TIDUBE5A January 2022 – October 2022
The AC voltage sensing circuit is used to convert the grid voltage signal into low voltage signal, and then to condition these sensed signals to meet the requirements of the ADC input port. The line and the neutral voltages are sensed by resistor divider to the ground of the board as shown in Figure 2-2. The two signals are subtracted by the amplifier to the ADC input port to get the Vac sensing value.