Insulation monitoring circuit and detection method thereof

By designing an insulation monitoring circuit, sampling and calibration of the resistance values ​​of live and neutral lines, and combining calibration parameters to make multi-condition judgments, the problem of insufficient dynamic insulation monitoring accuracy in the prior art is solved, and higher monitoring accuracy and efficiency are achieved.

CN119644076APending Publication Date: 2025-03-18SHINRY TECH
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Patent Information

Application Number
CN202411868506.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-17
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

The existing insulation monitoring scheme has insufficient dynamic insulation monitoring accuracy during inverting, which is affected by X-capacitor, resulting in resistance coupling and cannot meet the set requirements.

Method used

An insulation monitoring circuit is designed, including a live-line sampling circuit and a neutral sampling circuit. By sampling the resistances on the live-line and neutral, the resistance values ​​are stored and calibrated, and multi-condition judgment is made in combination with calibration parameters to achieve the maximum resistance value judgment of dynamic insulation monitoring.

Benefits of technology

The insulation monitoring accuracy is improved, and the maximum value of dynamic insulation monitoring can be found through multiple conditions without changing the monitoring circuit, so as to meet the set monitoring accuracy requirements, thereby improving monitoring efficiency.

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Abstract

The embodiment of the invention provides a detection method of an insulation monitoring circuit and related equipment, which are used for improving the monitoring precision in an insulation monitoring scheme. The method provided by the embodiment of the invention comprises the following steps: respectively sampling resistors on an output live wire of a live wire sampling circuit and an output zero wire of a zero wire sampling circuit to obtain a live wire sampling resistor and a zero wire sampling resistor; based on the sampling frequency and the sampling period, storing all live wire sampling resistors and all null line sampling resistors, and determining the maximum value of all live wire sampling resistors as a live wire resistance calibration value and the maximum value of all null line sampling resistors as a null line resistance calibration value in the sampling period and the sampling frequency; and according to the live wire resistance calibration value and the zero line resistance calibration value, performing judgment with a calibration parameter value of a sampling circuit of at least one ADC to obtain a target judgment result, so as to realize judgment operation of the maximum resistance value among the output live wire, the output zero line and the ground wire according to the target judgment result.
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