Multiphase transformer having main and auxiliary transformers

Claim 2

A multi-phase transformer system, comprising: a main transformer fed by an N-phase voltage; an auxiliary transformer fed by the N-phase voltage; wherein windings in the main transformer are connected to secondary windings in the auxiliary transformer to provide pairs of connected windings, each pair of connected windings having one of the windings of the main transformer and one of the secondary windings of the auxiliary transformer, the windings in such connected pair being arranged to produce voltages having different phases with each pair of windings producing an output voltage equal to the vector sum of the voltages produced by the such connected pair of windings; and wherein the N-phase voltage is connected to: (a) the primary winding of the auxiliary transformer; (b) the primary windings of the main transformer through the secondary windings of the auxiliary transformer, each pair of windings including one of the secondary winding of the auxiliary transformer and one of the primary windings of the main transformer.

Claim 3

A multi-phase transformer system, comprising: a main transformer, comprising: a main secondary winding section; a main primary winding section magnetically coupled to the main secondary winging section; wherein the main primary winding section includes a plurality of M sets of main windings, where M is an integer greater than one, each one of the M sets having a plurality of N main windings for producing N voltages having the same amplitudes and a predetermined phase relationship, the amplitudes of the voltages produced by one of the sets being different from the amplitude of the voltages produced by another one of the sets; an auxiliary transformer, comprising: an auxiliary primary winding section connected to inputs of the main transformer section; a plurality of M auxiliary secondary winding sets magnetically coupled to an auxiliary primary winding section; wherein each one of the M sets of auxiliary secondary winding sets is connected to a corresponding one of the M sets of main windings, each one of the auxiliary secondary windings in each one of the M sets thereof being arranged to produce N voltages having the predetermined phase relationship with the amplitudes of the voltage produced in each one of the M sets of auxiliary secondary windings are equal and with the amplitudes of the voltages produced in one of the M sets of auxiliary secondary windings being different from the amplitudes of the voltages produced in another one of the sets M sets of auxiliary secondary windings; wherein each one the windings in each one of the sets M sets of auxiliary secondary windings is connected to a corresponding one of the windings in the one of the M sets of main windings to form a pair of connected windings, the windings in the connected pair produce voltages having different amplitudes and phases, each one of the connected pair of windings producing an output voltage equal to the vector sum of the voltages produced by the connected pair of windings; wherein the N-phase voltage is connected to (a) the primary winding of the auxiliary transformer; and, (b) to the primary windings of the main transformer through the secondary windings of the auxiliary transformer, and wherein each pair of windings includes one of the secondary winding of the auxiliary transformer and one of the primary windings of the main transformer.

Claim 4

A multi-phase transformer system, comprising: a main transformer, comprising: a main secondary winding section; a main primary winding section magnetically coupled to the main secondary winging section; wherein the main primary winding section includes a plurality of M sets of main windings, where M is an integer greater than one, each one of the M sets having a plurality of N main windings for producing N voltages having the same amplitudes and a predetermined phase relationship, the amplitudes of the voltages produced by one of the sets being different from the amplitude of the voltages produced by another one of the sets; an auxiliary transformer, comprising: an auxiliary primary winding section connected to inputs of the main transformer section; a plurality of M auxiliary secondary winding sets magnetically coupled to an auxiliary primary winding section; wherein each one of the M sets of auxiliary secondary winding sets is connected to a corresponding one of the M sets of main windings, each one of the auxiliary secondary windings in each one of the M sets thereof being arranged to produce N voltages having the predetermined phase relationship with the amplitudes of the voltage produced in each one of the M sets of auxiliary secondary windings are equal and with the amplitudes of the voltages produced in one of the M sets of auxiliary secondary windings being different from the amplitudes of the voltages produced in another one of the sets M sets of auxiliary secondary windings; wherein each one the windings in each one of the sets M sets of auxiliary secondary windings is connected to a corresponding one of the windings in the one of the M sets of main windings to form a pair of connected windings, the windings in the connected pair produce voltages having different amplitudes and phases, each one of the connected pair of windings producing an output voltage equal to the vector sum of the voltages produced by the connected pair of windings; wherein the N-phase voltage is connected to (a) the primary winding of the auxiliary transformer; and, (b) to the primary windings of the main transformer through the secondary windings of the auxiliary transformer, and wherein each pair of windings includes one of the secondary winding of the auxiliary transformer and one of the primary windings of the main transformer.

Claim 5

A multi-phase transformer system, comprising: (a) main transformer, comprising: (i) a main primary winding section; (ii) a main secondary winding section magnetically coupled to the main primary winding section; (iii) wherein the main primary winding section includes: (A) a plurality of M sets of windings, where M is an integer greater than one, each one of the M sets having a plurality of N main windings producing N voltages having the same amplitudes and a predetermined phase relationship with the amplitudes of the voltages produced by one of the sets being different from the amplitude of the voltages produced by another one of the sets; (b) an auxiliary transformer, comprising: (i) an auxiliary primary winding section having inputs connected to inputs of the main transformer section; (ii) a plurality of M auxiliary winding sets magnetically coupled to the auxiliary primary winding section; (iii) wherein each one of the M sets of auxiliary windings is connected to a corresponding one of the M sets of main windings; (iv) wherein each one of the auxiliary windings in each one of the M sets thereof produces N voltages having the predetermined phase relationship, the amplitudes of the voltage produced in each one of the sets thereof being equal; (v) wherein the amplitudes of the voltages produced in one of the M sets of auxiliary secondary windings are different from the amplitudes of the voltages produced in another one of the sets thereof; (c) wherein each one the windings in each one of the M sets of auxiliary secondary windings is connected to a corresponding one of the windings in the one of the sets of main secondary windings to form a pair of connected windings; (d) wherein the windings in the connected pair of windings produce voltages having different amplitudes and phases, each one of the connected pair of windings being arranged to produce an output voltage equal to the vector sum of the voltages produced by the connected pair of windings; and (e) wherein the M sets of main windings are primary windings of the main transformer each pair of windings including one of the secondary winding of the auxiliary transformer and one of the primary windings of the main transformer.

Claim 6

A multi-phase transformer system, comprising: (a) main transformer, comprising: (i) a main primary winding section; (ii) a main secondary winding section magnetically coupled to the main primary winding section; (iii) wherein the main primary winding section includes: (A) a plurality of M sets of windings, where M is an integer greater than one, each one of the M sets having a plurality of N main windings producing N voltages having the same amplitudes and a predetermined phase relationship with the amplitudes of the voltages produced by one of the sets being different from the amplitude of the voltages produced by another one of the sets; (b) an auxiliary transformer, comprising: (i) an auxiliary primary winding section having inputs connected to inputs of the main transformer section; (ii) a plurality of M auxiliary winding sets magnetically coupled to the auxiliary primary winding section; (iii) wherein each one of the M sets of auxiliary windings is connected to a corresponding one of the M sets of main windings; (iv) wherein each one of the auxiliary windings in each one of the M sets thereof produces N voltages having the predetermined phase relationship, the amplitudes of the voltage produced in each one of the sets thereof being equal; (v) wherein the amplitudes of the voltages produced in one of the M sets of auxiliary secondary windings are different from the amplitudes of the voltages produced in another one of the sets thereof; (c) wherein each one the windings in each one of the M sets of auxiliary secondary windings is connected to a corresponding one of the windings in the one of the sets of main secondary windings to form a pair of connected windings; (d) wherein the windings in the connected pair of windings produce voltages having different amplitudes and phases, each one of the connected pair of windings being arranged to produce an output voltage equal to the vector sum of the voltages produced by the connected pair of windings; and (e) wherein the M sets of main windings are primary windings of the main transformer each pair of windings including one of the secondary winding of the auxiliary transformer and one of the primary windings of the main transformer.

Claim 7

A multi-phase transformer system, comprising: a main transformer fed by an N-phase voltage; an auxiliary transformer fed by the N-phase voltage; wherein windings in the main transformer are connected to secondary windings in the auxiliary transformer to provide pairs of connected windings, each pair of connected windings having one of the windings of the main transformer and one of the secondary windings of the auxiliary transformer, the windings in such connected pair being arranged to produce voltages having different phases with each pair of windings producing an output voltage equal to the vector sum of the voltages produced by the such connected pair of windings; and wherein the leakage inductance of the main transformer is different from the leakage inductance of the auxiliary transformer.

Claim 8

A multi-phase transformer system, comprising: a main transformer fed by an N-phase voltage; an auxiliary transformer fed by the N-phase voltage; wherein windings in the main transformer are connected to secondary windings in the auxiliary transformer to provide pairs of connected windings, each pair of connected windings having one of the windings of the main transformer and one of the secondary windings of the auxiliary transformer, the windings in such connected pair being arranged to produce voltages having different phases with each pair of windings producing an output voltage equal to the vector sum of the voltages produced by the such connected pair of windings; and wherein the leakage inductance of the main transformer is different from the leakage inductance of the auxiliary transformer.

Claim 9

The system recited in claim 4 wherein the leakage inductance of the auxiliary transformer is larger than the leakage inductance of the main transformer.

Claim 10

A multi-phase transformer system, comprising: a main transformer fed by an N-phase voltage; an auxiliary transformer fed by the N-phase voltage; wherein windings in the main transformer are connected to secondary windings in the auxiliary transformer to provide pairs of connected windings, each pair of connected windings having one of the windings of the main transformer and one of the secondary windings of the auxiliary transformer, the windings in such connected pair being arranged to produce voltages having different phases with each pair of windings producing an output voltage equal to the vector sum of the voltages produced by the such connected pair of windings wherein the auxiliary transformer has a plurality of legs, each leg has a primary winding and at least one secondary winding, and wherein the leakage inductance in one of the legs is different from the leakage inductance in another one of the legs.

Claim 11

A multi-phase transformer system, comprising: a main transformer fed by an N-phase voltage; an auxiliary transformer fed by the N-phase voltage; wherein windings in the main transformer are connected to secondary windings in the auxiliary transformer to provide pairs of connected windings, each pair of connected windings having one of the windings of the main transformer and one of the secondary windings of the auxiliary transformer, the windings in such connected pair being arranged to produce voltages having different phases with each pair of windings producing an output voltage equal to the vector sum of the voltages produced by the such connected pair of windings wherein the auxiliary transformer has a plurality of legs, each leg has a primary winding and at least one secondary winding, and wherein the leakage inductance in one of the legs is different from the leakage inductance in another one of the legs.