Voltage and current sensing in power electronic converters using sigma-delta A/D conversion

authored by

A. Mertens, D. Eckardt

Abstract

This paper presents a novel approach to voltage and current measurement in power electronics using a sigma-delta A/D converter. The system converts the analog input signal into a digital stream of data. By averaging the digital data stream over a switching period of the converter, the required measurement is obtained. Harmonic distortion of the input waveform and noise caused by EMI is inherently filtered out. The analog part of the sigma-delta A/D converter is very simple and operates synchronously to a clock. This makes it possible to integrate the sigma-delta converter into a small ASIC. The stream of digital data at the output of the ASIC can be transmitted using a fibre optic link that also insulates the sensing point from control electronics, so that non-insulating sensors can be used.

External Organisation(s)

Siemens AG

Type

Conference article

Journal

Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)

Volume

2

Pages

1092-1098

No. of pages

7

ISSN

0197-2618

Publication date

1996

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Control and Systems Engineering, Industrial and Manufacturing Engineering, Electrical and Electronic Engineering