Multilevel power converter circuit
First Claim
Patent Images
1. A multilevel power converter circuit that converts from direct current to alternating current comprising:
- a direct current power supply series circuit including first and second direct current power supplies connected in series, the direct current power supply series circuit having a positive terminal, a negative terminal and an intermediate potential point, the intermediate potential point being at a junction of the first and second direct current power supplies;
a first semiconductor switch series circuit connected between the positive terminal and negative terminal of the direct current power supply series circuit, and a second semiconductor switch series circuit connected between an emitter of a 1st first semiconductor switch of the first semiconductor switch series circuit and a collector of a 2nth first semiconductor switch of the first semiconductor switch series circuit, n being an integer of 3 or higher;
the first semiconductor switch series circuit including 2n first semiconductor switches connected in series with each other, and first diodes connected in anti-parallel with each of said first semiconductor switches;
n−
1 first capacitors, one first capacitor connected between a collector of the nth first semiconductor switch of the first semiconductor switch series circuit and an emitter of the (n+1)th first semiconductor switch of the first semiconductor switch series circuit, and another first capacitor connected between a collector of the (n−
m)th first semiconductor switch of the first semiconductor switch series circuit and an emitter of the (n+m+1)th first semiconductor switch of the first semiconductor switch series circuit, wherein m is an integer of from 1 to n−
2;
the second semiconductor switch series circuit including 2n−
2 second semiconductor switches connected in series with each other and second diodes connected in anti-parallel with each of said second semiconductor switches;
n−
2 second capacitors, one second capacitor connected between a collector of the (n−
1)th second semiconductor switch of the second semiconductor switch series circuit and an emitter of the nth second semiconductor switch of the second semiconductor switch series circuit and, when n is 4 or higher, another second capacitor connected between a collector of the (n−
m)th second semiconductor switch of the second semiconductor switch series circuit and an emitter of the (n+m−
1)th second semiconductor switch of the second semiconductor switch series circuit; and
a bidirectional switch connected between an emitter of the nth first semiconductor switch of the first semiconductor switch series circuit and the intermediate potential point of the direct current power supply series circuit.
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Abstract
A multilevel power converter circuit driven by two direct current power supplies in series includes a first semiconductor switch series circuit that combines a series circuit of 2n IGBTs connected between positive and negative electrodes with a capacitor, a second semiconductor switch series circuit that combines a series circuit of 2n−2 IGBTs connected between the emitter of a first IGBT of the first semiconductor switch series circuit and the collector of a 2nth IGBT with a capacitor, and a bidirectional switch connected between an intermediate point of the second semiconductor switch series circuit and an intermediate point of the direct current power supply, to reduce a voltage change in the alternating current output when semiconductor switches are switching.
18 Citations
7 Claims
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1. A multilevel power converter circuit that converts from direct current to alternating current comprising:
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a direct current power supply series circuit including first and second direct current power supplies connected in series, the direct current power supply series circuit having a positive terminal, a negative terminal and an intermediate potential point, the intermediate potential point being at a junction of the first and second direct current power supplies; a first semiconductor switch series circuit connected between the positive terminal and negative terminal of the direct current power supply series circuit, and a second semiconductor switch series circuit connected between an emitter of a 1st first semiconductor switch of the first semiconductor switch series circuit and a collector of a 2nth first semiconductor switch of the first semiconductor switch series circuit, n being an integer of 3 or higher; the first semiconductor switch series circuit including 2n first semiconductor switches connected in series with each other, and first diodes connected in anti-parallel with each of said first semiconductor switches; n−
1 first capacitors, one first capacitor connected between a collector of the nth first semiconductor switch of the first semiconductor switch series circuit and an emitter of the (n+1)th first semiconductor switch of the first semiconductor switch series circuit, and another first capacitor connected between a collector of the (n−
m)th first semiconductor switch of the first semiconductor switch series circuit and an emitter of the (n+m+1)th first semiconductor switch of the first semiconductor switch series circuit, wherein m is an integer of from 1 to n−
2;the second semiconductor switch series circuit including 2n−
2 second semiconductor switches connected in series with each other and second diodes connected in anti-parallel with each of said second semiconductor switches;n−
2 second capacitors, one second capacitor connected between a collector of the (n−
1)th second semiconductor switch of the second semiconductor switch series circuit and an emitter of the nth second semiconductor switch of the second semiconductor switch series circuit and, when n is 4 or higher, another second capacitor connected between a collector of the (n−
m)th second semiconductor switch of the second semiconductor switch series circuit and an emitter of the (n+m−
1)th second semiconductor switch of the second semiconductor switch series circuit; anda bidirectional switch connected between an emitter of the nth first semiconductor switch of the first semiconductor switch series circuit and the intermediate potential point of the direct current power supply series circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A multilevel power converter circuit that converts from direct current to alternating current, comprising:
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a direct current power supply series circuit including first and second direct current power supplies connected in series, the direct current power supply series circuit having a positive terminal, a negative terminal and an intermediate potential point, the intermediate potential point being at a junction of the first and second direct current power supplies; a first semiconductor switch series circuit connected between the positive terminal and negative terminal of the direct current power supply series circuit, and a second semiconductor switch series circuit connected between an emitter of a 1st first semiconductor switch of the first semiconductor switch series circuit and a collector of a 2nth first semiconductor switch of the first semiconductor switch series circuit, n being an integer of 3 or higher; a bidirectional switch connected between an emitter of the nth first semiconductor switch of the first semiconductor switch series circuit and the intermediate potential point of the direct current power supply series circuit; the first semiconductor switch series circuit including 2n first semiconductor switches connected in series with each other and the second semiconductor switch series circuit including 2n−
2 second semiconductor switches connected in series with each other;n−
1 first capacitors, one first capacitor connected between a collector of the nth first semiconductor switch of the first semiconductor switch series circuit and an emitter of the (n+1)th first semiconductor switch of the first semiconductor switch series circuit, and another first capacitor connected between a collector of the (n−
m)th first semiconductor switch of the first semiconductor switch series circuit and an emitter of the (n+m+1)th first semiconductor switch of the first semiconductor switch series circuit, wherein m is an integer of from 1 to n−
2; andn−
2 second capacitors, one second capacitor connected between a collector of the (n−
1)th second semiconductor switch of the second semiconductor switch series circuit and an emitter of the nth second semiconductor switch of the second semiconductor switch series circuit and, when n is 4 or higher, another second capacitor connected between a collector of the (n−
m)th second semiconductor switch of the second semiconductor switch series circuit and an emitter of the (n+m−
1)th second semiconductor switch of the second semiconductor switch series circuit.
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Specification
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Current AssigneeFuji Electric Company Limited (Fuji Electric Systems Company Limited)
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Original AssigneeFuji Electric Company Limited (Fuji Electric Systems Company Limited)
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InventorsTakizawa, Satoki
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Primary Examiner(s)Dole, Timothy J
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Assistant Examiner(s)Andino, Ivan Laboy
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Application NumberUS14/344,059Publication NumberTime in Patent Office1,177 DaysField of Search363 16- 17, 363 34- 43, 363 95- 98, 363131-132, 363135-136US Class Current1/1CPC Class CodesH02M 1/0095 Hybrid converter topologies...H02M 1/088 for the simultaneous contro...H02M 7/217 using semiconductor devices...H02M 7/4837 Flying capacitor convertersH02M 7/487 Neutral point clamped inver...H02M 7/537 using semiconductor devices...H02P 27/06 using dc to ac converters o...
