This paper outlines a non-invasive method for the detection of failure precursors for optical isolators used in switch-mode power supplies (SMPS). The method relies on the transfer characteristics of the closed loop operation of the power supply circuit to evaluate gain, rather than direct measurement of current at the isolator terminals. With voltage regulation, a power supply will continue to operate within specifications well beyond the onset of opto-isolator wear, but then fail suddenly when the damage accumulation reaches a threshold. We show that it is possible to detect the onset of degradation of the isolator before performance is adversely affected, and track the progression of a fault to provide greater lead time for field replacement. The method presented is simple to implement on many commercial off-the-shelf (COTS) supplies, and offers the advantage of longer maintenance cycles at lower cost. We show how this method can improve the accuracy of remaining useful life (RUL) prediction, reduce the occurrence of No Trouble Found (NTF), and improve manufacturing of highly reliable SMPS.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    A Prognostic Sensor for Voltage Regulated Switch-Mode Power Supplies


    Beteiligte:


    Erscheinungsdatum :

    2007-03-01


    Format / Umfang :

    1277203 byte





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    VEHICLE ISOLATION SWITCH FOR LOW VOLTAGE POWER SUPPLIES

    MAHMOUD HAYDAR ABDULKAREEM / JIANG DAVID | Europäisches Patentamt | 2020

    Freier Zugriff

    VEHICLE ISOLATION SWITCH FOR LOW VOLTAGE POWER SUPPLIES

    MAHMOUD ABDULKAREEM / JIANG DAVID | Europäisches Patentamt | 2020

    Freier Zugriff

    Prognostic Health Management for Avionics System Power Supplies

    Orsagh, R. / Brown, D. / Roemer, M. et al. | British Library Conference Proceedings | 2005