Capacitor RUL Estimation Using Iterative Aging Models
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Solution Overview
Problem
Existing methods for estimating the remaining useful life (RUL) of capacitors, particularly electrolytic capacitors, are costly, complex, and inflexible, requiring extensive offline calculations and dedicated equipment, making them unsuitable for industrial applications.
Innovation Solution
A method that iteratively acquires environment measurements such as temperature, voltage, and current to calculate aging models, allowing for real-time estimation of RUL without the need for extensive offline calculations or dedicated equipment, using band-pass filters to determine ESR and capacitance values and adjusting models based on temperature and voltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If prior art methods use extensive offline calculations and dedicated equipment to build aging models, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts only the essential parameters (ESR and capacitance) needed for RUL estimation, eliminating the need for complex comprehensive aging models. By focusing on these two key parameters that directly indicate capacitor degradation, the system achieves accurate RUL prediction without requiring extensive offline calculations or dedicated testing equipment.
Solution Approach 2:
The patent uses band-pass filters to create simplified representations of the capacitor's electrical characteristics. Instead of building complex physical test setups, the system uses signal processing to extract ESR and capacitance information from normal operating signals, effectively creating a virtual model that captures the essential aging behavior without physical complexity.
2Reliability
If prior art methods require extensive offline calculations and multiple measurements, then reliability of RUL estimation is improved, but loss of time increases significantly
Solution Approach 1:
The patent performs preliminary extraction of ESR and capacitance parameters during normal capacitor operation using band-pass filters on existing signals. This preliminary action captures the essential aging indicators without requiring separate testing phases, allowing the system to maintain reliable RUL estimation while minimizing the time lost to model construction and data collection.
3Measurement precision
If prior art methods use version-specific aging models for each capacitor, then measurement precision is improved, but adaptability decreases when new capacitor versions are introduced
Solution Approach 1:
The patent develops a universal monitoring approach that measures ESR and capacitance parameters applicable to all capacitor versions. Instead of creating separate aging models for each capacitor type, the system uses the same measurement methodology and parameter extraction process across different versions, achieving both precision through parameter-specific analysis and adaptability through methodological universality.
4Reliability
If periodic replacement is recommended every five years, then reliability is improved by avoiding unscheduled stops, but loss of time and resources increase due to premature replacements
Solution Approach 1:
The patent implements continuous monitoring of ESR and capacitance parameters with feedback to the control system. When these parameters indicate approaching end-of-life conditions, the system provides early warning signals that enable planned maintenance interventions. This feedback mechanism replaces capacitors based on actual condition rather than fixed schedules, maintaining reliability while avoiding premature replacements and associated time losses.
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 reduces computational requirements and enhances flexibility, enabling more efficient and cost-effective monitoring of capacitor health, allowing for timely maintenance and reducing unnecessary replacements.
Implementation Method 1
using band-pass filters to determine ESR and capacitance values
Implementation Method 2
Capacitors are well known devices that are able to store electric energy by accumulating positive and negative charges in anodes and cathodes separated by a dielectric component
Implementation Method 3
A real capacitor can be seen as equivalent to a resistance, named Equivalent Series Resistance, ESR
Data Source
AI summary
A method for determining a value representative of the remaining useful life, RUL, of a capacitor, the method comprising the following operations:repeating for several iterations 1 to k, k being an integer greater than 1:acquiring environment measurements that are representative of the environment of the capacitor at a current iteration;based on previous environment measurements acquired at previous iterations 1 to k−1 before the current iteration, and on the received environment measurements at iteration k, calculating at least one aging model;based on the at least one calculated aging model, determining the value representative of the RUL of the capacitor.