Battery backup power supply
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United States of America Patent
Stats
-
Mar 19, 2002
Grant Date -
N/A
app pub date -
Jul 19, 2000
filing date -
Dec 1, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An uninterruptible power supply includes an inverter provided with power from a utility and a battery. The battery is connected through a FET so that battery power is instantly supplied to the inverter through the intrinsic FET diode when the utility power fails. The battery discharge FET is operated by an oscillator driven control circuit. The inverter includes an amplitude circuit and a polarity circuit. The inverter amplitude circuit includes FET operated by driver circuits that ensure efficient switching. The phase shifted full bridge pulse width modulated amplitude circuit converts the input power to a pulse width modulated output representing the amplitude of the power supply voltage, which is switched by the polarity circuit and to obtain the desired output voltage polarity. A falling edge bleeder ensures that a decreasing output voltage magnitude follows the desired waveform.
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