Due to their high specific volumetric capacitance, electrolytic capacitors are used in many fields of power electronics, mainly for filtering and energy storage functions. Their characteristics change strongly with frequency, temperature and aging time. Electrolytic capacitors are among the components whose lifetime has the greatest influence on the reliability of electrical systems. Over the past three decades, many efforts in academic research have bee. Due to their high specific volumetric capacitance, electrolytic capacitors are used in many fields of power electronics, mainly for filtering and energy storage functions. Their characteristics change strongly with frequency, temperature and aging time. Electrolytic capacitors are among the components whose lifetime has the greatest influence on the reliability of electrical systems. Over the past three decades, many efforts in academic research have been devoted to improving reliability capacitor. Industrial applications require more reliable power electronic products. It is in this context that the different electrolytic capacitors and their characteristics are discussed. The aging process of aluminum electrolytic capacitors is explained. Finally, this paper reviews existing methods of failure prognosis of electrolytic capacitors.••••A comprehensive review on the properties of electrolytic capacitor is presented.••Characteristics of three different types of electrolytic capacitors are explained.••The article reviews the study of predictive maintenance to anticipate breakdowns.••Methods based on the variation of aging indicators for aging laws are listed.Electrolytic capacitorFailure modesAging lawPredictive maintenanceCapacitors are used in many fields of electronics and their main uses are the following:••Energy storage (data backup, system protection. ),••Power factor correction,••Regulation of the output voltage of switch mode power supplies,••Input or output filtering of static converters,••In conversion systems, electrolytic capacitors, which ensure a stable DC network, are an important part of the electrical energy conversion chain. During operation, they are subject to electrical and environmental stresses (ambient temperature, current ripple, applied voltage, humidity, vibrations, etc.) and their lifetime is affected. In order to.
