epp
Full Member level 5
Hi!
I need to measure three phase AC voltages (~230VAC, 50Hz) in order to
control AC motor. I have to use resistor divider plus some OpAmp and RC filter
in order to scale and isolate that voltages which will be connected at input of an ADC
(in dsPIC controller).
How should I connect resistors and OpAmp? Please draw it.
I want these values at input of an ADC (0-5V):
-230VAC --> 0V
0VAC --> 2.5V
+230VAC --> 5V
I need to measure three phase AC voltages (~230VAC, 50Hz) in order to
control AC motor. I have to use resistor divider plus some OpAmp and RC filter
in order to scale and isolate that voltages which will be connected at input of an ADC
(in dsPIC controller).
How should I connect resistors and OpAmp? Please draw it.
I want these values at input of an ADC (0-5V):
-230VAC --> 0V
0VAC --> 2.5V
+230VAC --> 5V