Method and apparatus for prediction of FAILURE electrolytic capacitor, and uninterruptible power converter equipped with such a device

A method of predicting failure of at least one capacitor (31) comprising: - determining (42, 43, 44, 52) of the ripple voltage (Udc) of the temperature (TP) of the current (Ic ) of the capacitor, - determining (53) the value of an equivalent series resistance (ESR) of the capacitor of the capacitance value (C) of the capacitor, using a digital filter, - determining ( 54) information representative of the capacitance of the aging condition based on the capacitor temperature, and- the indication (56, 58) of said information and information representing the value of the capacitance (C ) and / or information representative of at least one cause associated with the aging condition based on the value of the failure prediction capacite.Un device of at least one capacitor to implement the method. a converter (11) and an uninterruptible power supply comprising the dispositi f.