We're working on grid tie inverter & using AMC1304L05 for grid voltage & current measurement. We're seeing frequent failures of the device on grid voltage side. We're maintaining < 50mV at the AinP & AinN inputs @ 300Vac. Fig1. shows the schematics of voltage measurement. Fig 2. shows how we're tapping the AC input, also we're using AC side bias power supply using MAX5070.
Fig 1. Grid voltage measurement
Fig 2. Grid Input
We're facing following issues:
1. The measured Grid Voltage spikes after sometime even when the grid input is stable (eg. it spikes to 280V & settle downs to 230V).
2. Randomly the device AMC1304 fails.
Need help in resolving the issue.
Thanks in advance.