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Electric power meter

A meter, electric power technology, applied in the direction of electric power measurement by applying digital technology, measurement of electric variables, electric power measurement by current/voltage, etc., can solve the problem that the components that adjust the sampling time are no longer effective.

Inactive Publication Date: 2009-02-18
ACTARIS UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So, in case of such a phase shift change, the means for adjusting the sampling time may no longer be effective

Method used

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  • Electric power meter

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Embodiment Construction

[0026] Figure 1 schematically shows a meter 1 according to the invention.

[0027] Typically, the meter 1 is operatively connected to a power consumer, not shown, such as a power line load 2 of a residential or industrial establishment.

[0028] The meter 1 includes:

[0029] current sensor 3,

[0030] voltage sensor 4,

[0031] voltage level adjustment component 5,

[0032] current level adjustment component 6,

[0033] Voltage zero-crossing detection circuit 12,

[0034] Current zero-crossing detection circuit 13,

[0035] microcontroller7.

[0036] The microcontroller 7 includes:

[0037] Analog-to-digital A / D converter 8, comprising,

[0038] phase adjustment timer 9 with compare register,

[0039] input selector 10,

[0040] A module 14 with an interrupt input,

[0041] Phase shift measuring device 15,

[0042] Calibration control device 18,

[0043] Sample Timer 19,

[0044] multiplier 16,

[0045] Integrator 17.

[0046] The voltage sensor 4 is connected...

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Abstract

The present invention relates to the field of electrical power meter utilizing digital signal processing in order to provide the consumption of electrical energy by integration of said electrical power. Said meter (1) comprises a voltage sensor (4), a current sensor (3), an analogue to digital converter (8) including first sampling means for generating a first voltage sample at a first sampling time and second sampling means for generating a first current sample at a second sampling time. Said meter further comprises phase compensation means (9) for compensating phase shifts between said analogue voltage and current signals by adjusting said second sampling time compared to said first sampling time in order to provide said first voltage sample and said first current sample substantially in phase, means (6,12 and 13) for saturating said voltage and current analog signals in order to produce voltage and current substantially square waves and means (15) for evaluating said shifting of sampling time by taking the differences between the zero crossing time of said current square wave and the zero crossing time of said voltage square wave. <IMAGE>

Description

technical field [0001] The invention relates to the field of electric power meters which use digital signal processing to provide an electric energy consumption by integrating said electric power. Background technique [0002] Electrical utility meters are known to provide electrical utility meters that allow the electrical energy consumed by equipment to be measured. Such meters convert analog signals proportional to current and voltage in the power line being metered into digital signals for digital signal processing. Such a conversion step is provided by an analog-to-digital converter. This digital signal can then be easily multiplied and the product provides electrical power. The electrical power is then supplied to an accumulator which generates pulses proportional to the power used on the power line being metered. [0003] One problem encountered with such known energy meters is that the accuracy of the meter requires the voltage and current signals to be in the cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R21/133G01R21/06G01R22/10G01R25/04
CPCG01R25/04G01R21/133G01R21/06G01R22/10G01R35/04
Inventor 斯科特·布朗陈春
Owner ACTARIS UK LTD