A method and apparatus for acquiring magnetic field signals at IGBT turn-on and turn-off times.

By using dual FIFO memory groups and opto-isolated transmission technology, the problem of complete acquisition of magnetic field signals at the IGBT turn-on and turn-off moments in the converter valve was solved, improving the accuracy of device aging identification and the stability of signal transmission, thus ensuring the safety and reliability of the converter valve.

CN122307433APending Publication Date: 2026-06-30ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
Filing Date
2026-05-18
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing technologies make it difficult to accurately acquire the magnetic field signal at the IGBT turn-on and turn-off moments within the converter valve, resulting in inaccurate health status assessments. Furthermore, existing devices are bulky, have poor compatibility with the central control board, and cannot be stably installed and transmit signals in confined spaces.

Method used

A dual-FIFO memory group is used for segmented control logic, combined with opto-isolated transmission, and inverse Manchester encoding is used to achieve efficient signal acquisition and transmission, ensuring the integrity of the full waveform characteristics of the magnetic field signal at the IGBT turn-on and turn-off times.

Benefits of technology

This improves the accuracy of IGBT health status assessment, enhances the stability and anti-interference capability of signal transmission, and ensures the safe and reliable operation of the converter valve.

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Abstract

This invention pertains to the field of power and discloses a method and apparatus for acquiring magnetic field signals at the IGBT turn-on and turn-off moments. The method includes: converting magnetic field sensing signals into digital sample values ​​and determining whether a sampling trigger moment has been reached based on the digital sample values; dividing multiple FIFO memories within an FPGA control module into a first memory group and a second memory group, and cyclically updating and storing the digital sample values ​​through the first memory group before the sampling trigger moment is reached; controlling the first memory group to stop data updates and latching all currently stored pre-trigger data when the sampling trigger moment is reached, and controlling the second memory group to continuously write digital sample values ​​after the sampling trigger moment; reading complete sample data from the first and second memory groups and sending the complete sample data to a photoelectric conversion module; receiving optical signals through a converter valve control board and reconstructing the magnetic field signal waveform at the IGBT turn-on and turn-off moments via integration calculation on a host computer.
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