We provide programmed chips for UPS/Inverter applications.

Assume your output is sine. Measuring peak used to be the defacto method five or six years back. These days, everyone tracks the waveform in real time. You also need to track the mosfet/IGBT drop in real time. Both these waves are compared with the drive to correct the wave form. Without this correction, it is almost impossible to have a decent waveform, especially if you have mixed load running. Earlier, it used to be just RMS correction. These days, most of the inverters available in the market do both waveform correction and RMS correction.