that the solar panel I would be using has maximum voltage output of about 22V(around 17V at normal working conditions) and current range is maximum 4A(generally 1.5-2A at normal working conditions).
I need to sense the current from the circuit to be fed to AD633/MPY634(analog multiplier http://focus.ti.com/lit/ds/symlink/mpy634.pdfhttp://www.ti.com/lit/gpn/mpy634 ) for power calculation.

I dont know how to do it...plz help.
 

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nsaspook

nsaspook

Joined Aug 27, 2009
13,265
krishnaagarwala said:
I have uploaded a schematic of the project based on MPPT of a solar panel.

Plz note that the solar panel I would be using has maximum voltage output of about 22V(around 17V at normal working conditions) and current range is maximum 4A(generally 1.5-2A at normal working conditions).
I need to sense the current from the circuit to be fed to AD633/MPY634(analog multiplier http://focus.ti.com/lit/ds/symlink/mpy634.pdf ) for power calculation.

I dont know how to do it...plz help.
Click to expand...
It looks like the current sense circuit in your diagram is from the ground shunt from the solar cell. On the AD633 inputs, the top opamp is buffering the voltage of the panel and the bottom opamp is buffering the shunt voltage. The AD633 is sending a power signal. So your current signal is the output of the bottom amp where it feed the multiplier.
 
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