Patent ID: 8482334
Filing Date: 2013-07-09
Classification: G01R

Abstract:
1. An apparatus for removing a DC offset in a power meter, comprising: an analog-digital converter converting an analog signal into a digital signal; a high pass filter (HPF) removing the DC offset from the signal output from the analog-digital converter in an enabling state; a selector receiving the signal passing through the high pass filter and the signal bypassing the high pass filter and outputting any one thereof; a determination block receiving the signal output from the analog-digital converter or receiving the signal output from the selector and so determining whether the received signal is a sinusoidal signal or not; an offset calculation block calculating the DC offset to be compensated from the the digital signal inputted to the determination block or the signal output from the selector; and an offset compensation unit disposed on a path bypassing the high pass filter, compensating the DC offset value calculated from the offset calculation block in the signal output from the analog-digital converter and outputting the compensated result to the offset compensation unit.