Zero-point offset suppression method based on population image matching of magnetized micro-asymmetric cores

Abstract

The invention discloses a zero-point offset suppression method based on the image matching of magnetized micro-asymmetric magnetic core groups, which includes calculating the magnetization characteristic evaluation index IK of each magnetic core by using the characteristics of the hysteresis loop i ; Then calculate the magnetization characteristic evaluation index difference between any two magnetic cores to form a difference matrix Dev; then according to the difference matrix Dev and zero bias target I L , to obtain the matching difficulty coefficient D of each magnetic core i ; Finally, using the difference matrix and the matching difficulty coefficient, the magnetic modulator is composed of two magnetic cores with similar magnetization characteristics in a large batch of magnetic cores. The present invention calculates the matching difficulty coefficient of each magnetic core, and selects the magnetic core with the largest matching difficulty coefficient for matching each time, and can obtain the matching results of a large number of magnetic cores in a short time, and can make the magnetic modulator The zero offset is controlled below the expected target, laying the foundation for improving the resolution and accuracy of the magnetic modulator.

Description

technical field [0001] The invention belongs to the field of electrical technology, and more specifically relates to a zero-point offset suppression method based on image matching of magnetized micro-asymmetric magnetic core groups. Background technique [0002] In electrical fields such as power management and on-line monitoring, the demand for non-contact measurement of weak DC currents is increasing. Taking power cables as an example, with the widespread application of cables in smart grids, the importance of on-line monitoring of cable insulation has become increasingly prominent. The insulation degradation of the cable will produce a "rectification effect", resulting in a DC leakage current in the cable, which is one of the key indicators for evaluating the insulation status of the cable. However, the DC leakage current signal is very weak, usually in the μA level, so a high-resolution non-contact DC current sensor is required. [0003] Non-contact DC current sensors ...

AI Technical Summary

Problems solved by technology

[0005] Open-loop magnetic modulators usually use a dual-core differential structure to improve measurement resolution. Currently, the resolution has reached tens of microamperes. However, it is difficult to ensure that the two cores are completely consistent, and the weak magnetization asymmetry between the cores will lead to There is a zero point offset in the magnetic modulator, which makes it difficult to further improve the measurement resolution

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