Switchable Voltage-Divider Control for Insulation Impedance Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power conversion systems face challenges in accurately detecting insulation impedance to ground without introducing additional impedance that can lower the overall insulation impedance, potentially leading to system failures.
Innovation Solution
The power conversion system incorporates a dual voltage-dividing circuit configuration with switch modules and a control module to selectively enable or disable circuits during detection and normal operation, minimizing additional impedance and maintaining high insulation levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an insulation impedance detection circuit is arranged in the power conversion system, then insulation impedance can be detected, but additional impedance is introduced that lowers the overall insulation impedance to ground
Solution Approach 1:
The patent implements a switchable detection circuit that can be dynamically enabled or disabled. The control module activates the voltage-dividing circuits and switch modules only when insulation impedance detection is required, and deactivates them during normal operation. This dynamic switching resolves the contradiction by allowing accurate detection when needed while maintaining high insulation impedance during normal operation.
Solution Approach 2:
The patent employs periodic detection cycles where the insulation impedance detection is performed at specific intervals rather than continuously. The control module periodically activates the detection circuits to measure insulation impedance, then deactivates them to restore high insulation levels. This periodic action allows the system to achieve detection accuracy while minimizing the time that additional impedance is present in the system.
2Measurement precision
If voltage-dividing circuits are connected in parallel with insulation impedance for detection, then detection can be performed, but the parallel connection reduces overall insulation impedance
Solution Approach 1:
The patent uses switch modules to dynamically control the connection of voltage-dividing circuits. During detection, the switch modules connect the voltage-dividing circuits in parallel with the insulation impedance to enable measurement. After detection, the switch modules disconnect these circuits, restoring the original high insulation impedance. This dynamic connection control resolves the contradiction between detection capability and insulation maintenance.
3Ease of operation
If detection circuits remain continuously connected, then detection is always possible, but insulation impedance to ground remains low
Solution Approach 1:
The patent implements periodic detection cycles where the control module schedules insulation impedance detection at appropriate intervals rather than maintaining continuous detection capability. The detection circuits are activated only during these scheduled periods, allowing the system to balance detection availability with the need to maintain high insulation impedance for safety during normal operation.
Solution Approach 2:
The control module dynamically manages the detection circuits based on system state and detection needs. Rather than keeping detection circuits continuously connected, the system activates them only when detection is required and deactivates them otherwise. This dynamic approach ensures system safety by maintaining high insulation impedance while still providing detection capability when needed.
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 configuration allows for accurate detection of insulation impedance while minimizing the impact of detection resistance, ensuring the power conversion system maintains a high insulation impedance to ground, thus preventing potential failures.
Implementation Method 1
a first voltage-dividing circuit, a second voltage-dividing circuit... The first voltage-dividing circuit includes a first circuit, a third circuit and a first insulation impedance connected in parallel between a positive electrode of the power conversion system and the ground
Data Source
AI summary
Disclosed are a power conversion system and a control method therefor. The power conversion system includes a first voltage-dividing circuit, a second voltage-dividing circuit, a switch module, a control module, and a detection module. The first voltage-dividing circuit includes a first circuit, a third circuit and a first insulation impedance connected in parallel between a positive electrode of the power conversion system and the ground. The second voltage-dividing circuit includes a second circuit, a fourth circuit, and a second insulation impedance connected in parallel between the ground and a negative electrode of the power conversion system. The switch module is arranged in at least one of the first voltage-dividing circuit and the second voltage-dividing circuit. The control module is connected to the switch module. The detection module is connected to the first voltage-dividing circuit or the second voltage-dividing circuit.