Insulation impedance detection circuit, detection method thereof and storage medium

CN122361900APending Publication Date: 2026-07-10西安图为电气技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
西安图为电气技术有限公司
Filing Date
2026-06-10
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In high-voltage DC systems, when multiple operational amplifiers share a common power supply, there is a coupling effect between sampling channels, which leads to systematic deviations during high-precision measurements. Existing hardware isolation solutions increase cost and complexity.

Method used

By employing a single operational amplifier differential amplifier circuit, and establishing an uncoupled ideal model and coupling mapping matrix, combined with multiple measurement conditions, decoupling calculations are performed to achieve high-precision insulation impedance measurement, thus avoiding the use of hardware isolation devices.

Benefits of technology

It achieves high-precision insulation impedance measurement, reduces circuit cost and complexity, facilitates integration, and has cost and performance advantages.

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Abstract

This invention relates to the field of power electronics testing, and discloses an insulation impedance detection circuit, its detection method, and a storage medium. It employs a single operational amplifier differential amplifier circuit and achieves dual-channel sampling detection, resulting in fewer components, a simpler layout, and higher reliability. First, an uncoupled ideal model is established, and combined with multiple measurement conditions of the insulation impedance detection circuit, the uncoupled ideal relationship of the insulation impedance to ground under ideal conditions is determined. Then, a decoupling calculation is performed by combining the actual sampling voltage under each measurement condition with the uncoupled ideal relationship through a coupling mapping matrix. This considers the influence of coupling factors during the detection process and effectively corrects the ideal sampling voltage in the uncoupled ideal relationship, essentially eliminating the sampling coupling effect introduced by the operational amplifier's common ground in principle. This enables high-precision insulation impedance measurement while controlling circuit cost, maintaining circuit simplicity, and facilitating integration.
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