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US 7,402,921 B2Granted
Method and apparatus for providing uninterruptible power
AssigneeAmerican Power Conversion Corporation
InventorsMichael Ingemi, Emanuel Landsman
Life of this patent
Estimating the term…
Abstract
At least one aspect is directed to an uninterruptible power supply that includes a first input to receive a first input voltage from a first voltage source, a second input to receive a second input voltage from a second voltage source, and a boost circuit coupled to the first input and the second input. The boost circuit is configured to provide a positive output DC voltage and a negative output DC voltage derived from at least one of the first input voltage and the second input voltage. The uninterruptible power supply is configured such that in a back-up mode of operation, the negative output DC voltage is derived from the second input voltage using a circuit that includes at least two controlled switches coupled in series.
Claims38
An uninterruptible power supply comprising:
- a first input to receive a first input voltage from a first voltage source;
- a second input to receive a second input voltage from a second voltage source;
- and
- a boost circuit coupled to the first input and the second input and configured to provide a positive output DC voltage and a negative output DC voltage derived from at least one of the first input voltage and the second input voltage, wherein the uninterruptible power supply is configured such that in a back-up mode of operation, both the positive output DC voltage and the negative output DC voltage are derived from the second voltage source and the negative output DC voltage is derived from the second input voltage using a circuit that includes at least two controlled switches coupled in series.
1 more element
An uninterruptible power supply comprising:
- a first input to receive a first input voltage from a first voltage source;
- a second input to receive a second input voltage from a second voltage source;
- and
- a boost circuit coupled to the first input and the second input and configured to provide a positive output DC voltage and a negative output DC voltage derived from at least one of the first input voltage and the second input voltage, wherein the uninterruptible power supply is configured such that in a back-up mode of operation, the negative output DC voltage is derived from the second input voltage using a circuit that includes at least two controlled switches coupled in series;
- a control circuit coupled to the boost circuit, wherein the boost circuit includes a positive boost circuit and a negative boost circuit, wherein the control circuit is coupled to the positive boost circuit to control the positive boost circuit to generate the positive DC output voltage in a line mode of operation from at least the first input voltage, and wherein the control circuit is coupled to the negative boost circuit to control the negative boost circuit to generate the negative DC output voltage in the line mode of operation from at least the first input voltage, wherein the at least two controlled switches includes a first controlled switch that forms a part of the negative boost circuit, and a second controlled switch coupled to the control circuit, the second input and to the negative boost circuit and configured such that in the back-up mode of operation, a current path is formed through the first controlled switch and the second controlled switch;
- and
- a third input to couple to a ground connection of at least one of the first voltage source and the second voltage source;
- wherein the negative boost circuit includes:
- a first diode coupled between the third input and a first node of the first controlled switch;
- an inductor having a first node and a second node with the second node coupled to a second node of the first controlled switch;
- and
- a second diode coupled to the second node of the first controlled switch;
- and
- wherein the second controlled switch has a first node coupled to the second input and a second node coupled to the first node of the first controlled switch.
11 more elements
An uninterruptible power supply comprising:
- a first input to receive a first input voltage from a first voltage source;
- a second input to receive a second input voltage from a second voltage source;
- and
- a boost circuit coupled to the first input and the second input and configured to provide a positive output DC voltage and a negative output DC voltage derived from at least one of the first input voltage and the second input voltage, wherein the uninterruptible power supply is configured such that in a back-up mode of operation, the negative output DC voltage is derived from the second input voltage using a circuit that includes at least two controlled switches coupled in series
- wherein the at least two controlled switches includes a first controlled switch and a second controlled switch, and wherein the uninterruptible power supply further comprises;
- a third input to couple to a ground connection of at least one of the first voltage source and the second voltage source;
- and
- a negative boost circuit that includes a first diode coupled between the third input and a first node of the first controlled switch, an inductor having a first node and a second node with the second node coupled to a second node of the first controlled switch, and a second diode coupled to the second node of the first controlled switch;
- wherein the second controlled switch has a first node coupled to the second input and a second node coupled to the first node of the first controlled switch;
- and
- further comprising the second voltage source and wherein the second voltage source includes a battery coupled between the second input and the third input.
8 more elements
A method of generating an output voltage from at least one of a first input voltage source providing a primary voltage and a secondary input voltage source providing a back-up voltage, the method comprising:
- in a line mode of operation, generating a positive DC voltage and a negative DC voltage derived from at least the primary voltage;
- and
- in a back-up mode of operation, generating a positive DC voltage and a negative DC voltage derived from the back-up voltage;
- wherein in the back-up mode of operation, the negative DC voltage is generated using a plurality of controlled switches operatively coupled in series to create a current path from the secondary input voltage source through each of the plurality of controlled switches.
1 more element
An uninterruptible power supply comprising:
- a first input to receive a first input voltage from a first voltage source;
- a second input to receive a second input voltage from a second voltage source;
- and means for providing a positive output DC voltage and a negative output DC voltage derived from at least one of the first input voltage and the second input voltage, wherein the means for providing is configured such that in a back-up mode of operation, the positive output DC voltage and the negative DC output voltage are derived from the second voltage source, with the negative output DC voltage being derived from the second input voltage using a circuit that includes at least two controlled switches coupled in series.
Dependencies are inferred from the claim text.