Matrix converters
First Claim
Patent Images
1. A matrix converter comprising:
- three ac voltage lines;
two dc voltage lines;
a first switch connected between a first one of the three ac voltage lines and a first one of the two dc voltage lines, a second switch connected between a second one of the three ac voltage lines and the first one of the two dc voltage lines, a third switch connected between a third one of the three ac voltage lines and the first one of the two dc voltage lines, a fourth switch connected between the first one of the three ac voltage lines and a second one of the two dc voltage lines, a fifth switch connected between the second one of the three ac voltage lines and the second one of the two dc voltage lines, and a sixth switch connected between the third one of the three ac voltage lines and the second one of the two dc voltage lines, the first, second, third, fourth, fifth and sixth switches being controlled to open and close in a sequence using pulse width modulation such that each of the three ac voltage lines can be connected to one of the two dc voltage lines when one of the first, second, third, fourth, fifth and sixth switches is closed; and
a freewheel path between the two dc voltage lines that includes a reverse-blocking device;
wherein the first, second, third, fourth, fifth and sixth switches are bi-directional such that the matrix converter can be used for motoring applications where a three-phase ac input voltage is supplied to the three ac voltage lines from a supply network and rectified by the matrix converter to provide a dc output voltage on the two dc voltage lines, and for generating applications where a dc input voltage is supplied to the two dc voltage lines and inverted by the matrix converter to provide an ac output voltage on the three ac voltage lines; and
wherein the first, second, third, fourth, fifth and sixth switches are controlled using the pulse width modulation to connect the dc voltage lines to appropriate ac voltage lines or to none of the ac voltage lines during a motoring application with the dc voltage lines having a respective dc voltage polarity, and to connect the three ac voltage lines to appropriate dc voltage lines or to none of the dc voltage lines during a generating application with the dc voltage lines having the same respective dc voltage polarity such that the matrix converter is adapted to regulate bi-directional power flow while retaining a uni-directional dc voltage.
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Accused Products
Abstract
A matrix converter that can be used as part of a two-stage power converter has three ac three ac voltage lines AC1, AC2 and AC3 and two dc voltage lines DC1 and DC2. An array of six semiconductor switches 10a to 10f are arranged such that each of the three ac voltage lines AC1, AC2 an AC3 can be connected to one of the two dc voltage lines DC1 and DC2 when the associated switch is closed. A freewheel path is provided between the two dc voltage lines DC1 and DC2, which provides a fifth state of operation when all the switches 10a to 10f are open.
19 Citations
41 Claims
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1. A matrix converter comprising:
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three ac voltage lines; two dc voltage lines; a first switch connected between a first one of the three ac voltage lines and a first one of the two dc voltage lines, a second switch connected between a second one of the three ac voltage lines and the first one of the two dc voltage lines, a third switch connected between a third one of the three ac voltage lines and the first one of the two dc voltage lines, a fourth switch connected between the first one of the three ac voltage lines and a second one of the two dc voltage lines, a fifth switch connected between the second one of the three ac voltage lines and the second one of the two dc voltage lines, and a sixth switch connected between the third one of the three ac voltage lines and the second one of the two dc voltage lines, the first, second, third, fourth, fifth and sixth switches being controlled to open and close in a sequence using pulse width modulation such that each of the three ac voltage lines can be connected to one of the two dc voltage lines when one of the first, second, third, fourth, fifth and sixth switches is closed; and a freewheel path between the two dc voltage lines that includes a reverse-blocking device; wherein the first, second, third, fourth, fifth and sixth switches are bi-directional such that the matrix converter can be used for motoring applications where a three-phase ac input voltage is supplied to the three ac voltage lines from a supply network and rectified by the matrix converter to provide a dc output voltage on the two dc voltage lines, and for generating applications where a dc input voltage is supplied to the two dc voltage lines and inverted by the matrix converter to provide an ac output voltage on the three ac voltage lines; and wherein the first, second, third, fourth, fifth and sixth switches are controlled using the pulse width modulation to connect the dc voltage lines to appropriate ac voltage lines or to none of the ac voltage lines during a motoring application with the dc voltage lines having a respective dc voltage polarity, and to connect the three ac voltage lines to appropriate dc voltage lines or to none of the dc voltage lines during a generating application with the dc voltage lines having the same respective dc voltage polarity such that the matrix converter is adapted to regulate bi-directional power flow while retaining a uni-directional dc voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A power conversion method using a matrix converter comprising three ac voltage lines, two dc voltage lines, a first switch connected between a first one of the three ac voltage lines and a first one of the two dc voltage lines, a second switch connected between a second one of the three ac voltage lines and the first one of the two dc voltage lines, a third switch connected between a third one of the three ac voltage lines and the first one of the two dc voltage lines, a fourth switch connected between the first one of the three ac voltage lines and a second one of the two dc voltage lines, a fifth switch connected between the second one of the three ac voltage lines and the second one of the two dc voltage lines, and a sixth switch connected between the third one of the three ac voltage lines and the second one of the two dc voltage lines, the first, second, third, fourth, fifth and sixth switches being controlled to open and close in a sequence using pulse width modulation such that each of the three ac voltage lines can be connected to one of the two dc voltage lines when one of the first, second, third, fourth, fifth and sixth switches is closed, and a freewheel path between the two dc voltage lines that includes a reverse-blocking device, wherein the first, second, third, fourth, fifth and sixth switches are bi-directional such that the matrix converter can be used for motoring applications where a three-phase ac input voltage is supplied to the three ac voltage lines from a supply network and rectified by the matrix converter to provide a dc output voltage on the two dc voltage lines, and for generating applications where a dc input voltage is supplied to the two dc voltage lines and inverted by the matrix converter to provide an ac output voltage on the three ac voltage lines, and wherein the first, second, third, fourth, fifth and sixth switches are controlled using the pulse width modulation to connect the dc voltage lines to appropriate ac voltage lines or to none of the ac voltage lines during a motoring application with the dc voltage lines having a respective dc voltage polarity, and to connect the three ac voltage lines to appropriate dc voltage lines or to none of the dc voltage lines during a generating application with the dc voltage lines having the same respective dc voltage polarity such that the matrix converter is adapted to regulate bi-directional power flow while retaining a uni-directional dc voltage, the method comprising the steps of:
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supplying a momentary sample of an ac voltage to the dc voltage lines; and opening the first, second, third, fourth, fifth and sixth switches of the matrix converter so that the dc current flows through the freewheel path.
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23. A power converter comprising:
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a matrix converter having three ac voltage lines, two dc voltage lines, a first switch connected between a first one of the three ac voltage lines and a first one of the two dc voltage lines, a second switch connected between a second one of the three ac voltage lines and the first one of the two dc voltage lines, a third switch connected between a third one of the three ac voltage lines and the first one of the two dc voltage lines, a fourth switch connected between the first one of the three ac voltage lines and a second one of the two dc voltage lines, a fifth switch connected between the second one of the three ac voltage lines and the second one of the two dc voltage lines, and a sixth switch connected between the third one of the three ac voltage lines and the second one of the two dc voltage lines, the first, second, third, fourth, fifth and sixth switches being controlled to open and close in a sequence using pulse width modulation such that each of the three ac voltage lines can be connected to one of the two dc voltage lines when one of the first, second, third, fourth, fifth and sixth switches is closed, and a freewheel path between the two dc voltage lines that includes a reverse-blocking device, wherein the first, second, third, fourth, fifth and sixth switches are bi-directional such that the matrix converter can be used for motoring applications where a three-phase ac input voltage is supplied to the three ac voltage lines from a supply network and rectified by the matrix converter to provide a dc output voltage on the two dc voltage lines, and for generating applications where a dc input voltage is supplied to the two dc voltage lines and inverted by the matrix converter to provide an ac output voltage on the three ac voltage lines, and wherein the first, second, third, fourth, fifth and sixth switches are controlled using the pulse width modulation to connect the dc voltage lines to appropriate ac voltage lines or to none of the ac voltage lines during a motoring application with the dc voltage lines having a respective dc voltage polarity, and to connect the three ac voltage lines to appropriate dc voltage lines or to none of the dc voltage lines during a generating application with the dc voltage lines having the same respective dc voltage polarity such that the matrix converter is adapted to regulate bi-directional power flow while retaining a uni-directional dc voltage; and an inverter. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A power converter comprising:
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a first matrix converter having three ac voltage lines, two dc voltage lines, a first switch connected between a first one of the three ac voltage lines and a first one of the two dc voltage lines, a second switch connected between a second one of the three ac voltage lines and the first one of the two dc voltage lines, a third switch connected between a third one of the three ac voltage lines and the first one of the two dc voltage lines, a fourth switch connected between the first one of the three ac voltage lines and a second one of the two dc voltage lines, a fifth switch connected between the second one of the three ac voltage lines and the second one of the two dc voltage lines, and a sixth switch connected between the third one of the three ac voltage lines and the second one of the two dc voltage lines, the first, second, third, fourth, fifth and sixth switches of the first matrix converter being controlled to open and close in a sequence using pulse width modulation such that each of the three ac voltage lines can be connected to one of the two dc voltage lines when one of the first, second, third, fourth, fifth and sixth switches of the first matrix converter is closed, and a freewheel path between the two dc voltage lines that includes a reverse-blocking device, wherein the first, second, third, fourth, fifth and sixth switches of the first matrix converter are bi-directional such that the first matrix converter can be used for motoring applications where a three-phase ac input voltage is supplied to the three ac voltage lines from a supply network and rectified by the first matrix converter to provide a dc output voltage on the two dc voltage lines, and for generating applications where a dc input voltage is supplied to the two dc voltage lines and inverted by the first matrix converter to provide an ac output voltage on the three ac voltage lines, and wherein the first, second, third, fourth, fifth and sixth switches of the first matrix converter are controlled using the pulse width modulation to connect the dc voltage lines to appropriate ac voltage lines or to none of the ac voltage lines during a motoring application with the dc voltage lines having a respective dc voltage polarity, and to connect the three ac voltage lines to appropriate dc voltage lines or to none of the dc voltage lines during a generating application with the dc voltage lines having the same respective dc voltage polarity such that the first matrix converter is adapted to regulate bi-directional power flow while retaining a uni-directional dc voltage; and a second matrix converter having three ac voltage lines, two dc voltage lines, a first switch connected between a first one of the three ac voltage lines and a first one of the two dc voltage lines, a second switch connected between a second one of the three ac voltage lines and the first one of the two dc voltage lines, a third switch connected between a third one of the three ac voltage lines and the first one of the two dc voltage lines, a fourth switch connected between the first one of the three ac voltage lines and a second one of the two dc voltage lines, a fifth switch connected between the second one of the three ac voltage lines and the second one of the two dc voltage lines, and a sixth switch connected between the third one of the three ac voltage lines and the second one of the two dc voltage lines, the first, second, third, fourth, fifth and sixth switches of the second matrix converter being controlled to open and close in a sequence using pulse width modulation such that each of the three ac voltage lines can be connected to one of the two dc voltage lines when one of the first, second, third, fourth, fifth and sixth switches of the second matrix converter is closed, and a freewheel path between the two dc voltage lines that includes a reverse-blocking device, wherein the first, second, third, fourth, fifth and sixth switches of the second matrix converter are bi-directional such that the second matrix converter can be used for motoring applications where a three-phase ac input voltage is supplied to the three ac voltage lines from a supply network and rectified by the second matrix converter to provide a dc output voltage on the two dc voltage lines, and for generating applications where a dc input voltage is supplied to the two dc voltage lines and inverted by the second matrix converter to provide an ac output voltage on the three ac voltage lines, and wherein the first, second, third, fourth, fifth and sixth switches of the second matrix converter are controlled using the pulse width modulation to connect the dc voltage lines to appropriate ac voltage lines or to none of the ac voltage lines during a motoring application with the dc voltage lines having a respective dc voltage polarity, and to connect the three ac voltage lines to appropriate dc voltage lines or to none of the dc voltage lines during a generating application with the dc voltage lines having the same respective dc voltage polarity such that the second matrix converter is adapted to regulate bi-directional power flow while retaining a uni-directional dc voltage; wherein the three ac voltage lines of the first matrix converter and the three ac voltage lines of the second matrix converter are connected together, and the two dc voltage lines of the first matrix converter and the two dc voltage lines of the second matrix converter are connected together, such that the first and second matrix converters are arranged in parallel. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
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39. A method of power conversion using a matrix converter having three ac voltage lines, two dc voltage lines, a first switch connected between a first one of the three ac voltage lines and a first one of the two dc voltage lines, a second switch connected between a second one of the three ac voltage lines and the first one of the two dc voltage lines, a third switch connected between a third one of the three ac voltage lines and the first one of the two dc voltage lines, a fourth switch connected between the first one of the three ac voltage lines and a second one of the two dc voltage lines, a fifth switch connected between the second one of the three ac voltage lines and the second one of the two dc voltage lines, and a sixth switch connected between the third one of the three ac voltage lines and the second one of the two dc voltage lines, the first, second, third, fourth, fifth and sixth switches being controlled to open and close in a sequence using pulse width modulation such that each of the three ac voltage lines can be connected to one of the two dc voltage lines when one of the first, second, third, fourth, fifth and sixth switches is closed, and a freewheel path between the two dc voltage lines that includes a reverse-blocking device, the first, second, third, fourth, fifth and sixth switches being bi-directional, the method comprising the steps of:
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using the matrix converter for motoring applications where a three-phase ac input voltage is supplied to the three ac voltage lines from a supply network and rectified by the matrix converter to provide a dc output voltage on the two dc voltage lines, and for generating applications where a dc input voltage is supplied to the two dc voltage lines and inverted by the matrix converter to provide an ac output voltage on the three ac voltage lines; and controlling the first, second, third, fourth, fifth and sixth switches using the pulse width modulation to connect the dc voltage lines to appropriate ac voltage lines or to none of the ac voltage lines during a motoring application with the dc voltage lines having a respective dc voltage polarity, and to connect the three ac voltage lines to appropriate dc voltage lines or to none of the dc voltage lines during a generating application with the dc voltage lines having the same respective dc voltage polarity such that the matrix converter is adapted to regulate bi-directional power flow while retaining a uni-directional dc voltage. - View Dependent Claims (40, 41)
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Specification