Variable frequency drive system with medium voltage input and low voltage output
AssigneeTrane International Inc.
InventorBenjamin J. Sykora
Life of this patent
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Abstract
According to an embodiment of the present disclosure, an apparatus includes a transformer having a set of input terminals, a first set of output terminals, and a second set of output terminals. First and second rectifiers are coupled to the first and second sets of output terminals, respectively. The transformer is configured to transform three phase alternating current (AC) provided to the set of input terminals into first and second three phase AC outputs at the first and second sets of output terminals, respectively. The first three phase AC output is phase shifted from the second three phase AC output.
Claims20
An apparatus comprising:
- a transformer comprising a set of input terminals, a first set of output terminals, and a second set of output terminals;
- first and second rectifiers coupled to the first and second sets of output terminals, respectively;
- wherein the transformer is configured to transform three phase alternating current (AC) provided to the set of input terminals into first and second three phase AC outputs at the first and second sets of output terminals, respectively;
- wherein the first three phase AC output is phase shifted from the second three phase AC output;
- and
- wherein the transformer comprises:
- a set of primary windings;
- a first set of secondary windings and a second set of secondary windings;
- and
- wherein the first set of secondary windings but not the second set of secondary windings is arranged in a zigzag configuration.
An apparatus comprising:
- first, second and third rectifiers comprising first, second, and third sets of input terminals, respectively, and first, second, and third direct current (DC) output terminals, respectively;
- first, second, and third inverters comprising first, second, and third DC input terminals electrically connected to the first, second, and third DC output terminals, respectively, and first, second, and third sets of output terminals, respectively;
- an electric motor electrically connected to the first, second, and third sets of output terminals of the first, second, and third inverters, respectively;
- and
- a transformer electrically connected to the first, second, and third rectifiers, wherein the transformer comprises:
- a set of primary windings;
- a first set of secondary windings and a second set of secondary windings;
- and
- wherein the first set of secondary windings but not the second set of secondary windings is arranged in a zigzag configuration.
Dependencies are inferred from the claim text.