Capacitor Aging Detection in Power Supply Calculation Circuit
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Solution Overview
Problem
The performance degradation of power supplies due to capacitor aging is not easily detectable in real time, leading to unnecessary energy waste and equipment abnormalities, as users typically replace the power supply only after complete failure.
Innovation Solution
A calculation circuit within the power supply that includes output current and voltage detection circuits and a processor to calculate the current capacitor value or hold-up time, triggering notifications for preventive replacement based on measured data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If users replace the power supply only after complete failure, then device complexity is reduced, but reliability deteriorates due to performance degradation during operation
Solution Approach 1:
The system performs preliminary detection of capacitor aging conditions before complete failure occurs. The processor continuously monitors capacitor parameters and predicts remaining life, enabling users to replace the power supply proactively before performance degradation affects operation, thus resolving the contradiction between simplicity and reliability.
2Reliability
If real-time capacitor aging monitoring is implemented, then reliability is improved, but device complexity increases due to additional detection circuits and processing
Solution Approach 1:
The processor in the power supply performs multiple functions: it controls the switching elements, monitors output parameters, calculates capacitor aging conditions, and generates replacement notifications. By making the processor multi-functional, the system achieves real-time monitoring without adding separate dedicated detection hardware, thus resolving the contradiction between reliability improvement and device complexity.
Solution Approach 2:
The power supply system monitors its own capacitor aging conditions using its existing processor and measurement capabilities. The system self-diagnoses its health status and generates replacement notifications without requiring external monitoring equipment, thereby improving reliability while minimizing additional complexity.
3Measurement precision
If continuous monitoring of power supply parameters is performed, then measurement precision of capacitor aging is improved, but use of energy increases due to continuous operation of detection circuits
Solution Approach 1:
The system continuously monitors power supply parameters using the existing processor and measurement circuits that are already operational during power supply operation. Since the processor must be active to control the power supply anyway, the additional monitoring and calculation operations consume minimal incremental energy while providing continuous capacitor aging detection, thus resolving the contradiction between measurement precision and energy consumption.
Data Source
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AI summary
The disclosure provides a power supply (100), a calculation circuit (120) and a capacitor aging detection method thereof. The power supply (100) includes a power conversion circuit (110) and the calculation circuit (120). The power conversion circuit (110) converts an input voltage (VIN) into an output voltage to obtain output power (Po). The calculation circuit (120) is coupled to the power conversion circuit (110) to measure a capacitor voltage, the output power (Po), and time information of the power conversion circuit (110). The calculation circuit (120) uses the capacitor voltage, the output power (Po), and the time information to calculate a current capacitor value (Cnow) of the power conversion circuit (110), and triggers a notification based on the current capacitor value (Cnow).