Adaptive online filter for DC offset elimination

Patent metadata

Field	Value
Publication number	US-8964427-B2
Application number	US-201213537993-A
Country	US
Kind code	B2
Filing date	Jun 29, 2012
Priority date	Jun 29, 2012
Publication date	Feb 24, 2015
Grant date	Feb 24, 2015

Abstract

A phase angle detector with a PLL, a power converter, and a method for reducing offsets in an input signal, in which an adaptive offset processor selectively removes a DC offset component from the input signal to generate a modified signal including a fundamental frequency component and higher order harmonics of the input signal with the DC offset component removed, and the PLL provides a phase angle signal at least partially according to the modified signal.

First claim

The following is claimed:

1. An adaptive offset processing apparatus, comprising:
an adaptive tracking filter having an adaptive passband defined by a frequency signal, the tracking filter being operative to remove substantially all frequency components of an input signal that are outside the passband to generate a fundamental frequency signal;
a first summer operatively coupled with the adaptive tracking filter to subtract the fundamental frequency signal from the input signal…

Assignees

• Kerkman Russel J
• Mohamed Sayed Ahmed Ahmed
• Seibel Brian J
• Rockwell Automation Tech Inc

Inventors

• Kerkman Russel J
• Mohamed Sayed Ahmed Ahmed
• Seibel Brian J

Classifications

• H03F1/565 Primary

  Electricity · mapped topic

• H02M1/4233

  Electricity · mapped topic

• H03H11/04

  Electricity · mapped topic

• H03H7/38

  Electricity · mapped topic

• Y02B70/10

  Cross-Sectional Technologies · mapped topic