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DC voltage small signal measuring device and method

A technology of measuring device and measuring method, applied in the directions of measuring device, measuring electricity, measuring electrical variables, etc., can solve the problem of submerged DC voltage signal, etc., and achieve the effects of suppressing power frequency interference, accurate measurement, and eliminating measurement errors

Pending Publication Date: 2021-01-12
XUJI GRP +3
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Problems solved by technology

Due to the relatively strong power frequency interference of the substation or the relatively long wiring harness connecting the sensor to the data acquisition system, the power frequency interference will be coupled to the DC voltage signal received by the data acquisition system, and the power frequency interference may even overwhelm the DC voltage signal

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  • DC voltage small signal measuring device and method
  • DC voltage small signal measuring device and method
  • DC voltage small signal measuring device and method

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0030] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. According to one embodiment of the present invention, a DC small signal measuring device is provided, figure 1 is the overall structural block diagram of the measuring device, such as figure 1 As shown, the measuring device includes: an integrating circuit, a control circuit and a switc...

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Abstract

The invention relates to a DC voltage small signal measuring device and a corresponding measuring method. Since the charging integration time of DC voltage small signal input voltage to a capacitor isintegral multiple of a power frequency period, the integration voltage of power frequency interference on the capacitor is 0 in the whole power frequency period, and the influence of the power frequency interference on a DC voltage signal can be eliminated. According to the measuring method provided by the invention, power frequency interference can be effectively suppressed, only zero calibration is needed, and measurement errors caused by gain errors of a data acquisition system can be effectively eliminated.

Description

technical field [0001] The invention relates to the technical field of DC voltage small signal measurement, in particular to a DC small signal measurement device and method. Background technique [0002] Substation equipment status monitoring needs to collect information such as ambient temperature and humidity. Some models of temperature and humidity sensors output signals as small DC voltage signals. The voltage range of common small DC voltage signals is ±5V and ±10V. Due to the relatively strong power frequency interference in the substation or the long wiring harness connecting the sensor to the data acquisition system, the power frequency interference will be coupled to the DC voltage signal received by the data acquisition system, and the power frequency interference will even drown the DC voltage signal. In order to accurately sample small DC voltage signals, it is necessary to suppress power frequency interference. Contents of the invention [0003] Based on the ...

Claims

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Application Information

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IPC IPC(8): G01R19/14G01R19/00G01R1/30
CPCG01R19/14G01R19/0084G01R1/30
Inventor 侯涛王振华王志鹏邢珊珊胡凯利宋海飞陈号胡翔宇姚艳艳朱晓军
Owner XUJI GRP
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