Device for using optical principle to detect direct current

Abstract

The invention relates to a current detection device, and particularly relates to a device for using an optical principle to detect direct current, so as to solve problems that the existing direct current sensor is seriously influenced by external interference factors and the detection precision of the sensor is influenced, and the existing sensor structure by using a hall principle is large in the size and the weight of the sensing part. The device for using the optical principle to detect direct current comprises an optical sensing detector, an optical modem, a digital circuit, a digital to analog converter and a display terminal. After the optical sensor detects a current signal, the optical modem and the digital to analog converter carry out mutual conversion between an analog signal and a digital signal, and the signals are finally displayed via the display terminal. The device for using the optical principle to detect direct current has the beneficial effects that the precision is high; a data storage and analysis function is provided; the size is small; the weight is light; a sensor joint is universally designed, which facilitates industrial production, field mounting and transportation; and fully enclosed-type stainless steel can resist strong magnetic interference, resist dust and resist water.

Description

technical field [0001] The invention relates to a current detection device, in particular to a device for detecting direct current by applying the optical principle. Background technique [0002] Most of the Hall current sensors produced in my country are open current sensors, the principle of which is that when the primary current I P When flowing through a long wire, a magnetic field will be generated around the wire. The magnitude of this magnetic field is proportional to the current flowing through the wire. The generated magnetic field gathers in the magnetic ring and is measured by the Hall element in the air gap of the magnetic ring. and amplifies the output, its output voltage V S Accurately reflect the primary current I P . . The advantage of this principle is that the structure is simple, the components used are less, and the production process is simple, but it also has certain shortcomings. Its own design has inherent design defects, and the circuit is suscep...

AI Technical Summary

Problems solved by technology

The advantage of this principle is that the structure is simple, the components used are less, and the production process is simple, but it also has certain shortcomings. Its own design has inherent design defects, and the circuit is susceptible to external interference factors, such as magnetic field, temperature etc., and the Hall device is still completely dependent on foreign imports. In order to reduce the impact of the transformer on the external temperature, some manufacturers have made some physical temperature compensation for the Hall transformer, that is, adding a resistance heater outside the sensor core. , so that the transformer is always in a constant temperature state to meet the influence of the ambient temperature on the transformer, but the actual use shows that such temperature compensation is of very little help to the Hall transformer. At the same time, it also greatly increases the energy consumption of the sensor itself.

[0003] In terms of structural design, due to the limitations of the Hall principle, the structural design of the sensing part must use a large number of silicon steel sheets as the magnetic core, which increases the volume and weight of the sensing part, and the structure becomes very large. The silicon steel sheet material itself is discrete, and it is difficult to achieve consistent magnetic properties. Therefore, it is difficult to standardize the process in the production process. The purpose of using silicon steel sheets as iron cores is to make the measured magnetic field have a magnetic uniformity. effect, but this also brings a negative impact on the sensing part. The surrounding stray magnetic field also produces magnetic field interference to its structure, which greatly reduces the accuracy of the measurement. In order to ensure the accuracy of the measurement, it is often used in engineering , artificially distance other adjacent magnetic field sources from the measured magnetic field, which results in an increase in the size of the equipment and the increase in the land area

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