System and method for limiting losses in an uninterruptible power supply
First Claim
1. An uninterruptible power supply (UPS) system comprising:
- an input to receive input power having an input voltage;
an output to provide output power;
a neutral line;
an automatic voltage regulation (AVR) transformer coupled to the input and the output of the UPS and having an input, an output, a core and a plurality of switches controllably coupled to at least one of the core, the input and the output;
a bypass switch configured to selectively couple the core of the AVR transformer to the neutral line; and
a controller configured to control the plurality of switches of the AVR transformer and the bypass switch,wherein the controller is configured to control the bypass switch to isolate the core of the AVR transformer from the neutral line in a first mode of operation and to couple the core of the AVR transformer to the neutral line in a second mode of operation, andwherein the controller is configured to, in the first mode of operation, couple a first one of the plurality of switches of the AVR transformer to the core and the AVR transformer input and a second one of the plurality of switches of the AVR transformer to the core and to the AVR transformer output in a configuration of the UPS to provide an output voltage of the AVR transformer that is equal to an input voltage at the input of the UPS.
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Accused Products
Abstract
Aspects of the invention are directed to systems and method for limiting losses in an uninterruptible power supply. In one aspect, the present invention provides an uninterruptible power supply (UPS) comprising an input to receive input power having an input voltage, an output to provide output power having an output voltage, a neutral line, an automatic voltage regulation (AVR) transformer coupled to the input and the output of the UPS and having an input, an output, a core and at least one switch controllably coupled to at least one of the core, the input and the output, and a means for isolating the core of the AVR transformer from the neutral line when the input voltage is substantially equal to a defined output voltage.
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Citations
23 Claims
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1. An uninterruptible power supply (UPS) system comprising:
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an input to receive input power having an input voltage; an output to provide output power; a neutral line; an automatic voltage regulation (AVR) transformer coupled to the input and the output of the UPS and having an input, an output, a core and a plurality of switches controllably coupled to at least one of the core, the input and the output; a bypass switch configured to selectively couple the core of the AVR transformer to the neutral line; and a controller configured to control the plurality of switches of the AVR transformer and the bypass switch, wherein the controller is configured to control the bypass switch to isolate the core of the AVR transformer from the neutral line in a first mode of operation and to couple the core of the AVR transformer to the neutral line in a second mode of operation, and wherein the controller is configured to, in the first mode of operation, couple a first one of the plurality of switches of the AVR transformer to the core and the AVR transformer input and a second one of the plurality of switches of the AVR transformer to the core and to the AVR transformer output in a configuration of the UPS to provide an output voltage of the AVR transformer that is equal to an input voltage at the input of the UPS. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of providing stable power in an uninterruptible power supply (UPS) having an automatic voltage regulation (AVR) transformer, an input to receive input power having an input voltage with an AC voltage waveform, an output to provide output power having an output voltage, and a neutral line, the AVR transformer having an input, an output and a core selectively coupled to the neutral line, the method comprising:
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determining whether the input voltage to the UPS is within a specified tolerance; if the input voltage to the UPS satisfies a first condition, isolate the core of the AVR transformer from the neutral line in a first mode of operation; if the input voltage of the UPS satisfies a second condition, couple the core of the AVR transformer to the neutral line in a second mode of operation; and configuring, in the first mode of operation, the AVR transformer to provide output voltage that is equal to the input voltage at the input of the UPS. - View Dependent Claims (13, 14, 15, 16)
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17. An uninterruptible power supply (UPS) system comprising:
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an input to receive input power having an input voltage; an output to provide output power having an output voltage; a neutral line; an automatic voltage regulation (AVR) transformer coupled to the input and the output of the UPS and having an input, an output, a core and a plurality of switches controllably coupled to at least one of the core, the input and the output; and means for isolating the core of the AVR transformer from the neutral line, in a first mode of operation; wherein the plurality of switches are selectively coupled, in the first mode of operation, to the core in a configuration of the UPS to provide an output voltage of the AVR transformer that is equal to the input voltage at the input of the UPS. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification