Matrix converter
First Claim
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1. A matrix converter for converting a polyphase alternating current into a desired output alternating current, the matrix converter comprising:
- at least a first stage and a second stage;
the at least first stage and second stage including a plurality of controllable bidirectional switches, which converts m input phases of the polyphase alternating current into the output alternating current with n phases, wherein m represents a number of phases of the polyphase alternating current and n represents a number of phases of the output alternating current, n>
1, m>
2 and m is an integer multiple of n;
wherein m number of the plurality of controllable bidirectional switches are disposed in the first stage of the converter, each controllable bidirectional switch controlling a respective phase of the polyphase alternating current, and wherein the first stage is connected directly to a generator;
wherein m/n groups of controllable bidirectional switches are disposed in the second stage of the converter, each group having n number of the plurality of controllable bidirectional switches connected in parallel, each switch being individually connected to a respective one of the n phases of the output alternating current; and
wherein each controllable bidirectional switch further comprises a plurality of switching elements disposed in series as a stack in each bidirectional switch so as to be able to withstand a voltage, wherein p represents a number of groups controllable bidirectional switches disposed in the first stage, and each group of controllable bidirectional switches disposed in the first stage is comprised of k1 switching elements, and q represents a number of groups of controllable bidirectional switches disposed in the second stage, and each group of controllable bidirectional switches disposed in the second stage is comprised of n switch stacks, each switch stack being comprised of k2 switching elements in series, wherein p*q=m and each of the p groups of a stack being formed by k1 switching elements connects to one of the switching groups of the second stage, and wherein each switch stack of the second stage of the converter connects one of the p groups of the first stage to one of the n phases of the output alternating current.
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Abstract
A matrix converter for converting a polyphase alternating current into a desired alternating output current includes at least two stages; a plurality of controllable bidirectional switches, converts m phases of the polyphase alternating current into alternating output current with n (n<m) phases of a load; and a controllable bidirectional switch controlling each phase of the polyphase alternating current in at least one stage of the converter.
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Citations
18 Claims
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1. A matrix converter for converting a polyphase alternating current into a desired output alternating current, the matrix converter comprising:
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at least a first stage and a second stage; the at least first stage and second stage including a plurality of controllable bidirectional switches, which converts m input phases of the polyphase alternating current into the output alternating current with n phases, wherein m represents a number of phases of the polyphase alternating current and n represents a number of phases of the output alternating current, n>
1, m>
2 and m is an integer multiple of n;wherein m number of the plurality of controllable bidirectional switches are disposed in the first stage of the converter, each controllable bidirectional switch controlling a respective phase of the polyphase alternating current, and wherein the first stage is connected directly to a generator; wherein m/n groups of controllable bidirectional switches are disposed in the second stage of the converter, each group having n number of the plurality of controllable bidirectional switches connected in parallel, each switch being individually connected to a respective one of the n phases of the output alternating current; and wherein each controllable bidirectional switch further comprises a plurality of switching elements disposed in series as a stack in each bidirectional switch so as to be able to withstand a voltage, wherein p represents a number of groups controllable bidirectional switches disposed in the first stage, and each group of controllable bidirectional switches disposed in the first stage is comprised of k1 switching elements, and q represents a number of groups of controllable bidirectional switches disposed in the second stage, and each group of controllable bidirectional switches disposed in the second stage is comprised of n switch stacks, each switch stack being comprised of k2 switching elements in series, wherein p*q=m and each of the p groups of a stack being formed by k1 switching elements connects to one of the switching groups of the second stage, and wherein each switch stack of the second stage of the converter connects one of the p groups of the first stage to one of the n phases of the output alternating current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for converting a polyphase alternating current into a desired alternating output current using a matrix converter having at least a first stage and a second stage, the method comprising:
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converting m phases of the polyphase alternating current into the alternating output current with n (n<
m) phases using a plurality of controllable bidirectional switches arranged into groups, wherein m represents a number of phases of the polyphase alternating current and n represents a number of phases of the alternating output current;controlling each phase of the polyphase alternating current in at least one of the first stage and the second stage of the converter using at least one of the plurality of controllable bidirectional switch; wherein, if commutations are requested inside the first stage group, then no commutation is requested on the second stage, and if commutations are requested from one group to another one, then the commutation request is applied on the second stage.
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Specification