Zero line current sampling circuit and electric energy meter

A technology of sampling circuit and neutral current, applied in the direction of measuring current/voltage, measuring current only, voltage/current isolation, etc., can solve problems such as increasing the cost of electric energy meters, increasing physical space, and affecting the miniaturization design of electric energy meter products. , to achieve the effect of reducing costs and reducing physical space

Pending Publication Date: 2022-05-10
CLOU GLOBAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method will not only increase the occupied physical space, affect the miniaturization design of the electric energy meter product, but also increase the cost of the electric energy meter

Method used

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  • Zero line current sampling circuit and electric energy meter
  • Zero line current sampling circuit and electric energy meter
  • Zero line current sampling circuit and electric energy meter

Examples

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Embodiment Construction

[0051] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0052] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific ...

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Abstract

The invention discloses a zero line current sampling circuit and an electric energy meter. The zero line current sampling circuit comprises a first mutual inductor, a first sampling unit and a second sampling unit. The first mutual inductor is electrically connected with a zero line power supply and a ground end respectively; the first sampling unit is used for being electrically connected with the first mutual inductor and the main control module, and the first sampling unit is used for generating a first zero line signal; the second sampling unit is used for being electrically connected with the first mutual inductor and the main control module, the second sampling unit is connected with the first sampling unit in parallel, and the second sampling unit is used for generating a second zero line signal; wherein the main control module is used for carrying out current bypass detection according to the three-phase current and the first null line signal, and the main control module is used for carrying out null line falling detection according to the second null line signal. According to the zero line current sampling circuit, under the condition that only one current transformer is used, current bypass detection and zero line falling detection can be carried out on the electric energy meter at the same time.

Description

technical field [0001] The invention relates to the technical field of current sampling, in particular to a zero line current sampling circuit and an electric energy meter. Background technique [0002] Current bypass refers to the use of wires in the energy meter to short-circuit the input and output terminals of a certain phase of the energy meter. In related technologies, the current bypass can reduce the current detected by the energy meter. Therefore, there is an operation of stealing electricity through the current bypass in real life. It can be seen that, through the current bypass detection, it is possible to monitor whether the electric energy meter is bypassed by the current, so as to prevent electricity theft. [0003] Zero line detection refers to the inspection operation of monitoring whether the zero line failure occurs in the power grid, and is used to prevent the burning of electrical appliances caused by the zero line failure. [0004] In related technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/18G01R19/00G01R22/06G01R31/54G01R31/58G01R1/30
CPCG01R15/18G01R19/0092G01R22/066G01R31/54G01R31/58G01R1/30
Inventor 廖子桂冯涛黄保柱邹可树
Owner CLOU GLOBAL TECH CO LTD
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