A digital AC and DC current sensor and current detection method

Abstract

The present invention provides a digital AC / DC current sensor, which is connected to a peripheral follow-up data interface, and includes a current detection unit, a signal preprocessing unit, an AD conversion unit, a digital signal processing unit, and a digital signal output unit connected in sequence, And a central control unit that links to each other with above-mentioned five units. The invention also provides a digital AC and DC current detection method. The digitized AC / DC current sensor of the present invention is based on the current measurement value in the form of voltage output by the current detection unit, which is converted into digital information by multiple units and output, and can directly output the measured current value represented by the digital signal form, thereby enhancing the current The anti-interference ability of the value signal reduces the cost of shielding noise; in addition, the present invention uses a central control unit to monitor the working status of the current detection unit to ensure that the analog current sensor outputs a credible analog voltage that reflects the measured current for subsequent signal processing use.

Description

technical field [0001] The invention relates to a current sensor and a current detection method, in particular to a digital AC / DC current sensor and a current detection method. Background technique [0002] Current sensors are widely used in power generation, power transformation, power transmission, power distribution and power consumption lines. The currents of various power consumption occasions are very different, ranging from a few amps to tens of thousands of amps. With the continuous improvement of national production and life and the gradual strengthening of environmental protection awareness, the accurate measurement of power quality has been put on the agenda. There are both DC current measurement requirements, AC current measurement requirements, and high-frequency current measurement requirements. How to accurately measure the current to obtain more real current information has become an urgent problem to be solved in industries such as industrial power consumpt...

AI Technical Summary

Problems solved by technology

[0007] In summary, due to the use of analog voltage signal output by traditional current sensors, the main shortcomings in the process of use are: 1. The voltage signal is easily disturbed during transmission, which affects the measured value of the current; 2. The working environment of the current sensor Usually contains a lot of electromagnetic interference, completely relying on shielding to reduce the degree of interference of voltage signals, it will be more difficult and costly in production and implementation; 3. Analog voltage signals are not conducive to storage and analysis; 4. Analog The voltage signal ignores the rapidly developing digital signal and digital information processing technology, which is not conducive to intelligence and digitization; 5. The working status of various analog current sensors is easily interfered by the surrounding electromagnetic environment to cause malfunction, etc.

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