Multiphase power supply with plural series connected cells and failed cell bypass
First Claim
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1. A method of operating a multiphase power supply having a plurality of converter cells connected in series in each of a plurality of legs each of said legs connected between a node and a respective line and such supply having line-to-line voltage outputs between pairs of said legs comprising:
- (a) detecting a failed cell in any of said legs;
(b) forming a current path in any of said legs having at least one failed cell by providing a bypass around each of said failed cell; and
(c) controlling the cells in the legs of said power supply to maximize said line-to-line voltage outputs, and to keep all line-to-line voltage outputs generally equal in magnitude.
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Abstract
A high output level is maintained in power supplies having multiple cells in each leg. Failed cells in any leg are bypassed to provide a current path through the respective leg. All of the unfailed cells are utilized while maintaining equal magnitude between phases and a balance phase relationship in the line-to-line output voltage. The invention may be utilized in conjunction with a peak voltage reduction circuit, and a by-pass switch.
282 Citations
47 Claims
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1. A method of operating a multiphase power supply having a plurality of converter cells connected in series in each of a plurality of legs each of said legs connected between a node and a respective line and such supply having line-to-line voltage outputs between pairs of said legs comprising:
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(a) detecting a failed cell in any of said legs; (b) forming a current path in any of said legs having at least one failed cell by providing a bypass around each of said failed cell; and (c) controlling the cells in the legs of said power supply to maximize said line-to-line voltage outputs, and to keep all line-to-line voltage outputs generally equal in magnitude. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a multiphase power supply having a plurality of converter cells connected in series in each of a plurality of legs each of said legs connected between a node and a respective line and such supply having line-to-line voltage outputs between pairs of said legs comprising:
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(a) detecting a failed cell in any of said legs; (b) forming a current path in any of said legs having at least one failed cell by providing a transfer of at least one of the input and output of each of said failed cells; and (c) controlling the cells in the legs of said power supply to maximize said line-to-line voltage outputs, and to keep all line-to-line voltage outputs generally equal in magnitude. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A multiphase power supply having a line-to-line voltage output comprising:
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(a) a plurality of converter cells in series arrangement in each of a plurality of legs each of legs connected between a node and a respective line; (b) a controller to control the output voltage of each of said cells thereby supplying said line-to-line voltage output between pairs of said legs; (c) said controller detecting a failed cell in any of said legs and in response thereto removing said failed cell from said series arrangement; (d) said controller controlling said cell outputs to maximize said line-to-line voltage output and to keep all line-to-line voltage outputs generally equal in magnitude. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification