Power quality analyzer circuit

A power quality analysis, voltage detection circuit technology, applied in the direction of measuring electrical variables, instruments, measuring devices, etc., can solve the problems of the system cannot work normally, power quality pollution, etc., to achieve good anti-interference and reliability, low power consumption , good signal consistency

Inactive Publication Date: 2018-03-06
王小义
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With a large number of sensitive loads and important load equipment connected, interference, fluctuations and characteristic changes in the power grid may make the entire system unable to work normally
At the same time, the electromagnetic interference generated during the working process of these new equipment will also be fed back to the power system to cause power quality pollution

Method used

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Embodiment Construction

[0019] The present invention will be further described below with reference to the drawings and embodiments.

[0020] Such as figure 1 , In the voltage detection circuit, the maximum input voltage U of the grid is 500V. It is hoped that the power on the large resistor RN is the smallest and the loss of the measured signal is small. It is composed of 8 200k resistors of the same model and size in parallel, which can be realized by exclusion. In order to ensure accuracy, the op amp selects AD8512, a dual-channel precision amplifier with low offset voltage, low input bias current, low input voltage noise and low input current noise. The input impedance of the op amp is large and the output impedance is small, which plays a role of isolation in this circuit. The two reversed diodes protect the op amp. Since the chip requires a stable power supply, a capacitor of 10uF and 0.1uF is connected in parallel to filter out high-frequency and low-frequency interference.

[0021] Such as figu...

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PUM

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Abstract

A power quality analyzer circuit is suitable for the measurement field. The circuit is composed of a voltage detection circuit, a voltage gain control circuit, a voltage differential conversion circuit and a shaping circuit. The circuit structure is compact, the volume is small, the system is highly integrated, the signal consistency is good, the adaptability is good, the work efficiency is improved, the power consumption is low, and it has good anti-interference and reliability.

Description

Technical field [0001] The invention relates to a power quality analyzer circuit, which is suitable for the measurement field. Background technique [0002] Electricity is the most widely used and most important form of energy in modern society. The development of the power industry marks the level of development of a country. With the development of science and technology and social economy, the load of the power grid increases, especially the use of non-linear and shock load equipment, and the start and stop of a variety of large-scale equipment, causing more and more power grid interferences, and various sophisticated and sensitive The requirements for power quality of equipment are getting higher and higher. Therefore, a reasonable and effective solution to the power quality problem has become the focus of current power electronic technology research. [0003] Due to the good linearity and low sensitivity of the power load in the past, the small number and low power of electr...

Claims

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Application Information

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IPC IPC(8): G01R22/10
CPCG01R22/10
Inventor 王小义
Owner 王小义
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