Controlling method of a battery mode of a uninterruptible power supply for an active power factor corrected load
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United States of America Patent
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Jul 19, 2011
Grant Date -
Sep 23, 2010
app pub date -
Mar 18, 2009
filing date -
Mar 18, 2009
priority date (Note) -
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Abstract
A controlling method of a battery mode of a UPS for an active PFC power supply has the following acts of monitoring the AC power source and determining whether the AC power source is terminated or not, wherein if a determining result is positive, the controlling method proceeds to next act, and switching to the battery mode and converting a DC power source of a battery to a square wave. The square wave has a period, and each half of the period is alternately constituted by at least two ON times and at least two OFF times, and each of the at least two OFF times is equal to or less than a hold-up time of the active PFC load having a hold-up time circuit. Therefore, the voltage of the bulk capacitor of the active PFC power supply under a discharge condition is not lower than the low threshold voltage, since the OFF time of the square wave signal will be kept equal to or less than the hold-up time.
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