Method and apparatus for providing uninterruptible power
First Claim
1. An uninterruptible power supply comprising:
- a first input having an input line connection and an input neutral connection to receive a first input voltage from a first voltage source;
a second input having a positive input connection and a negative input connection to receive a second input voltage from a second voltage source;
a boost circuit configured to provide a positive output DC voltage with respect to the input neutral connection and a negative output DC voltage with respect to the input neutral connection in both a line mode of operation and a backup mode of operation, the boost circuit including a first switching device having a first end and a second end with the second end coupled to the negative input connection and the boost circuit including a second switching device having a first end and a second end;
a first connection circuit configured to couple the first input to the boost circuit in the line mode of operation, and configured to couple the second input to the boost circuit in the backup mode of operation; and
a second connection circuit configured to couple the first end of the second switching device to the input neutral connection in the line mode of operation and to couple the first end of the second switching device to the positive input connection in battery mode of operation.
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Accused Products
Abstract
At least one aspect of the invention is directed to an uninterruptible power supply. The uninterruptible power supply includes a first input having an input line connection and an input neutral connection to receive a first input voltage from a first voltage source, a second input having a positive input connection and a negative input connection to receive a second input voltage from a second voltage source, a boost circuit configured to provide a positive output DC voltage with respect to the input neutral connection and a negative output DC voltage with respect to the input neutral connection in both a line mode of operation and a backup mode of operation, a first connection circuit configured to couple the first input to the boost circuit in the line mode of operation, and configured to couple the second input to the boost circuit in the backup mode of operation, and a second connection circuit configured to couple a midpoint of the boost circuit to the input neutral connection in the line mode of operation and to couple the midpoint of the boost circuit to the positive input connection in battery mode of operation.
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Citations
19 Claims
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1. An uninterruptible power supply comprising:
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a first input having an input line connection and an input neutral connection to receive a first input voltage from a first voltage source; a second input having a positive input connection and a negative input connection to receive a second input voltage from a second voltage source; a boost circuit configured to provide a positive output DC voltage with respect to the input neutral connection and a negative output DC voltage with respect to the input neutral connection in both a line mode of operation and a backup mode of operation, the boost circuit including a first switching device having a first end and a second end with the second end coupled to the negative input connection and the boost circuit including a second switching device having a first end and a second end; a first connection circuit configured to couple the first input to the boost circuit in the line mode of operation, and configured to couple the second input to the boost circuit in the backup mode of operation; and a second connection circuit configured to couple the first end of the second switching device to the input neutral connection in the line mode of operation and to couple the first end of the second switching device to the positive input connection in battery mode of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of providing power to a load, the method comprising:
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receiving input power at a line connection and a neutral connection from a first voltage source; rectifying the input power to produce a first rectified voltage at a first node during a positive portion of an input voltage wave and a second rectified voltage at a second node during a negative portion of the input voltage wave; in a line mode of operation, using a boost circuit to produce a positive DC voltage with respect to the neutral connection from the first rectified voltage and a negative DC voltage with respect to the neutral connection from the second rectified voltage, wherein the boost circuit includes a first boost transistor having a first end and a second end, and a second boost transistor having a first end and a second end, with the second end of the first boost transistor coupled to the neutral connection; detecting loss of input power, and in response, decoupling the first node and the second node from the line connection and the neutral connection, coupling the first node to a positive connection of a backup power source and coupling the second node to a negative connection of the backup power source, and coupling the first end of the second boost transistor to the positive connection. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An uninterruptible power supply comprising:
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a first input having an input line connection and an input neutral connection to receive a first input voltage from a first voltage source; a second input having a positive input connection and a negative input connection to receive a second input voltage from a second voltage source; a boost circuit configured to provide a positive output DC voltage with respect to the input neutral connection and a negative output DC voltage with respect to the input neutral connection in both a line mode of operation and a backup mode of operation; and means for coupling the first input to the boost circuit in the line mode of operation, for coupling the second input to the boost circuit in the backup mode of operation for coupling a a first boost transistor of the boost circuit to a second boost transistor in the line mode of operation, and for coupling the second boost transistor to the positive input connection in the backup mode of operation. - View Dependent Claims (16, 17, 18, 19)
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Specification