US 7,548,223 B2 · Reduced cost automatic meter reading system and method using locally communicating utility meters

Abstract

A low cost and easy to assemble communicating utility meter provides selectable measurement, calibration, display, and communications means so as to be re-configurable based on several factors including; harmonic content of the power signal measured, LCD display alternatives, time of use measurements, bandpass filter settings, power quality measurements, PLC communications. alternatives, radio frequency communications alternatives, optical communications alternatives, and hard wire communications alternatives.

Claims5

Dependent claims

A circuit for filtering a current sensor signal comprising a second order infinite impulse response (IIR) filter, said IIR filter having a z domain response defined by:

H
⁡
(
z
)
=
c
⁡
(
z
2
-
1
)
z
2
-
2
⁢
k
+
k
^
2
,
wherein c is a normalization constant, and wherein k is approximately equal to 1, and wherein {circumflex over (k)} is approximately equal to k.

23 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/913,100Filed 6 Aug 2004

Published

US 2005/0024234 A13 Feb 2005

Granted

16 Jun 2009

Term ends

Not estimatedThe source records don’t support an estimate.

Classification15 codes

H04Q 9/00
Arrangements in telecontrol or telemetry systems for selectively calling a substation from
G01D 4/004
Remote reading of utility meters: remote reading of utility meters to a fixed location
G01R 22/00
Arrangements for measuring time integral of electric power or current
G01R 21/133
Arrangements for measuring electric power or power factor: by using digital technique

Reduced cost automatic meter reading system and method using locally communicating utility meters

Life of this patent

Reduced cost automatic meter reading system and method using locally communicating utility meters

Life of this patent

Abstract

Claims5