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DC electric energy meter

A DC energy meter and current sampling technology, applied in the field of electricity meters, can solve the problems of small output dynamic range, poor stability, and high cost of DC energy meters, and achieve the effects of expanding the dynamic range, enhancing stability, and facilitating verification.

Inactive Publication Date: 2017-04-26
ZHEJIANG CHINT INSTR & METER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is that the cost of the DC electric energy meter in the prior art is high, the output dynamic range is small, and the stability is poor.

Method used

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Embodiment

[0025] This embodiment provides a DC electric energy meter, which can be used in a DC electric energy metering system, such as figure 1 As shown, it includes: a housing (not shown) and a main control module 1 and a metering module 2 arranged in the housing, where the main control module 1 can be a single-chip microcomputer, and the metering module 2 and the main control module 1 connection, and also includes a current sampling module 3 and a voltage sampling module 4 respectively connected to the metering module 2, which are respectively used to transmit corresponding sampling data to the metering module 2 for metering, specifically, the analog signal obtained by sampling can be Transfer to the metering module 2 for processing, and calculate the corresponding electric energy parameters such as voltage, current, power, etc., wherein the current sampling module 3 can be set in the housing of the DC electric energy meter, for example, the current sampling module 3 can be integrate...

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Abstract

The invention provides a DC electric energy meter, which comprises a housing, a main control module and a metering module, wherein the main control module and the metering module are arranged in the housing, and the metering module is connected with the main control module. The DC electric energy meter also comprises a current sampling module, which is connected with the metering module. The current sampling module comprises a tunnel magnetoresistive sensor used for sampling magnetic field changes caused by current signals to be measured in a power supply system, converting the magnetic field changes into voltage signals and then, transmitting the voltage signals to the metering module. According to the scheme, the tunnel magnetoresistive sensor is applied to the current sampling module for sampling current to be measured, the tunnel magnetoresistive sensor can convert the magnetic field changes caused by the current signals to be measured into the voltage signals and transmit the voltage signals to the metering module for metering, so that compared with the prior art, not only dynamic range of the DC electric energy meter is expanded and stability of the DC electric energy meter is enhanced, but also integration of the whole meter is improved; the meter is convenient to carry and verify; and material cost of the whole meter is reduced.

Description

technical field [0001] The invention relates to the field of electric meters, in particular to a direct current electric energy meter. Background technique [0002] With the promotion of new energy concepts and the development of electric vehicles, there are more and more places suitable for DC charging, such as solar power generation, communication base station power consumption, battery charging, and electric vehicle charging. These fields all involve DC power and related The measurement and statistics of parameters, as a legal measurement device for DC electric energy measurement, the DC electric energy meter has become very necessary to study its technology. [0003] However, the current DC energy meters on the market all use an external shunt as a current sampling element when the metering current exceeds 10A, and the output voltage signal is only 75mV. The entire meter has defects such as large volume, high cost, small output signal, small output dynamic range, poor s...

Claims

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Application Information

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IPC IPC(8): G01R22/08
CPCG01R22/08
Inventor 兰涛李春章梁宵寇情情
Owner ZHEJIANG CHINT INSTR & METER
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