POWER SUPPLY UNIT WITH SERVICE LIFE EXPIRATION ALARM AND METHOD THEREOF
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United States of America Patent
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Issued Date -
Apr 25, 2013
app pub date -
Dec 8, 2011
filing date -
Oct 25, 2011
priority date (Note) -
Abandoned
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Abstract
A power supply unit includes a storage unit, a temperature detecting unit, a ripple voltage detecting unit, and a processor. The storage unit stores a conversion relationship between ripple voltages V in different temperature ranges and equivalent ripple voltages Vs at a standard temperature Ts. The temperature detecting unit and the ripple voltage detecting unit detects a temperature T and a ripple voltage V of an electrolytic capacitor of the power supply unit respectively. The processor acquires an initial ripple voltage Vi of the electrolytic capacitor at an initial temperature Ti, acquires a working ripple voltage Vw at a working temperature Tw, converts Vi and Vw to equivalent ripple voltages Vis and Vws at the standard temperature Ts according to the relationship, compares Vws with Vis, and determines whether service life of the power supply unit is nearing its end.
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