I am developing a product which requires energy measurement of two different phases. I am planning to use HLW8012 energy metering IC which has this application circuit:
In this circuit, GND is referenced to 220 VAC on 1 milliohm shunt resistor.
Since GND is referenced to 220 VAC, the circuit uses NEUTRAL line on V2P for sensing voltage.
Q1) Can I reverse these two things? - I want to use GND referenced to NEUTRAL and use LIVE (220 VAC) line on V2P for sensing voltage. (please refer to the circuit below):
Q2) As mentioned earlier, I need to measure energy on two different phases (neutral line is common for them). I want to keep total circuit size small. Can I use same power circuit to power both circuits as shown below:
Details - Power supply circuit will be non isolated type with neutral connected to GND.
Note: R8 (1K) is my shunt resistor. Actual value will be 1-2 milliohms.
Note: R17 (1K) is my shunt resistor. Actual value will be 1-2 milliohms.