Insulation Resistance Measurement Using Voltage Convergence Detection
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Solution Overview
Problem
Existing methods for measuring insulation resistance in high-voltage battery packs, such as those in energy storage systems and electric vehicles, face challenges in rapid detection due to delays in voltage falling and rising caused by capacitors, leading to potential late detection of insulation breakdown.
Innovation Solution
The system determines convergence of voltages applied to measurement resistances connected in parallel with the insulation resistance, using a control unit to adjust switch states based on voltage change values, and calculates resistance values using convergence values to rapidly detect insulation breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitor is connected to the battery pack and an AC signal is applied to measure insulation resistance, then the disadvantage of insulation breakdown during measurement is solved, but the voltage falling and rising delay causes late detection of insulation breakage
Solution Approach 1:
The patent dynamically adjusts the measurement timing based on voltage convergence detection. Instead of using fixed measurement intervals, the system continuously monitors voltage changes and triggers insulation resistance measurement only when voltage convergence is detected, adapting the measurement process to real-time system state changes.
Solution Approach 2:
The patent implements a feedback mechanism where voltage convergence is continuously monitored and used to control the timing of insulation resistance measurement. The system measures voltage changes, determines when convergence occurs, and then triggers the measurement process accordingly, creating a closed-loop control system that optimizes detection timing.
2Ease of manufacture
If voltage measurement time is delayed due to capacitor voltage falling and rising, then measurement can be performed, but insulation breakage cannot be rapidly detected
Solution Approach 1:
The patent performs preliminary voltage convergence detection before initiating insulation resistance measurement. By monitoring voltage changes and determining convergence in advance, the system prepares the measurement timing optimally, ensuring that measurements are taken at the most appropriate moment without delaying detection of insulation breakage.
3Ease of operation
If fixed interval measurement is used, then measurement process is simple, but measurement period cannot be shortened for rapid detection
Solution Approach 1:
The patent transitions from static fixed-interval measurement to dynamic event-driven measurement. The measurement process is triggered by voltage convergence events rather than predetermined time intervals, allowing the system to adapt measurement timing to actual system conditions and achieve faster detection when insulation breakage occurs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for rapid detection of insulation breakage and shortens the measurement period by controlling electrical connections based on voltage convergence, rather than fixed intervals, thereby improving the speed and accuracy of insulation resistance measurement.
Implementation Method 1
determine whether first voltage of a first measurement resistance connected with a positive electrode insulation resistance in parallel and second voltages of second measurement resistances connected with a negative electrode insulation resistance in parallel converge
Data Source
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AI summary
The present invention relates to an insulation resistance measuring system and device, and more particularly, to an insulation resistance measuring system and device which determine whether first voltage of a first measurement resistance connected with a positive electrode insulation resistance in parallel and second voltage of a second measurement resistance connected with a negative electrode insulation resistance in parallel converge, respectively, control connection between the positive electrode insulation resistance and the negative electrode insulation resistance and the first and second measurement resistances according to whether the first voltage and the second voltage converge, respectively, and calculate resistance values of the positive electrode insulation resistance and the negative electrode insulation resistance by using convergence values of the first voltage and the second voltage, in order to measure the positive electrode insulation resistance and the negative electrode insulation resistance connected to both terminals of a battery pack with a capacitor, respectively.