Voltage sensing circuit using differential and isolation amplifier

Pemendra_CastNX123

Hi everyone,

I refer to design the voltage sensing circuit using the given below link

https://www.wolfspeed.com/crd-22ad12n/

In this circuit, to sense the voltage, the isolation amplifier (ACPL-C870-500E) and amplifier (MCP6031) are used.

The isolation amplifier provides optical isolation between the power circuit and the controller which increases protection. However, voltage sensing can be possible via only differential amplifier schemes. It is cost-effective and simple.

But why :-

1. People are going with both amplifiers to sense the voltage as given below image.

2. Can we use only differential amplifier to sense the voltage as given below image for the SiC devise-based product?

3. Is any other region to use an optical isolation amplifier to sense the voltage as described in the previous statement (i.e. protection)?

Please suggest what should we use for SiC-based product development.