GB2199411A - Auto compensating alternating current meter - Google Patents

Auto compensating alternating current meter Download PDF

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Publication number
GB2199411A
GB2199411A GB08629215A GB8629215A GB2199411A GB 2199411 A GB2199411 A GB 2199411A GB 08629215 A GB08629215 A GB 08629215A GB 8629215 A GB8629215 A GB 8629215A GB 2199411 A GB2199411 A GB 2199411A
Authority
GB
United Kingdom
Prior art keywords
alternating current
current meter
solid state
auto
auto compensating
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.)
Pending
Application number
GB08629215A
Other versions
GB8629215D0 (en
Inventor
A J Wilks
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.)
OMEGA ELECTRIC Ltd
Original Assignee
OMEGA ELECTRIC Ltd
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 OMEGA ELECTRIC Ltd filed Critical OMEGA ELECTRIC Ltd
Priority to GB08629215A priority Critical patent/GB2199411A/en
Publication of GB8629215D0 publication Critical patent/GB8629215D0/en
Publication of GB2199411A publication Critical patent/GB2199411A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • 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
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/207—Constructional details independent of the type of device used
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/32—Compensating for temperature change
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/08—Arrangements for measuring electric power or power factor by using galvanomagnetic-effect devices, e.g. Hall-effect devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/14—Compensating for temperature change

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

A solid alternating current meter with e.g. a Hall or magnetoresistor sensor (1) is self compensating for long term stability and does not require potentiometer adjustments to remove offset conditions. An auto-compensation feedback amplifier (10) cures drift with aid of a capacitor (11) and resistor (12) having a long time constant. <IMAGE>

Description

DESCRIPTION AUTO COMPENSATING SOLID STATE ALTERNATING CURRENT METER This invention relates to an alternating current meter which is self compensating for long term stability.
Alternating current meters such as electricity meters are widely used in consumer supply lines to monitor power consumption and generally consist of rotating parts driven by induced magnetic fields, or solid state current sensing devices with precision amplifiers with temperature compensation and a number of adjustment potentiometers to allow setting up. The rotating parts in the former case cause wear and create errors and in the latter type temperature variations cause problems as do components ageing and changing value.
According to the present inventions a solid state alternating current meter can be made which is not subject to temperature and ageing problems, neither does it require any potentiometers to remove offsets about the zero current position.
A specific example will now be described with reference to the accompanying drawings.
Figure 1 shows a solid state device such as is commonly available positional to measure current in an A.C. line.
Figure 2 shows a solid state device such as is commonly available in circuit diagram form.
Figure 3 shows such a device with an external amplifier.
Figure 4 shows such a device with an auto compensation amplifier system.
Referring to Figure 1 the solid state device (1) is inserted into the magnetic field (2) of a coil (3) which is of negligible impedance so as to provide a measure of flux which in turn provides a measure of current flowing in the coil and the load (4). The current is generated by the alternating power source (5).
Referring to Figure 2 a typical solid state device (1) consists of a hall effect element (6) with some compensation for sensitivity changes with temperatures giving it two differential outputs (7).
Another suitable solid state device is a magneto resistor together with compensation for sensitivity changes with temperature.
Referring to Figure 3 the output of solid state device (1) is applied to a standard differential amplifier (8) which requires an offset trimming potentiometer (9) to remove any D.C. offset conditions.
However any changes in offset due to temperature variations and ageing will not be accounted for.
Referring to Figure 4 the addition of an auto compensating amplifier (10) cures the drift problems associated with Figure 3.
The time constant of capacitor (11) and resistor (12) is -made long with respect to the sinusoidal supply frequency generating the measured current. The auto compensating amplifier (10) will not attenuate the output signal of the differential amplifier (8). However all D.C. components at the output of the differential amplifier (8) will be removed, hence slow changes due to temperature and ageing of components will have no effect.
Another benefit is that D.C. offsets in the output of the solid state device (1) will be removed without the requirement for a potentiometer. The output signal summed value will always be zero.

Claims (3)

1. A solid state alternating current meter with automatic compensation for long term changes due to ageing and temperature changes.
2. A solid state alternating current meter as in Claim 1 based upon a hall effect sensor.
3. A solid state meter as in Claim 1 based upon a magneto resistor sensor.
GB08629215A 1986-12-06 1986-12-06 Auto compensating alternating current meter Pending GB2199411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08629215A GB2199411A (en) 1986-12-06 1986-12-06 Auto compensating alternating current meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08629215A GB2199411A (en) 1986-12-06 1986-12-06 Auto compensating alternating current meter

Publications (2)

Publication Number Publication Date
GB8629215D0 GB8629215D0 (en) 1987-01-14
GB2199411A true GB2199411A (en) 1988-07-06

Family

ID=10608581

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08629215A Pending GB2199411A (en) 1986-12-06 1986-12-06 Auto compensating alternating current meter

Country Status (1)

Country Link
GB (1) GB2199411A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2646919A1 (en) * 1989-04-05 1990-11-16 Mitsubishi Electric Corp
EP0601817A1 (en) * 1992-12-11 1994-06-15 Kabushiki Kaisha Toshiba Power multiplication circuit
EP2871486A4 (en) * 2012-07-06 2016-03-16 Alps Green Devices Co Ltd Method for manufacturing current sensor, and current sensor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4217546A (en) * 1978-12-11 1980-08-12 General Electric Company Electronic energy consumption meter and system with automatic error correction
GB1603650A (en) * 1978-05-15 1981-11-25 Enertec Electronic circuits for producing an output signal related to the integral of the product of two input signals
GB2076975A (en) * 1980-06-04 1981-12-09 Tokyo Shibaura Electric Co Electronic watthour meter
US4514685A (en) * 1981-07-27 1985-04-30 Electric Power Research Institute, Inc. Integrating circuit for use with Hall effect sensors having offset compensation means
US4535287A (en) * 1983-03-25 1985-08-13 General Electric Company Electronic watt/watthour meter with automatic error correction and high frequency digital output
EP0163460A1 (en) * 1984-05-18 1985-12-04 Pilkington Brothers P.L.C. A system for measuring the electrical consumption of a load
GB2169083A (en) * 1984-12-20 1986-07-02 Nukem Gmbh A circuit arrangement for compensating the ohmic zero voltage of hall generators

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1603650A (en) * 1978-05-15 1981-11-25 Enertec Electronic circuits for producing an output signal related to the integral of the product of two input signals
US4217546A (en) * 1978-12-11 1980-08-12 General Electric Company Electronic energy consumption meter and system with automatic error correction
GB2076975A (en) * 1980-06-04 1981-12-09 Tokyo Shibaura Electric Co Electronic watthour meter
US4514685A (en) * 1981-07-27 1985-04-30 Electric Power Research Institute, Inc. Integrating circuit for use with Hall effect sensors having offset compensation means
US4535287A (en) * 1983-03-25 1985-08-13 General Electric Company Electronic watt/watthour meter with automatic error correction and high frequency digital output
EP0163460A1 (en) * 1984-05-18 1985-12-04 Pilkington Brothers P.L.C. A system for measuring the electrical consumption of a load
GB2169083A (en) * 1984-12-20 1986-07-02 Nukem Gmbh A circuit arrangement for compensating the ohmic zero voltage of hall generators

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
WO 85/00711 *
WO 85/00894 *
WO 86/03301 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2646919A1 (en) * 1989-04-05 1990-11-16 Mitsubishi Electric Corp
US5159561A (en) * 1989-04-05 1992-10-27 Mitsubishi Denki Kabushiki Kaisha Zero-phase sequence current detector
EP0601817A1 (en) * 1992-12-11 1994-06-15 Kabushiki Kaisha Toshiba Power multiplication circuit
US5438258A (en) * 1992-12-11 1995-08-01 Kabushiki Kaisha Toshiba Power multiplication circuit which reduces an offset voltage of a Hall element to zero
EP2871486A4 (en) * 2012-07-06 2016-03-16 Alps Green Devices Co Ltd Method for manufacturing current sensor, and current sensor

Also Published As

Publication number Publication date
GB8629215D0 (en) 1987-01-14

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