Insulation Resistance Sensing With Adaptive Moving Average Switching
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Solution Overview
Problem
Existing insulation resistance detection devices require a long period for convergence and accurate detection, leading to delayed determination of electric leakage due to pulsation in detection voltage, which is not effectively reduced by using a larger number of detection voltages.
Innovation Solution
The proposed insulation resistance detection device uses a first moving average value calculated with a relatively large number of detection voltages when the detection voltage changes significantly, and switches to a second moving average value calculated with a smaller number of detection voltages once pulsation is attenuated, allowing for early stabilization and accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a larger number of detection voltages are used to calculate the moving average value, then the accuracy of insulation resistance detection is improved, but the time required for convergence is extended
Solution Approach 1:
The patent applies dynamics by making the range of detection voltages used for moving average calculation variable rather than fixed. The control unit dynamically adjusts the voltage range based on the detected pulsation level: when pulsation is detected, a wider range is used to filter it out, and when pulsation subsides, a narrower range is used to achieve faster convergence. This dynamic adjustment resolves the contradiction between accuracy and convergence time.
Solution Approach 2:
The patent changes the parameter of voltage range used in moving average calculation based on the pulsation state. By monitoring pulsation and adjusting the effective voltage range accordingly, the system optimizes the balance between filtering pulsation (requiring larger range) and achieving fast convergence (requiring smaller range), thus resolving the technical contradiction.
2Stability of the object's composition
If the detection voltage range is expanded to reduce pulsation, then the stability of detection is improved, but the responsiveness to actual insulation changes is reduced
Solution Approach 1:
The system dynamically adjusts the voltage range based on pulsation detection. When pulsation is present, a larger range stabilizes the detection by filtering out the pulsating component. When pulsation is absent, the range is reduced to improve responsiveness. This dynamic adaptation resolves the contradiction between stability and responsiveness.
Solution Approach 2:
The patent segments the detection process into different phases based on pulsation presence: a first phase with expanded voltage range for pulsation suppression, and a second phase with narrowed range for responsive detection. This segmentation allows the system to optimize for different requirements at different times, resolving the contradiction.
Data Source
AI summary
An insulation resistance detection device detects a voltage at a connection point between a coupling capacitor and a resistance in the case where a frequency signal is outputted to the resistance, and detects an insulation resistance between a ground portion and a power supply path based on a moving average value of a detection voltage. The insulation resistance detection device includes a first determination unit, a resistance detection unit, and a second determination unit. In response to a determination that the pulsation of the detection voltage is attenuated, the resistance detection unit detects the insulation resistance based on, instead of a first moving average value, a second moving average value calculated by using the detection voltage in a second range including a smaller number of detection voltages than in the first range.