POWER CONVERSION SYSTEM
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Abstract
A power conversion system as an aspect of the present invention includes: a power converter using a plurality of legs to convert inputted electric power and output powers in a plurality of phases, each leg including upper and lower arms; and a controller 30 controlling the upper and lower arms of each leg to control pulse current flowing through the leg. The controller 30 calculates a duty ratio instruction of each leg in one control period for each phase and, concerning first and second legs among the plurality of legs provided for a certain one of the phases, changes the phase of the calculated duty ratio instruction so that a time period when positive pulse current flows through the first leg and a time period when negative pulse flows through the second leg overlap each other in the one control period.
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Citations
23 Claims
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1-12. -12. (canceled)
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13. A power conversion system converting inputted electric power into outputs in a plurality of phases, the system comprising:
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a power converter including a plurality of legs corresponding to each of the phases, each leg having upper and lower arms; and a controller individually controlling the upper and lower arms of each leg to control pulse current flowing through the leg, wherein the controller includes; a calculation unit calculating a duty ratio instruction for each leg in the one control period for each phase; and a phase adjustment unit changing a phase of the duty ratio instruction calculated by the calculation unit, and the phase adjustment unit changes the phases of the duty ratio instructions to allow the time period when positive pulse current flows through a first leg and the time period when negative pulse current flows through a second leg to overlap each other in the one control period, and the first leg and the second leg are provided for a certain one of the phases. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of controlling a power converter which is provided with a plurality of legs for each phase to convert electric power inputted to the power converter into outputs in a plurality of phases, each leg including upper and lower arms, the method comprising:
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calculating a duty ratio instruction for each of the legs in one control period for each phase, and changing phases of the calculated duty ratio instructions so that, concerning first and second legs among the plurality of legs provided for a certain one of the phases, a time period when positive pulse current flows through the first leg and a time period when negative pulse flows through the second leg overlap each other in the one control period.
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23. A power conversion system, comprising:
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power conversion means for converting inputted electric power into outputs in a plurality of phases by using a plurality of legs, each leg including upper and lower arms; and controlling means for controlling the upper and lower arms of each leg to control pulse current flowing through the leg, wherein concerning first and second legs among the plurality of legs provided for a certain one of the phases, a time period when positive pulse current flows through the first leg and a time period when negative pulse flows through the second leg overlap each other in the one control period.
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Specification