Volt-ampere-hour meter using a digital signal processor
Komatsu, M.
Kobayashi, T.
Wada, S.
Nakamura, H.
NEC Corp., Kawasaki;
This paper appears in: Circuits and Systems, 1989., IEEE International Symposium on
Publication Date: 8-11 May 1989
On page(s): 2068-2071 vol.3
Meeting Date: 05/08/1989 - 05/11/1989
Location: Portland, OR, USA
References Cited: 1
INSPEC Accession Number: 3649570
Digital Object Identifier: 10.1109/ISCAS.1989.100781
Current Version Published: 2002-08-06
Abstract
An active and reactive volt-ampere-hour meter that consists of
12-b analog-to-digital converters and a digital signal processor has
been developed. The meter has digital offset canceling filters and
digital 90°-phaser-difference filters. The canceling filters cancel
offset in the sample-and-hold circuits and in the analog-to-digital
converters. Using the phase-difference filters, the meter is able to
measure reactive volt-ampere-hour value, not only for the fundamental
frequency but also for several orders of harmonics. The voltage and
current noise is canceled by the time-domain integrals. Using a digital
signal processor, it is possible to realize a smaller size and lower
power consumption than for a conventional volt-ampere-hour meter. Highly
accurate results were obtained by computer simulation and for a
breadboard mockup construction
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