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Purpose: To ensure normal functioning of an electronic circuit, it is very important to monitor capacitor degradation. Although we canmonitor capacitor degradation by measuring electric characteristics, the capacitors to be measured must be disassembled from the circuit. In this study, a swelling-based failure prediction methodology for electrolytic capacitors that does not require disassembly of capacitors from the circuit is proposed. Methods: It is possible to measure the swelling length of a capacitor by using a computer-vision- based technique. In the experiment conducted in this study, deterioration was induced in 30 capacitors (Samwha, 50 V 1500 ìF) by applying reverse voltage. Through regression analysis, we can predict the capacitance of a capacitor based on its swelling length. Results: As capacitor deterioration progressed, capacitor swelling length, ESR value, and loss value increased, and capacitance decreased. Conclusion: It is possible to monitor capacitor degradation by measuring the swelling length of a capacitor because the results of the regression analysis show that the swelling length is strongly related to the electrical performance characteristics of a capacitor.
