Method and apparatus for providing uninterruptible power
First Claim
1. An uninterruptible power supply for providing power to a load, the uninterruptible power supply comprising:
- an input to receive input power;
an output to provide output power;
an input power circuit coupled to the input and having a DC output that provides DC power having a first DC voltage level;
a capacitor having a first end coupled to the DC output of the input power circuit and having a second end;
a back-up power source coupled to the input power circuit;
an output power circuit coupled to the DC output of the input power circuit and to the output of the uninterruptible power supply to provide the output power; and
a capacitor discharge circuit coupled to the first end of the capacitor and the second end of the capacitor and configured in a first mode of operation to discharge a voltage across the capacitor, such that an average discharge current through the discharge circuit is inversely proportional to a voltage across the capacitor for a first range of voltages across the capacitor.
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Accused Products
Abstract
Methods and apparatus for providing uninterruptible power are provided by aspects of the invention. One aspect is more particularly directed to an uninterruptible power supply for providing power to a load. The uninterruptible power supply includes an input to receive input power, an output to provide output power, an input power circuit coupled to the input and having a DC output that provides DC power having a first DC voltage level, a capacitor having a first end coupled to the DC output of the input power circuit and having a second end, a back-up power source coupled to the input power circuit, an output power circuit coupled to the DC output of the input power circuit and to the output of the uninterruptible power supply to provide the output power, and a capacitor discharge circuit coupled to the first end of the capacitor and the second end of the capacitor and configured in a first mode of operation to discharge a voltage across the capacitor, such that an average discharge current through the discharge circuit is inversely proportional to a voltage across the capacitor for a first range of voltages across the capacitor.
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Citations
21 Claims
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1. An uninterruptible power supply for providing power to a load, the uninterruptible power supply comprising:
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an input to receive input power;
an output to provide output power;
an input power circuit coupled to the input and having a DC output that provides DC power having a first DC voltage level;
a capacitor having a first end coupled to the DC output of the input power circuit and having a second end;
a back-up power source coupled to the input power circuit;
an output power circuit coupled to the DC output of the input power circuit and to the output of the uninterruptible power supply to provide the output power; and
a capacitor discharge circuit coupled to the first end of the capacitor and the second end of the capacitor and configured in a first mode of operation to discharge a voltage across the capacitor, such that an average discharge current through the discharge circuit is inversely proportional to a voltage across the capacitor for a first range of voltages across the capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An uninterruptible power supply for providing power to a load, the uninterruptible power supply comprising:
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an input to receive input power;
an output to provide output power;
an input power circuit coupled to the input and having a DC output that provides DC power having a first DC voltage level;
a capacitor having a first end coupled to the DC output of the input power circuit and having a second end;
a back-up power source coupled to the input power circuit;
an output power circuit coupled to the DC output of the input power circuit and to the output of the uninterruptible power supply to provide the output power; and
means for discharging a voltage across the capacitor, such that an average discharge current of the capacitor is inversely proportional to a voltage across the capacitor for a first range of voltages across the capacitor. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of discharging a voltage across a capacitor in a uninterruptible power supply, the method comprising:
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charging the capacitor to a first voltage value;
detecting the voltage across the capacitor; and
discharging the capacitor using a discharge current having an average value that is inversely proportional to the voltage across the capacitor, such that over at least a first range of voltages across the capacitor, the average value of the discharge current increases as the voltage across the capacitor decreases. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification