Power converter and method including noise suppression by controlling phase shifting of converter cells
First Claim
1. A power converter provided with a plurality of arms which are each comprised of a plurality of converter cells and having a plural phase construction, wherein each phrase corresponds to an arm configured by connecting the plurality of converter cell in series, comprising a controller configured to:
- conduct interrupt processing of carrier waves of the converter cells to synchronize control of corresponding converter cells of the different arms,wherein each carrier wave is shifted by a predetermined shift value at each arm such that each phase is different from each other, andwherein each converter cell is driven, at each converter cell, by comparing a common instructed value per each arm and the carrier wave;
operate frequencies of the carrier waves of the converter cells in a state larger than a value which is obtained by dividing a maximum frequency of a human audible frequency band by the number of the converter cells in the arms; and
shift the value of the carrier wave at any converter cell to the predetermined shift value when the shift value of the carrier wave at that converter cell is displaced from the predetermined shift valued.
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Accused Products
Abstract
The noise generated from a power converter is suppressed by increasing the noise frequency to a level not lower than the maximum frequency of the human audible range. To obtain the frequency of an output current harmonic component as a noise source which has exceeded the maximum frequency of the human audible range, it is adequate to determine that the frequency of a driving carrier wave for the individual converter cells in the power converter, in which the phases of the carrier wave for the converter cells are mutually shifted by a given value between the converter cells, meets the following equation.
15 Citations
20 Claims
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1. A power converter provided with a plurality of arms which are each comprised of a plurality of converter cells and having a plural phase construction, wherein each phrase corresponds to an arm configured by connecting the plurality of converter cell in series, comprising a controller configured to:
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conduct interrupt processing of carrier waves of the converter cells to synchronize control of corresponding converter cells of the different arms, wherein each carrier wave is shifted by a predetermined shift value at each arm such that each phase is different from each other, and wherein each converter cell is driven, at each converter cell, by comparing a common instructed value per each arm and the carrier wave; operate frequencies of the carrier waves of the converter cells in a state larger than a value which is obtained by dividing a maximum frequency of a human audible frequency band by the number of the converter cells in the arms; and shift the value of the carrier wave at any converter cell to the predetermined shift value when the shift value of the carrier wave at that converter cell is displaced from the predetermined shift valued. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19)
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18. A power converting method for a power converter provided with a plurality of arms which are each comprised of a plurality of converter cells and having a plural phase construction, wherein each phase corresponds to an arm configured by connecting the plurality of converter calls in series, comprising:
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conducting interrupt processing of carrier waves of the converter cells to synchronize control of corresponding converter cells of the different arms, wherein each carrier wave is shifted by a predetermined shift value at each arm such that each phase is different from each other, and wherein each converter cell is driven, at each converter cell, by comparing a common instructed value per each arm and the carrier wave; operating frequencies of the carrier waves of the converter cells in a state larger than a value which is obtained by dividing a maximum frequency of a human audible frequency band by the number of the converter cells in the arms; and shifting the value of the carrier wave at any converter cell to the predetermined shift value when the shift value of the carrier wave at that converter cell is displaced from the predetermined shift valued. - View Dependent Claims (20)
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Specification