Apparatus and method for operating an uninterruptible power supply
First Claim
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1. An uninterruptable power supply, comprising:
- an input circuit including a first transistor and a first inductor, the input circuit being configured to receive an AC voltage at an input and provide a DC voltage at an output;
a controller having a digital signal processor and a field programmable gate array, the controller being coupled to the input circuit to detect inductor current and to provide a detected inductor current value to the digital signal processor, the controller being configured to apply a pulse width modulation control signal to the first transistor to adjust a switching frequency of the first transistor to generate the DC voltage at the output; and
wherein the first transistor forms part of a first boost converter circuit;
wherein the second transistor forms part of a second boost converter circuit;
wherein the input circuit includes a three phase rectifier;
wherein the controller is further configured to apply the pulse width modulation control signal to the first transistor to switch a mode of operation of the first boost converter circuit between variable frequency just-discontinuous and fixed frequency continuous modes of operation during a first portion of a line cycle; and
the controller is further configured to apply a second pulse width modulation control signal to the second transistor to switch a mode of operation of the second boost converter circuit between variable frequency just-discontinuous and fixed frequency continuous modes of operation during a second portion of the line cycle.
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Abstract
Systems and methods for operating an uninterruptable power supply are provided. The uninterruptable power supply may include a rectifier that has a transistor and an inductor. The uninterruptable power supply may also include a controller. A current sensor can be configured to detect inductor current and to provide a detected inductor current value to the controller to generate a current error value based and to generate a pulse width modulation control signal based in part on the current error value. The controller can apply the pulse width modulation control signal to the transistor to adjust a switching frequency of the transistor.
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Citations
18 Claims
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1. An uninterruptable power supply, comprising:
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an input circuit including a first transistor and a first inductor, the input circuit being configured to receive an AC voltage at an input and provide a DC voltage at an output; a controller having a digital signal processor and a field programmable gate array, the controller being coupled to the input circuit to detect inductor current and to provide a detected inductor current value to the digital signal processor, the controller being configured to apply a pulse width modulation control signal to the first transistor to adjust a switching frequency of the first transistor to generate the DC voltage at the output; and wherein the first transistor forms part of a first boost converter circuit; wherein the second transistor forms part of a second boost converter circuit; wherein the input circuit includes a three phase rectifier; wherein the controller is further configured to apply the pulse width modulation control signal to the first transistor to switch a mode of operation of the first boost converter circuit between variable frequency just-discontinuous and fixed frequency continuous modes of operation during a first portion of a line cycle; and the controller is further configured to apply a second pulse width modulation control signal to the second transistor to switch a mode of operation of the second boost converter circuit between variable frequency just-discontinuous and fixed frequency continuous modes of operation during a second portion of the line cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating an uninterruptable power supply including an input circuit, the input circuit having a first transistor and a first inductor, a controller having a digital signal processor and a field programmable gate array, and a second transistor, wherein the first transistor forms part of a first boost converter circuit and wherein the second transistor forms part of a second boost converter circuit, the method comprising:
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detecting inductor current of the input circuit; providing a detected inductor current value to the digital signal processor; generating a current error value based in part on the detected inductor current value; providing the current error value to the field programmable gate array; generating a pulse width modulation control signal based in part on the current error value; applying the pulse width modulation control signal to the first transistor to control a switching frequency of one of the first transistor and the second transistor; applying the pulse width modulation control signal to the first transistor to switch a mode of operation of the first boost converter circuit between variable frequency just-continuous and fixed frequency continuous modes of operation during a first portion of a line cycle; and applying a second pulse width modulation control signal to the second transistor to switch a mode of operation of the second boost converter circuit between variable frequency just-continuous and fixed frequency continuous modes of operation during a second portion of the line cycle. - View Dependent Claims (14, 15, 16)
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17. An uninterruptable power supply, comprising:
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an input circuit including a first transistor, a second transistor, and an inductor, the first transistor forming part of a first boost converter circuit, the second transistor forming part of a second boost converter circuit; a controller having a digital signal processor and a field programmable gate array and coupled to the input circuit to detect inductor current and to provide a detected inductor current value to the digital signal processor; and means for applying a pulse width modulation control signal to one of the first transistor and the second transistor to adjust a switching frequency of one of the first transistor and the second transistor to switch a mode of operation of the first boost converter circuit between variable frequency just-discontinuous and fixed frequency continuous modes of operation during a first portion of a line cycle and to switch a mode of operation of the second boost converter circuit between variable frequency just-discontinuous and fixed frequency continuous modes of operation during a second portion of a line cycle. - View Dependent Claims (18)
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Specification