Electric energy meter

A technology of electric energy meter and voltage channel, which is applied in the field of electric energy meter, can solve the problems of electric energy meter structure complexity and measurement accuracy, and achieve the effect of improving measurement accuracy

Active Publication Date: 2012-07-11
HI TREND TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to provide an electric energy meter, which is used to solve the problems of the structure complexity and / or measurement accuracy of the electric energy meter in the prior art

Method used

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Examples

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Effect test

no. 1 example

[0042] See figure 2 , shows the circuit structure diagram of the electric energy meter in the first embodiment of the present invention.

[0043] like figure 2 As shown, the electric energy meter includes: a voltage channel analog-to-digital conversion unit, a current channel analog-to-digital conversion unit, and a power calculation circuit. The voltage channel analog-to-digital conversion unit further includes: a voltage channel modulator 11, a low-pass filter 12, a high-pass filter 13, and a first clock generation unit, the first clock generation unit includes a first two-phase non-overlapping A clock generator 141 , a first pseudo-random sequence generator 142 and a second two-phase non-overlapping clock generator 143 . The current channel analog-to-digital conversion unit further includes: a current channel modulator 21, a low-pass filter 22, a high-pass filter 23, and a second clock generation unit, including: the second clock generation unit includes a third two-pha...

no. 2 example

[0066] See Figure 10, shows the circuit structure diagram of the electric energy meter in the second embodiment of the present invention.

[0067] like Figure 10 As shown, the electric energy meter includes: a voltage channel analog-to-digital conversion unit, a current channel analog-to-digital conversion unit, and a power calculation circuit. The voltage channel analog-to-digital conversion unit further includes: a voltage channel modulator 11, a low-pass filter 12, a high-pass filter 13, and a first clock generation unit. The current channel analog-to-digital conversion unit further includes: a current channel modulator 21 , a low-pass filter 22 , a high-pass filter 23 , and a second clock generation unit.

[0068] In the first embodiment, two different pseudo-random sequence generators are provided; in contrast, in the second embodiment, only one pseudo-random sequence generator is provided.

[0069] Specifically, in the second embodiment, the first clock generation u...

no. 3 example

[0072] See Figure 11 , shows the circuit structure diagram of the electric energy meter in the third embodiment of the present invention.

[0073] like Figure 11 As shown, the electric energy meter includes: a voltage channel analog-to-digital conversion unit, a current channel analog-to-digital conversion unit, and a power calculation circuit. The voltage channel analog-to-digital conversion unit further includes: a voltage channel modulator 11, a low-pass filter 12, a high-pass filter 13, and a first clock generation unit. The current channel analog-to-digital conversion unit further includes: a current channel modulator, a low-pass filter 22, a high-pass filter 23, and a second clock generation unit.

[0074] In the first embodiment, two different pseudo-random sequence generators are provided; in contrast, in the third embodiment, only one pseudo-random sequence generator is provided.

[0075] Specifically, in the third embodiment, the first clock generating unit incl...

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Abstract

The invention provides an electric energy meter, which comprises a voltage channel analog-to-digital conversion unit, a current channel analog-to-digital conversion unit, a power calculation circuit, a first clock generation unit and a second clock generation unit, wherein the voltage channel analog-to-digital conversion unit is provided with a voltage channel modulator, a low-pass filter and a high-pass filter; the current channel analog-to-digital conversion unit is provided with a current channel modulator, a low-pass filter and a high-pass filter; the power calculation circuit is provided with a multiplying unit and a low-pass filter; the first clock generation unit is used for providing two non-overlapped sampling clock pulses and two non-overlapped chopping clock pulses for the voltage channel modulator; and the second clock generation unit is used for providing two non-overlapped sampling clock pulses and two non-overlapped chopping clock pulses for the current channel modulator. Compared with the prior art, according to the electric energy meter provided by the invention, as the two chopping clock pulses provided for the voltage channel modulator and the current channel modulator are not related basically, the relativity of idle noise in the voltage channel modulator and the current channel modulator is reduced, and thereby, the measuring accuracy of the electric energy meter can be increased.

Description

technical field [0001] The invention relates to an electric energy meter capable of realizing high-precision measurement. Background technique [0002] In daily life, every family uses an electric energy meter, which is a tool for calculating electric energy consumption. According to the principle, electric energy meters can be divided into two categories: inductive and electronic. With the continuous development of the smart grid, the high-speed, two-way, real-time, integrated grid communication system has matured, and the application of smart energy meters is becoming more and more extensive. The electronic energy meter uses an analog-to-digital converter to convert the voltage value and current value into corresponding digital values, and then uses a digital circuit to realize the energy metering function. Driven by the smart grid that is popular all over the world, how to improve the measurement accuracy of smart energy meters has become a common goal in the energy mea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R22/10
Inventor 朱传森萧经华佘龙
Owner HI TREND TECH SHANGHAI
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