DC Power Supply Bus Defect Detection via Voltage Ripple Analysis
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Solution Overview
Problem
Current power converters lack effective means to detect defects such as advanced wear of bus capacitors, short-circuits, voltage overloads, and precharge relay anomalies on the DC power supply bus, which can lead to operational issues and failures.
Innovation Solution
A method and system that monitor the voltage ripple and mean value of the DC power supply bus to detect anomalies, using a ratio of voltage ripple to mean value, and comparing variations to determine defects like inductor issues, power overloads, or capacitor wear without requiring additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no additional sensors are used for defect detection, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The existing voltage sensing circuit serves dual purposes: normal operation monitoring and defect detection. The system uses itself to detect defects by analyzing its own voltage ripple characteristics, eliminating the need for separate detection sensors while maintaining detection capability
Solution Approach 2:
The voltage sensing circuit is designed to perform multiple functions: standard voltage monitoring during normal operation and defect detection through ripple analysis. This multi-functionality allows the same hardware to serve both operational control and diagnostic purposes
2Reliability
If voltage ripple monitoring is added to detect defects, then reliability is improved, but device complexity increases
Solution Approach 1:
The control unit utilizes its existing computational resources to analyze voltage ripple characteristics for defect detection. By processing the voltage signal it already monitors for normal operation, the system gains defect detection capability without requiring separate monitoring hardware
Solution Approach 2:
The defect detection function is merged with the existing control and monitoring functions. The same control unit that manages power converter operation also performs ripple analysis and defect detection, combining multiple functions into a single integrated system
Data Source
AI summary
The invention relates to a method for detecting a defect on the DC power supply bus of a power converter connected to an electrical distribution network (RD). The method comprises steps of:determination of a mean value ( V) of the voltage (Vbus) of the DC power supply bus of the converter,determination of the ripple ({tilde over (V)}ppH1) of the voltage (Vbus) of the DC power supply bus,monitoring of the variation of the said mean value ( V) with respect to the said ripple ({tilde over (V)}ppH1),determination of a defect on the DC power supply bus as a function of the rate of the said variation, the said defect consisting of an anomaly on the inductor (L1) of the DC power supply bus, a power overload of the power converter, or advanced wear of the bus capacitor (Cbus).