Symmetrical step-up and step-down autotransformer delta topology

Patent metadata

Field	Value
Publication number	US-10312017-B2
Application number	US-201715423434-A
Country	US
Kind code	B2
Filing date	Feb 2, 2017
Priority date	Jul 11, 2014
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

A multi-phase autotransformer (10) is disclosed. The exemplary transformer includes primary windings PWA, PWB, PWC) and secondary windings (SWA1-SWA4, SWB1-SWB4, SWC1-SWC4). The primary windings are connected in a delta configuration and to a three-phase input voltage source. Each secondary winding is electrically connected to a primary winding but is magnetically coupled to a different primary winding. Three sets of secondary windings provide three three-phase outputs (350A, 350B, 350C), each of which has a voltage which is less than the three-phase input voltage, the three-phase output of each set being phase-shifted with respect to the other sets. These three sets also, collectively, provide a multi-phase output (325). Another set of secondary windings, in conjunction with the input voltage, provides another multi-phase phase output (360) which has approximately the same voltage as the three-phase input voltage.

First claim

What is claimed is:

1. A power supply system, comprising:
an autotransformer having three primary windings connected in a delta configuration to receive a three-phase input voltage and having a plurality of secondary windings, each primary winding having a center tap and plurality of taps disposed symmetrically about the center tap, each secondary winding being electrically connected to a predetermined tap of the plurality of taps on a predetermined primary winding and magnetically coupled to a primary winding other than the predetermined primary winding to which it is electrically connected, a combination of the predetermined tap and the magnetically coupled predetermined primary winding being different for each secondary winding, the primary and secondary windings providing a plurality of phase-shifted three-phase outputs and a plurality of multi-phase outputs;
a first rectifier connected to a first one of the multi-phase outputs to provide a first DC output; and
a second rectifier connected to a second one of the multi-phase outputs to provide a second DC output.

2. The power supply system of claim 1 and further comprising a liquid pump and reservoir to pump cooling liquid to at least one of the autotransformer, the first rectifier, or the second rectifier.

3. The power supply system of claim 1 wherein the first rectifier provides a first DC output voltage and the second rectifier provides a second, different, output voltage.

4. The power supply system of claim 1 wherein the center taps collectively provide a said phase-shifted three-phase output.

5. The power supply system of claim 1 wherein the secondary windings are in a plurality of paired secondary windings, and wherein both secondary windings in a pair of paired secondary windings have a first end and a second end, the first end of a first secondary winding in a pair being electrically connected to a said predetermined tap on a first side of the center tap of the predetermined primary winding, the first end of a second secondary winding in a pair being electrically connected to a said predetermined tap symmetrically disposed opposite the center tap of the predetermined primary winding.

6. The power supply system of claim 5 wherein the second end of a plurality of secondary windings collectively provide a said phase-shifted three-phase output.

7. The power supply system of claim 5 wherein the center taps and the second end of a plurality of secondary windings collectively provide a said multi-phase output.

8. The power supply system of claim 5 wherein the second end of a plurality of three pairs of secondary windings and the three-phase input voltage collectively provide a said multi-phase output.

9. A power supply system, comprising:
a three-phase generator configured to generate a three-phase input voltage;
an autotransformer comprising:
three primary windings connected in a delta configuration and configured to receive the three-phase input voltage, wherein each primary winding of the three primary windings has a respective center tap and a respective plurality of taps having a symmetric arrangement about the center tap; and
a plurality of secondary windings, wherein each secondary winding of the plurality of secondary windings:
is electrically coupled with a predetermined tap of the plurality of taps that corresponds to a predetermined first primary winding of the three primary windings,
is magnetically coupled with a predetermined second primary winding of the three primary windings, and
has a combination of the predetermined tap and the second primary winding that is different than combinations for other secondary windings of the plurality of secondary windings;

one or more buses coupled with the autotransformer and configured to provide a plurality of phase-shifted three-phase outputs and a plurality of multi-phase outputs;
a first rectifier connected to a first bus of the one or more buses, the first bus providing a first multi-phase output of the plurality of multi-phase outputs, the first rectifier configured to provide a first direct current (DC) output; and
a second rectifier connected to a second bus of the one or more buses, the second bus providing a second multi-phase output of the plurality of multi-phase outputs, the second rectifier configured to provide a second DC output that is different than the first DC output.

10. The power supply system of claim 9 , wherein one or both of the first rectifier and the second rectifier comprises an 18-pulse rectifier.

11. The power supply system of claim 9 , wherein the center taps corresponding to the three primary windings provide a first phase-shifted three-phase output of the plurality of phase-shifted three-phase outputs.

12. The power supply system of claim 11 , wherein the plurality of taps having a symmetric arrangement about the center tap comprises:
a first tap disposed on a first side of the center tap; and
a second tap disposed on an opposing second side of the center tap,
wherein a second phase-shifted three-phase output of the plurality of phase-shifted three-phase outputs is provided via the first taps corresponding to the three primary windings, and
wherein a third phase-shifted three-phase output of the plurality of phase-shifted three-phase outputs is provided via the second taps corresponding to the three primary windings.

13. The power supply system of claim 12 ,
wherein for each primary winding of the three primary windings:
a first secondary winding of the plurality of secondary windings defines a first end coupled with the first tap, and further defines an opposing second end, and
a second secondary winding of the plurality of secondary windings defines a third end coupled with the second tap, and further defines an opposing fourth end,

wherein the second phase-shifted three-phase output is provided at the second ends corresponding to the three primary windings, and
wherein the third phase-shifted three-phase output is provided at the fourth ends corresponding to the three primary windings.

14. The power supply system of claim 12 , wherein the first tap and the second tap are each arranged with a distance from the center tap that is one-third a distance between the center tap and an end of the primary winding.

15. The power supply system of claim 12 , wherein a first multi-phase output of the plurality of multi-phase outputs is provided by the center taps, first taps, and second taps corresponding to the three primary windings.

16. The power supply system of claim 12 , wherein the plurality of taps having a symmetric arrangement about the center tap comprises:
a third tap disposed between the first tap and a first end of the primary winding; and
a fourth tap disposed between the second tap and a second end of the primary winding,
wherein a third phase-shifted three-phase output of the plurality of phase-shifted three-phase outputs is provided via the third taps corresponding to the three primary windings, and
wherein a fourth phase-shifted three-phase output of the plurality of phase-shifted three-phase outputs is provided via the fourth taps corresponding to the three primary windings.

17. The power supply system of claim 16 ,
wherein a first multi-phase output of the plurality of multi-phase outputs is provided by the center taps, first taps, and second taps corresponding to the three primary windings, and
wherein a second multi-phase output of the plurality of multi-phase outputs is provided by the third taps and the fourth taps corresponding to the three primary windings.

18.

Assignees

• Boeing Co

Inventors

• Huang Jian
• Solodovnik Eugene V
• Karimi Kamiar J

Classifications

• H01F27/29

  Terminals; Tapping arrangements {for signal inductances} · CPC title

• H01F30/12 Primary

  Two-phase, three-phase or polyphase transformers · CPC title

• H05K7/20927

  Liquid coolant without phase change · CPC title

• H02M7/04 Primary

  by static converters · CPC title

• H01F30/02

  Auto-transformers · CPC title