CA2148961A1 - Linear Alternating Current Interface for Electronic Meters - Google Patents

Linear Alternating Current Interface for Electronic Meters

Info

Publication number
CA2148961A1
CA2148961A1 CA2148961A CA2148961A CA2148961A1 CA 2148961 A1 CA2148961 A1 CA 2148961A1 CA 2148961 A CA2148961 A CA 2148961A CA 2148961 A CA2148961 A CA 2148961A CA 2148961 A1 CA2148961 A1 CA 2148961A1
Authority
CA
Canada
Prior art keywords
transformer
coil
amplifier
winding
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2148961A
Other languages
French (fr)
Other versions
CA2148961C (en
Inventor
Sioe T. Mak
Brian C. Ramey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aclara Technologies LLC
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2148961A1 publication Critical patent/CA2148961A1/en
Application granted granted Critical
Publication of CA2148961C publication Critical patent/CA2148961C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers

Abstract

An interface circuit (10) for use with electronic metering equipment (E) to provide a linear output response to an AC or analog input. An air core transformer (12) has a first coil or winding (12a) connected to a load (L). An AC current ILOAD is produced by the load and is coupled to a secondary coil or winding (12b) of the transformer. The transformer has an air core rather than a ferromagnetic core so to have no saturable core. Because no load is drawn by transformer coil, the voltage across a terminal of the coil equals the EMF
induced in the coil The EMF, in turn, equals the mutual inductance of the coils multiplied by the rate of change of magnetic flux linkages over time. The output from the transformer is applied as an input to an operational-amplifier (16) which has a high input impedance. Further, the amplifier is a low drift amplifier which performs a linear amplification of the input signal provided thereto. In certain embodiments, a pair of similar amplifiers are used and the secondary winding of the transformer is a tapped winding so to accommodate both a low range and a separate high range of inputs. The output from the operational amplifier is supplied to an analog-to-digital converter (18) so a digital output is supplied to the metering equipment. If the tapped coil, dual amplifier arrangement is used, the resolution requirements of the converter are lower than if the single amplifier circuit configuration is used. Use of the interface circuit eliminates the DC
component of the sensed voltage and provides a linear response for the metered AC input to the measuring equipment.
CA002148961A 1994-05-13 1995-05-09 Linear alternating current interface for electronic meters Expired - Fee Related CA2148961C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US242,597 1994-05-13
US08/242,597 US5696441A (en) 1994-05-13 1994-05-13 Linear alternating current interface for electronic meters

Publications (2)

Publication Number Publication Date
CA2148961A1 true CA2148961A1 (en) 1995-11-14
CA2148961C CA2148961C (en) 1999-04-27

Family

ID=22915432

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002148961A Expired - Fee Related CA2148961C (en) 1994-05-13 1995-05-09 Linear alternating current interface for electronic meters

Country Status (2)

Country Link
US (1) US5696441A (en)
CA (1) CA2148961C (en)

Families Citing this family (80)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7364577B2 (en) 2002-02-11 2008-04-29 Sherwood Services Ag Vessel sealing system
US7137980B2 (en) 1998-10-23 2006-11-21 Sherwood Services Ag Method and system for controlling output of RF medical generator
US7901400B2 (en) 1998-10-23 2011-03-08 Covidien Ag Method and system for controlling output of RF medical generator
US6492815B2 (en) * 2000-12-22 2002-12-10 Ge Medical Systems Global Technology Company, Llc Method and apparatus for evaluating signals produced in a magnetic resonance imaging system
ATE371413T1 (en) 2002-05-06 2007-09-15 Covidien Ag BLOOD DETECTOR FOR CHECKING AN ELECTROSURGICAL UNIT
US7044948B2 (en) 2002-12-10 2006-05-16 Sherwood Services Ag Circuit for controlling arc energy from an electrosurgical generator
EP1434092A1 (en) * 2002-12-23 2004-06-30 ASML Netherlands B.V. Lithographic apparatus, device manufacturing method, and device manufactured thereby
EP1617776B1 (en) 2003-05-01 2015-09-02 Covidien AG System for programing and controlling an electrosurgical generator system
US7852185B2 (en) * 2003-05-05 2010-12-14 Intel Corporation On-die micro-transformer structures with magnetic materials
US6940396B2 (en) * 2003-05-06 2005-09-06 Distribution Control Systems, Inc. Concurrent phase communication in TWACS
WO2005050151A1 (en) 2003-10-23 2005-06-02 Sherwood Services Ag Thermocouple measurement circuit
US7396336B2 (en) 2003-10-30 2008-07-08 Sherwood Services Ag Switched resonant ultrasonic power amplifier system
US7131860B2 (en) 2003-11-20 2006-11-07 Sherwood Services Ag Connector systems for electrosurgical generator
US7766905B2 (en) 2004-02-12 2010-08-03 Covidien Ag Method and system for continuity testing of medical electrodes
US7628786B2 (en) 2004-10-13 2009-12-08 Covidien Ag Universal foot switch contact port
US7208963B2 (en) * 2004-10-29 2007-04-24 Intel Corporation Method and apparatus for measuring coil current
JP4752473B2 (en) * 2004-12-09 2011-08-17 株式会社ニコン Exposure apparatus, exposure method, and device manufacturing method
US9474564B2 (en) 2005-03-31 2016-10-25 Covidien Ag Method and system for compensating for external impedance of an energy carrying component when controlling an electrosurgical generator
US20090135382A1 (en) * 2005-04-28 2009-05-28 Nikon Corporation Exposure method, exposure apparatus, and method for producing device
US7129872B1 (en) 2005-05-25 2006-10-31 Audio Note Uk Ltd. Audio signal analog-to-digital converter utilizing a transformed-based input circuit
US8134548B2 (en) 2005-06-30 2012-03-13 Micron Technology, Inc. DC-DC converter switching transistor current measurement technique
US8734438B2 (en) 2005-10-21 2014-05-27 Covidien Ag Circuit and method for reducing stored energy in an electrosurgical generator
US7947039B2 (en) 2005-12-12 2011-05-24 Covidien Ag Laparoscopic apparatus for performing electrosurgical procedures
US7679162B2 (en) * 2005-12-19 2010-03-16 Silicon Laboratories Inc. Integrated current sensor package
US7362086B2 (en) * 2005-12-19 2008-04-22 Silicon Laboratories Inc. Integrated current sensor
US7397234B2 (en) 2005-12-19 2008-07-08 Silicon Laboratories Inc. Current sensor with reset circuit
CA2574935A1 (en) 2006-01-24 2007-07-24 Sherwood Services Ag A method and system for controlling an output of a radio-frequency medical generator having an impedance based control algorithm
US7513896B2 (en) 2006-01-24 2009-04-07 Covidien Ag Dual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling
CA2574934C (en) 2006-01-24 2015-12-29 Sherwood Services Ag System and method for closed loop monitoring of monopolar electrosurgical apparatus
US7972328B2 (en) 2006-01-24 2011-07-05 Covidien Ag System and method for tissue sealing
US9186200B2 (en) 2006-01-24 2015-11-17 Covidien Ag System and method for tissue sealing
US8685016B2 (en) 2006-01-24 2014-04-01 Covidien Ag System and method for tissue sealing
US8216223B2 (en) 2006-01-24 2012-07-10 Covidien Ag System and method for tissue sealing
US8147485B2 (en) 2006-01-24 2012-04-03 Covidien Ag System and method for tissue sealing
US7651493B2 (en) 2006-03-03 2010-01-26 Covidien Ag System and method for controlling electrosurgical snares
US7648499B2 (en) 2006-03-21 2010-01-19 Covidien Ag System and method for generating radio frequency energy
US7651492B2 (en) 2006-04-24 2010-01-26 Covidien Ag Arc based adaptive control system for an electrosurgical unit
US8753334B2 (en) 2006-05-10 2014-06-17 Covidien Ag System and method for reducing leakage current in an electrosurgical generator
US7990132B2 (en) * 2006-06-30 2011-08-02 Silicon Laboratories Inc. Current sensor including an integrated circuit die including a first and second coil
US8034049B2 (en) 2006-08-08 2011-10-11 Covidien Ag System and method for measuring initial tissue impedance
US7731717B2 (en) 2006-08-08 2010-06-08 Covidien Ag System and method for controlling RF output during tissue sealing
US8024724B2 (en) 2006-08-31 2011-09-20 Itron, Inc. Firmware download
US8312103B2 (en) 2006-08-31 2012-11-13 Itron, Inc. Periodic balanced communication node and server assignment
US7847536B2 (en) 2006-08-31 2010-12-07 Itron, Inc. Hall sensor with temperature drift control
US8049642B2 (en) 2006-09-05 2011-11-01 Itron, Inc. Load side voltage sensing for AMI metrology
US8138944B2 (en) 2006-09-15 2012-03-20 Itron, Inc. Home area networking (HAN) with handheld for diagnostics
US8212687B2 (en) 2006-09-15 2012-07-03 Itron, Inc. Load side voltage sensing for AMI metrology
US8787210B2 (en) 2006-09-15 2014-07-22 Itron, Inc. Firmware download with adaptive lost packet recovery
US8055461B2 (en) 2006-09-15 2011-11-08 Itron, Inc. Distributing metering responses for load balancing an AMR network
US9354083B2 (en) 2006-09-15 2016-05-31 Itron, Inc. Home area networking (HAN) with low power considerations for battery devices
US8059009B2 (en) 2006-09-15 2011-11-15 Itron, Inc. Uplink routing without routing table
US7843391B2 (en) 2006-09-15 2010-11-30 Itron, Inc. RF local area network antenna design
US7794457B2 (en) 2006-09-28 2010-09-14 Covidien Ag Transformer for RF voltage sensing
US8384558B2 (en) 2006-10-19 2013-02-26 Itron, Inc. Extending contact life in remote disconnect applications
US7821251B2 (en) * 2006-12-12 2010-10-26 Silicon Laboratories Inc. Current sensor
TWI340911B (en) * 2007-04-13 2011-04-21 Generalplus Technology Inc Capacitance touch sensor
US8777941B2 (en) 2007-05-10 2014-07-15 Covidien Lp Adjustable impedance electrosurgical electrodes
US7834484B2 (en) 2007-07-16 2010-11-16 Tyco Healthcare Group Lp Connection cable and method for activating a voltage-controlled generator
US8216220B2 (en) 2007-09-07 2012-07-10 Tyco Healthcare Group Lp System and method for transmission of combined data stream
US8512332B2 (en) 2007-09-21 2013-08-20 Covidien Lp Real-time arc control in electrosurgical generators
WO2009133704A1 (en) * 2008-04-30 2009-11-05 株式会社ニコン Exposure apparatus, exposure method and device manufacturing method
US7728578B2 (en) * 2008-05-15 2010-06-01 Silicon Laboratories Inc. Method and apparatus for high current measurement
US8226639B2 (en) 2008-06-10 2012-07-24 Tyco Healthcare Group Lp System and method for output control of electrosurgical generator
US8734444B2 (en) 2008-10-10 2014-05-27 Covidien Lp System and method for delivering high current to electrosurgical device
US8262652B2 (en) 2009-01-12 2012-09-11 Tyco Healthcare Group Lp Imaginary impedance process monitoring and intelligent shut-off
KR20110028712A (en) * 2009-09-14 2011-03-22 삼성전자주식회사 Voltage range decision circuit
US8685015B2 (en) * 2009-09-24 2014-04-01 Covidien Lp System and method for multi-pole phase-shifted radio frequency application
WO2012021299A1 (en) 2010-08-13 2012-02-16 Aclara Power-Line Systems Inc. Digital two way automatic communication system (twacs) outbound receiver and method
CN103348607B (en) 2010-12-02 2016-05-11 阿克拉拉技术有限责任公司 The synchronous electric line communication system of power supply and method
EP2686690B1 (en) * 2011-03-18 2017-06-14 ABB Research Ltd. Method and device for linearizing a transformer
US10200476B2 (en) 2011-10-18 2019-02-05 Itron, Inc. Traffic management and remote configuration in a gateway-based network
US9419888B2 (en) 2011-12-22 2016-08-16 Itron, Inc. Cell router failure detection in a mesh network
US10076383B2 (en) 2012-01-25 2018-09-18 Covidien Lp Electrosurgical device having a multiplexer
CN103151993B (en) * 2013-01-30 2017-06-16 国家电网公司 Accurate alternating current amplifier
US9872719B2 (en) 2013-07-24 2018-01-23 Covidien Lp Systems and methods for generating electrosurgical energy using a multistage power converter
US9636165B2 (en) 2013-07-29 2017-05-02 Covidien Lp Systems and methods for measuring tissue impedance through an electrosurgical cable
US9294147B2 (en) 2013-10-01 2016-03-22 Aclara Technologies Llc TWACS transmitter and receiver
DE102014215109A1 (en) * 2014-07-31 2016-02-04 Vacuumschmelze Gmbh & Co. Kg Flux gate current sensor with additional frequency measurement
US10833799B2 (en) 2018-05-31 2020-11-10 Itron Global Sarl Message correction and dynamic correction adjustment for communication systems
CN116593757B (en) * 2023-07-17 2023-11-03 济南巧步思仪器仪表有限公司 Alternating current ratio measuring method, system and digital alternating current comparator

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3226641A (en) * 1961-12-05 1965-12-28 Gen Electric Electronic type converter for producting a d.c. signal proportional to watt input
US4491790A (en) * 1980-02-13 1985-01-01 Westinghouse Electric Corp. Electric energy meter having a mutual inductance current transducer
US4658238A (en) * 1982-08-24 1987-04-14 Emerson Electric Co. Method and apparatus for providing selectively variable modulation signal for a carrier wave
US4918422A (en) * 1988-04-25 1990-04-17 Emerson Electric Co. Method and apparatus for extracting inbound information generated line-to-line in a multi-phase electric distribution system
US4914418A (en) * 1989-01-03 1990-04-03 Emerson Electric Co. Outbound detector system and method
YU47218B (en) * 1989-03-07 1995-01-31 Zellweger Uster Ag. STATIC ELECTRICAL NUMBER
FR2648565B1 (en) * 1989-06-16 1991-10-11 Schlumberger Ind Sa INPUT CIRCUIT FOR ELECTRICAL ENERGY METER
US4963853A (en) * 1989-10-16 1990-10-16 Emerson Electric Co. Simultaneous inbound multi-channel communication system using electricity distribution network
US4996513A (en) * 1990-02-20 1991-02-26 Emerson Electric Co. Carrier stability erasure filling system for communications over electricity distribution network
US5198796A (en) * 1991-06-27 1993-03-30 Distribution Control Systems, Inc. Outbound signal detector system and method
US5262755A (en) * 1991-12-17 1993-11-16 Distribution Control Systems, Inc. Inbound communications using electricity distribution network
US5298857A (en) * 1992-04-06 1994-03-29 Landis & Gyr Metering, Inc. Electrical energy meter with a precision integrator for current measurement

Also Published As

Publication number Publication date
CA2148961C (en) 1999-04-27
US5696441A (en) 1997-12-09

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