US5065303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer-coupled and phase-shifted inverter
Assignee: Sundstrand Corp
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Filing: 1990-07-24
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Granted: 1991-11-12
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Expires: 2010-07-24
Abstract
Abstract A power system in accordance with the present invention includes a first inverter and a second inverter, a first transformer having a primary coupled to an output of the first inverter and a secondary coupled only magnetically to the primary of the first transformer; a second transformer having a primary coupled to the output of the second inverter and a secondary coupled only magnetically to the primary of the second transformer; a controller and a number of series circuits equal to the number of phases, each series circuit comprising the secondary windings of a corresponding phase of each transformer with a first terminal of each series circuit being coupled to a reference potential and a second terminal being a phase output for the power system.
Inventors
- 👤 Vietson M. Nguyen
- 👤 Chai-Nam Ng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:47
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/483; H02M7/49
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
361 words
A power system comprising: a first inverter having a plurality of switches which are switched between on and off states by control signals applied to switch control terminals to produce at least one output phase; a second inverter having a plurality of switches which are switched between on and off states by control signals applied to switch control terminals to produce at least one output phase; a first transformer having a primary coupled to each output phase of the first inverter with a number of primary windings equal to a number of output phases produced by the first inverter and each primary winding of the first transformer being coupled to a different phase output of the first inverter and a secondary coupled only magnetically to the primary of the first transformer with a number of secondary windings being equal to the number of primary windings and each secondary winding being coupled to a different primary winding; a second transformer having a primary coupled to each output phase of the second inverter with a number of primary windings equal to the number of output phases produced by the first inverter and each primary winding of the second transformer being coupled to a different phase output of the second inverter and a secondary coupled only magnetically to the primary of the second transformer with a number of secondary windings of the second transformer being equal to the number of primary windings of the second transformer and each secondary winding being coupled to a different primary winding; a controller producing the control signals for the switches which cause a fundamental frequency of alternating current produced by each phase of the first inverter to be phase displaced from a corresponding fundamental frequency of alternating current produced by each phase of the second inverter by a predetermined phase displacement; and a number of series circuits equal to the number of phases, each series circuit comprising secondary windings from a corresponding phase of each transformer coupled to a different phase output with a first terminal of each series circuit being coupled to a reference potential and a second terminal being a phase output for the power system.
Claim 2
Dependent Claim
361 words
A power system comprising: a first inverter having a plurality of switches which are switched between on and off states by control signals applied to switch control terminals to produce at least one output phase; a second inverter having a plurality of switches which are switched between on and off states by control signals applied to switch control terminals to produce at least one output phase; a first transformer having a primary coupled to each output phase of the first inverter with a number of primary windings equal to a number of output phases produced by the first inverter and each primary winding of the first transformer being coupled to a different phase output of the first inverter and a secondary coupled only magnetically to the primary of the first transformer with a number of secondary windings being equal to the number of primary windings and each secondary winding being coupled to a different primary winding; a second transformer having a primary coupled to each output phase of the second inverter with a number of primary windings equal to the number of output phases produced by the first inverter and each primary winding of the second transformer being coupled to a different phase output of the second inverter and a secondary coupled only magnetically to the primary of the second transformer with a number of secondary windings of the second transformer being equal to the number of primary windings of the second transformer and each secondary winding being coupled to a different primary winding; a controller producing the control signals for the switches which cause a fundamental frequency of alternating current produced by each phase of the first inverter to be phase displaced from a corresponding fundamental frequency of alternating current produced by each phase of the second inverter by a predetermined phase displacement; and a number of series circuits equal to the number of phases, each series circuit comprising secondary windings from a corresponding phase of each transformer coupled to a different phase output with a first terminal of each series circuit being coupled to a reference potential and a second terminal being a phase output for the power system.
Claim 3
Dependent Claim
15 words
A power system in accordance with claim 1 wherein: the power supply three phase outputs.
Claim 4
Dependent Claim
21 words
A power system in accordance with claim 2 wherein: the primary windings of the transformers are connected in a delta configuration.
Claim 5
Dependent Claim
21 words
A power system in accordance with claim 2 wherein: the primary of the transformers are each connected in a star configuration.
Claim 6
Dependent Claim
47 words
A power system in accordance with claim 1 further comprising: a pair of DC potentials coupled to the inverters for providing the DC potentials which are switched by the switches and a regulated DC output with one of the DC potentials being connected to the reference potential.
Claim 7
Dependent Claim
47 words
A power system in accordance with claim 2 further comprising: a pair of DC potentials coupled to the inverters for providing the DC potentials which are switched by the switches and a regulated DC output with one of the DC potentials being connected to the reference potential.
Claim 8
Dependent Claim
47 words
A power system in accordance with claim 3 further comprising: a pair of DC potentials coupled to the inverters for providing the DC potentials which are switched by the switches and a regulated DC output with one of the DC potentials being connected to the reference potential.
Claim 9
Dependent Claim
47 words
A power system in accordance with claim 4 further comprising: a pair of DC potentials coupled to the inverters for providing the DC potentials which are switched by the switches and a regulated DC output with one of the DC potentials being connected to the reference potential.
Claim 10
Dependent Claim
39 words
A power system in accordance with claim 5 wherein: the regulated DC and each output phase are respectively connected to electrical loads in an airframe which are powered by DC and AC and the reference potential is a neutral.
Claim 11
Dependent Claim
39 words
A power system in accordance with claim 6 wherein: the regulated DC and each output phase are respectively connected to electrical loads in an airframe which are powered by DC and AC and the reference potential is a neutral.
Claim 12
Dependent Claim
39 words
A power system in accordance with claim 7 wherein: the regulated DC and each output phase are respectively connected to electrical loads in an airframe which are powered by DC and AC and the reference potential is a neutral.
Claim 13
Dependent Claim
39 words
A power system in accordance with claim 8 wherein: the regulated DC and each output phase are respectively connected to electrical loads in an airframe which are powered by DC and AC and the reference potential is a neutral.
Claim 14
Dependent Claim
43 words
A power system in accordance with claim 5 wherein: the controller pulse width modulates the control signals applied to the switches to maintain a regulated potential of each phase output of the system while maintaining the predetermined phase displacement to cancel undesired harmonics.
Claim 15
Dependent Claim
43 words
A power system in accordance with claim 6 wherein: the controller pulse width modulates the control signals applied to the switches to maintain a regulated potential of each phase output of the system while maintaining the predetermined phase displacement to cancel undesired harmonics.
Claim 16
Dependent Claim
43 words
A power system in accordance with claim 7 wherein: the controller pulse width modulates the control signals applied to the switches to maintain a regulated potential of each phase output of the system while maintaining the predetermined phase displacement to cancel undesired harmonics.
Claim 17
Dependent Claim
43 words
A power system in accordance with claim 8 wherein: the controller pulse width modulates the control signals applied to the switches to maintain a regulated potential of each phase output of the system while maintaining the predetermined phase displacement to cancel undesired harmonics.
Claim 18
Dependent Claim
45 words
A power system in accordance with claim 9 wherein: the controller pulse width modulates the control signals applied to the switches to maintain a regulated potential of each phase output of the of the system while maintaining the predetermined phase displacement to cancel undesired harmonics.
Claim 19
Dependent Claim
43 words
A power system in accordance with claim 10 wherein: the controller pulse width modulates the control signals applied to the switches to maintain a regulated potential of each phase output of the system While maintaining the predetermined phase displacement to cancel undesired harmonics.
Claim 20
Dependent Claim
45 words
A power supply in accordance with claim 11 wherein: the controller pulse width modulates the control signals applied to the switches to maintain a regulated potential of each phase output of the of the system while maintaining the predetermined phase displacement to cancel undesired harmonics.
Claim 21
Dependent Claim
43 words
A power system in accordance with claim 12 wherein: the controller pulse width modulates the control signals applied to the switches to maintain a regulated potential of each phase output of the system while maintaining the predetermined phase displacement to cancel undesired harmonics.
Claim 22
Dependent Claim
231 words
In an electrical power system having first and second inverters which produce at least one output phase, corresponding phase outputs having a predetermined phase displacement that are combined for cancelling harmonics of a fundamental frequency of AC from a phase output, the improvement comprising: a first transformer having a number of primary windings equal in number to a number of output phases, each primary windings being coupled to a different output phase of the first inverter and a number of secondary windings being equal to a number of primary windings, each secondary winding being coupled only magnetically to a different primary winding of the first transformer winding; a second transformer having a number of primary windings equal in number to a number of output phases, each primary windings being coupled to a different output phase of the second inverter and a number of secondary windings being equal to a number of primary windings, each secondary winding being coupled only magnetically to a different primary winding of the second transformer; and a number of series circuits equal to a number of the output phases of the system, each series circuit comprising secondary windings from a corresponding phase of each transformer coupled to a different phase output with a first terminal of each series circuit being coupled to a reference potential and a second terminal being a phase output of the power system.
Claim 23
Dependent Claim
231 words
In an electrical power system having first and second inverters which produce at least one output phase, corresponding phase outputs having a predetermined phase displacement that are combined for cancelling harmonics of a fundamental frequency of AC from a phase output, the improvement comprising: a first transformer having a number of primary windings equal in number to a number of output phases, each primary windings being coupled to a different output phase of the first inverter and a number of secondary windings being equal to a number of primary windings, each secondary winding being coupled only magnetically to a different primary winding of the first transformer winding; a second transformer having a number of primary windings equal in number to a number of output phases, each primary windings being coupled to a different output phase of the second inverter and a number of secondary windings being equal to a number of primary windings, each secondary winding being coupled only magnetically to a different primary winding of the second transformer; and a number of series circuits equal to a number of the output phases of the system, each series circuit comprising secondary windings from a corresponding phase of each transformer coupled to a different phase output with a first terminal of each series circuit being coupled to a reference potential and a second terminal being a phase output of the power system.
Claim 24
Dependent Claim
16 words
A power system in accordance with claim 21 wherein: the power system has three phase outputs.
Claim 25
Dependent Claim
22 words
A power generating system in accordance with claim 21 wherein: the primary windings of each transformer are connected in a delta configuration.
Claim 26
Dependent Claim
22 words
A power generating system in accordance with claim 21 wherein: the primary windings of each transformer are connected in a star configuration.
Claim 27
Dependent Claim
75 words
A power generating system in accordance with claim 21 further comprising: a pair of DC potentials coupled to the inverters for providing DC potentials which are switched by switches of the inverters to produce AC and a regulated DC output with one of the DC potentials being connected to the reference potential; and wherein the reference potential is ground in an airframe and is a neutral coupled to the phase outputs of the power system.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |