Ripple Amplitude Statistics for Early Power Supply Degradation Detection
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Solution Overview
Problem
High performance power supplies for microprocessors and ASICs/FPGAs face reliability issues due to aging electrolytic capacitors, which cause increased equivalent series resistance and decreased capacitance, leading to unpredictable operation and rare but critical failures that are difficult to detect with existing power supply monitoring systems.
Innovation Solution
A ripple monitoring circuit that quantizes the amplitude of ripple components from the power supply, stores amplitude statistics, and compares them against thresholds to detect degradation before system failure, using a signal conditioning circuit and ADC to process the ripple signal and provide accurate health assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply supervisor ICs with trip points are used to detect out-of-spec power supply voltages, then system failures can be detected, but detection occurs too late for high reliability systems and cannot catch rare failures under specific conditions
Solution Approach 1:
The ripple monitoring circuit performs preliminary detection of power supply degradation by continuously measuring ripple characteristics before they cause system failure. The circuit quantizes ripple amplitudes and compares them against thresholds to generate early warnings, enabling preventive maintenance before actual failures occur.
Solution Approach 2:
The invention replaces the mechanical threshold-based detection system with a statistical analysis system. Instead of using fixed trip points, the circuit quantizes ripple amplitudes into multiple levels and performs statistical comparison against historical data, enabling more sensitive and timely detection of degradation trends.
2Measurement precision
If fast comparators with user-programmed trip points are used in Power Supply Managers, then stringent detection can be achieved, but false alarms occur too often and the two-state output cannot convey supporting information
Solution Approach 1:
The ripple amplitude is segmented into multiple quantization levels rather than using a single threshold. The counter bank divides the detection range into discrete bins, allowing the system to distinguish between different degrees of degradation and provide more nuanced diagnostic information about power supply health.
Solution Approach 2:
The circuit implements feedback by continuously comparing quantized ripple measurements against stored threshold values and updating the power supply health assessment dynamically. This feedback mechanism allows the system to adapt to changing conditions and reduce false alarms while maintaining high detection sensitivity.
3Duration of action of stationary object
If power supplies operate with degrading electrolytic capacitors, then the power supply continues to function, but reliability decreases and random failures occur
Solution Approach 1:
The ripple monitoring circuit performs preliminary detection of capacitor degradation by measuring changes in ripple characteristics before they lead to failure. By continuously monitoring quantized ripple amplitudes and comparing them against thresholds, the system can predict remaining useful life and schedule maintenance proactively.
Data Source
AI summary
A ripple monitoring circuit may generate information indicative of a failing component in a power supply. At least one input may receive a ripple signal from the power supply that has a ripple component. A quantization circuit may repeatedly quantize the amplitude of the ripple component. A ripple amplitude statistics counter bank may count and store the number of times that different quantized amplitudes or different ranges of quantized amplitudes of the ripple component occurred.A ripple monitoring circuit may generate information about a power supply. At least one input may receive a ripple signal from the power supply that has a ripple component. A ripple measurement circuit may measure a characteristic of the ripple component. A storage circuit may store information about the measurement. A comparison circuit may compare information stored in the storage circuit with a threshold value and indicate when the stored information meets or exceeds this threshold value.