Hello @here, so i have been working on a high frequency pure sine wave inverter for some time now. I have an issue. That has taking me almost a month to solve but i havent gotten a lasting solution. The inverter works pretty well when it comes to heavy load or non-sensitive load. But when it comes to sensitive loads like mobile phone, it acts up. Once its connected to it to charge(ac output) the mobile phone screen freezes sometimes, other times it operates it self.
I hooked up my scope to iit, the first video is that of the grid supply, while the second video is that of my inverter output, they are both sine wave, but if you look closely, you will observe the noise at my inverter output. What i did was to solve the issue was:
1. I recalculated the LC filter at the output, using a 2.8mH inductor and a 10uf cap based on the calculation. With the intention to reduce the cut off frequency to less than 1kHz
2. I added more Electrolytic capacitors on the high violtage DC bus
3. I added a choke at the ac output also but its not helping
I am still having the issue with sensitive devices. I will appreciate if someone here who has experience building inverters or has experience with power electronics or smps. IWe could also review the PCB board that was designed and also review the code also. The goal is to reduce the EMI or noise to the barest minimum