Cascaded multi-level power converter
First Claim
1. A multilevel power converter comprising:
- n input stages, n being greater than or equal to 2, each input stage of rank k, k being 1 through n, having k+1 identical input converters that are connected to one another, each converter being supplied with an input voltage and controlled to apply an electrical potential to an output on the basis of said input voltage;
each input converter of the input stage of rank k−
1 being supplied with a voltage resulting from the electrical potentials applied to two outputs by two converters of input stage of rank k;
an output stage connected to the input stage of rank 1 and having an output converter supplied with a differential voltage resulting from a first electrical potential applied to an output of a first input converter of the input stage of rank 1 and from a second electrical potential applied to an output of a second input converter of the input stage of rank 1, said output converter being controlled to apply an electrical potential to an output;
wherein the input converters exhibit an identical topology, chosen from among architectures of Neutral Point Clamped (NPC), Active Neutral Point Clamped (ANPC) and Neutral Point Piloted (NPP);
wherein the output converter exhibits a different topology than the topology chosen for the input converters, said topology of the output converter being chosen from among architectures of Flying Capacitor (FC), Stacked Multicell Converter (SMC), Neutral Point Clamped (NPC), Neutral Point Piloted (NPP) and Active Neutral Point Clamped (ANPC) type;
wherein the input stage of rank 1 includes only two input converters conformed by the first input converter of the input stage of rank 1 and the second input converter of the input stage of rank 1;
wherein the input stage of rank 2 includes only three input converters conformed by a first input converter of the input stage of rank 2, a second input converter of the input stage of rank 2 and a third input converter of the input stage of rank 2;
wherein the first input converter of the input stage of rank 1 is directly connected to the first and the second input converters of the input stage of rank 2, and the output converter, without any intervening converter; and
wherein the second input converter of the input stage of rank 1 is directly connected to the second and the third input converters of the input stage of rank 2, and the output converter, without any intervening converter.
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Abstract
A multi-level power converter comprising: n input stages (Ein_n), n being at least equal to 1, each input stage comprising n+1 identical input converters (CONVx_En) connected together, the input converters (CONVx_En) exhibiting an identical topology, chosen from among the architectures of the NPC (Neutral Point Clamped), ANPC (Active Neutral Point Clamped), NPP (Neutral Point Piloted) and SMC (Stacked Multicell Converter); an output stage (Eout) connected to the input stage of rank 1 and comprising an output converter (CONVs) supplied with a differential voltage (Vfloat) resulting from a first electrical potential applied to the output of a first input converter of the input stage of rank 1 and from a second electrical potential applied to the output of a second input converter of the input stage of rank 1, the output converter (CONVs) exhibiting a topology chosen from among an architecture with floating capacitor (FC), SMC (Stacked Multicell Converter), NPC (Neutral Point Clamped), NPP (Neutral Point Piloted) and ANPC (Active Neutral Point Clamped).
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Citations
7 Claims
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1. A multilevel power converter comprising:
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n input stages, n being greater than or equal to 2, each input stage of rank k, k being 1 through n, having k+1 identical input converters that are connected to one another, each converter being supplied with an input voltage and controlled to apply an electrical potential to an output on the basis of said input voltage; each input converter of the input stage of rank k−
1 being supplied with a voltage resulting from the electrical potentials applied to two outputs by two converters of input stage of rank k;an output stage connected to the input stage of rank 1 and having an output converter supplied with a differential voltage resulting from a first electrical potential applied to an output of a first input converter of the input stage of rank 1 and from a second electrical potential applied to an output of a second input converter of the input stage of rank 1, said output converter being controlled to apply an electrical potential to an output; wherein the input converters exhibit an identical topology, chosen from among architectures of Neutral Point Clamped (NPC), Active Neutral Point Clamped (ANPC) and Neutral Point Piloted (NPP); wherein the output converter exhibits a different topology than the topology chosen for the input converters, said topology of the output converter being chosen from among architectures of Flying Capacitor (FC), Stacked Multicell Converter (SMC), Neutral Point Clamped (NPC), Neutral Point Piloted (NPP) and Active Neutral Point Clamped (ANPC) type; wherein the input stage of rank 1 includes only two input converters conformed by the first input converter of the input stage of rank 1 and the second input converter of the input stage of rank 1; wherein the input stage of rank 2 includes only three input converters conformed by a first input converter of the input stage of rank 2, a second input converter of the input stage of rank 2 and a third input converter of the input stage of rank 2; wherein the first input converter of the input stage of rank 1 is directly connected to the first and the second input converters of the input stage of rank 2, and the output converter, without any intervening converter; and wherein the second input converter of the input stage of rank 1 is directly connected to the second and the third input converters of the input stage of rank 2, and the output converter, without any intervening converter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification