# US 10,312,017 B2 · Symmetrical step-up and step-down autotransformer delta topology > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,312,017 B2 - Document ID: US10312017B2 - Status: Granted - Kind: B2 - Application number: 15/423,434 - Filed: 2017-02-02 - Published: 2017-05-25 - Granted: 2019-06-04 - Earliest claimed: 2014-07-11 - Assignees: The Boeing Company - Applicants: The Boeing Company - Inventors: Jian Huang; Eugene V. Solodovnik; Kamiar J. Karimi - Web page: https://patentgrep.com/patent/US10312017B2 ## CPC - H02M 7/04: by static converters - H01F 27/29: Terminals; Tapping arrangements {for signal inductances} - H01F 30/02: Auto-transformers - H01F 30/12: Two-phase, three-phase or polyphase transformers - H02M 7/08: arranged for operation in parallel - H05K 7/20927: {Liquid coolant without phase change} - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) 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. ### Claim 4 (depends on 1) The power supply system of claim 1 wherein the center taps collectively provide a said phase-shifted three-phase output. ### Claim 5 (depends on 1) 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. ### Claim 6 (depends on 5) 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. ### Claim 7 (depends on 5) 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. ### Claim 8 (depends on 5) 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. ### Claim 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. ### Claim 10 (depends on 9) The power supply system of claim 9, wherein one or both of the first rectifier and the second rectifier comprises an 18-pulse rectifier. ### Claim 11 (depends on 9) 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. ### Claim 12 (depends on 11) 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. ### Claim 13 (depends on 12) 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. ### Claim 14 (depends on 12) 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. ### Claim 15 (depends on 12) 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. ### Claim 16 (depends on 12) 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. ### Claim 17 (depends on 16) 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. ### Claim 18 A method comprising: determining a combination of an output voltage and an output phase to be provided by an autotransformer, the autotransformer comprising first, second, and third primary windings connected in a delta configuration and configured to receive a three-phase input voltage; determining, for a secondary winding to be electrically coupled to a tap point of the first primary winding, a plurality of induced voltage vectors between the combination and the first primary winding, wherein each induced voltage vector of the plurality of induced voltage vectors corresponds to (i) a respective potential location for the tap point on the first primary winding and (ii) a respective amount of magnetic coupling between the secondary winding with a selected one of the second and third primary windings; and selecting, from the potential locations corresponding to the plurality of induced voltage vectors, a location for the tap point on the first primary winding. ### Claim 19 (depends on 18) The method of claim 18, wherein each of the first, second, and third primary windings has a respective center tap and a respective plurality of taps having a symmetric arrangement about the center tap, and wherein the autotransformer further comprises 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 one primary winding of the three primary windings, is magnetically coupled with a predetermined other primary winding of the three primary windings, and has a combination of the predetermined tap and the other primary winding that is different than combinations for other secondary windings of the plurality of secondary windings.