Hello everyone
I am currently in the process of designing a boost converter so that it can be used for active power factor correction.
The circuit schematic is as follows:
The inductor is wound with a toroidal core and as it stands the system is able to operate under rated conditions without any circuit failure. I have now moved onto the sensory circuitry portion of my system. I am currently testing my system using a switching frequency of a 100kHz and a constant duty ratio of 30%. I am inputting an AC voltage of 180V by means of a single-phase variac. The current predicament that I am on is that my system seems to be picking up a ton of noise on the sensors itself.
The sensory topology I am using is a voltage divider (with a filter cap of 10uF connected on the low-side resistor), which will be inputted to a ACPL-7900 and then further amplified using a differential amplifier.

The maximum sensed voltage is 350V. Thus the high-side is 1Mohms and the low side is 470ohms, the filter cap added was 10uF. For the differential amplifier portion of my system I set R1 and R2 to 180kohms and R3 and R4 to 330kohms. Does anyone perhaps know how I might be able to fix this?

 

During the debugging process I increased the size of low-side voltage resistor to 10kohms, so that I could potentially narrow down the cause of this noise. What I had noticed was that the noise from my actual system is as follows:

Could someone please confirm whether or not its my actual system is causing the noise? Lastly with my physical PCB design, I did make an error in connecting up the traces.

Could this wire be the cause of all my problems? The wire is joined far away from the voltage divider that I am testing but just so that I rule out any potential causes, could there be a chance that this wire could be injecting the noise into my system?