Patent ID: 9185760
Filing Date: 2015-11-10
Classification: G01R,H02M,H05B

Abstract:
1. A method comprising: receiving a waveform; rectifying the waveform to generate a rectified waveform; comparing the rectified waveform with a first voltage to generate a first compare signal, wherein a first edge of the first compare signal occurs at a first time when an instantaneous value of the rectified waveform becomes higher than the first voltage; comparing the rectified waveform with a second voltage to generate a second compare signal, wherein a first edge of the second compare signal occurs at a second time when the instantaneous value of the rectified waveform becomes higher than the second voltage; and based at least in part on the first time and the second time, estimating a voltage of the waveform, wherein the first voltage is a direct current (DC) voltage having a first positive value, wherein the second voltage is a DC voltage having a second positive value, and wherein the first positive value is different from the second positive value.