Patent USH335H successfully refreshed from Google Patents.
USH335H
Expired / Lapsed
US
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Converter
Assignee: United States Department of the Army
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Filing: 1987-03-27
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Granted: 1987-09-01
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Expires: 2007-03-27
Abstract
Abstract An electrical power converter comprising two current-fed square wave chops the outputs of which are combined and rectified to yield a variable and regulated output voltage. The phase relationship of the choppers are varied to achieve output voltage control and regulation. The chopper outputs are combined in such a way that the choppers never experience the open-circuit inductance of their output transformers. This enhances frequency agility. A novel choke feed system is provided in which the choke flyback energy is absorbed and then transferred to the input of the other chopper.
Inventors
- 👤 Walter E. Milberger
- 👤 Donald C. Lewns
- 👤 David E. Bulgher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:23
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/285
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
An electrical power converter comprising; two current fed square wave choppers the phase relationships of which may be varied over 180 degrees to achieve output voltage control and regulation, means to drive one of said choppers by means of an amplified square wave clock signal and means to drive the other of said choppers with an amplified and variable-phase version of the said clock signal, means to combine the outputs of said choppers by means of two series-connected windings of two different transformers, the primaries of which are driven by said choppers, said series-connected windings being connected to a full-wave bridge rectifier which provides the converter output.
Claim 2
Dependent Claim
107 words
An electrical power converter comprising; two current fed square wave choppers the phase relationships of which may be varied over 180 degrees to achieve output voltage control and regulation, means to drive one of said choppers by means of an amplified square wave clock signal and means to drive the other of said choppers with an amplified and variable-phase version of the said clock signal, means to combine the outputs of said choppers by means of two series-connected windings of two different transformers, the primaries of which are driven by said choppers, said series-connected windings being connected to a full-wave bridge rectifier which provides the converter output.
Claim 3
Dependent Claim
76 words
The converter of claim 1 further comprising; a current limiting choke feed system with an energy recovery feature, comprising; separate current-limiting chokes in series with the inputs of both of said choppers, a series diode-capacitor connected across said choppers in such a way that the flyback voltage generated across said chokes will be absorbed by the said capacitors, and means to transfer the energy so absorbed to the input of the opposite one of said choppers.
Claim 4
Dependent Claim
11 words
The converter of claim 1 wherein said choppers comprise half-bridge circuits.
Claim 5
Dependent Claim
105 words
An electrical power converter comprising; a reference phase chopper and a control phase chopper, the phase relationships of which may be varied to achieve output voltage control and regulation, a fixed-phase drive signal connected to said control phase chopper, each of said choppers having its output connected to the primary of an output transformer, said output transformers having one or more secondary windings, means to connect said secondary windings to each other and to rectifier means in such a way that load current is constantly flowing through all of said secondary windings, whereby said choppers never experience the open circuit inductance of said output transformers.
Claim 6
Dependent Claim
105 words
An electrical power converter comprising; a reference phase chopper and a control phase chopper, the phase relationships of which may be varied to achieve output voltage control and regulation, a fixed-phase drive signal connected to said control phase chopper, each of said choppers having its output connected to the primary of an output transformer, said output transformers having one or more secondary windings, means to connect said secondary windings to each other and to rectifier means in such a way that load current is constantly flowing through all of said secondary windings, whereby said choppers never experience the open circuit inductance of said output transformers.
Claim 7
Dependent Claim
55 words
The converter of claim 4 wherein each of said output transformers comprise two secondaries and said rectifier means comprises two diodes, and wherein pairs of said secondaries are each connected in series and to a different one of said rectifier diodes, and wherein said pairs each comprise one winding from each of said output transformers.
Claim 8
Dependent Claim
88 words
A choke feed system for an electrical converter which comprises two square wave choppers both of which convert an input dc B+ voltage to an alternating voltage, comprising; separate current-limiting chokes in series with the inputs of both said choppers, a series diode and capacitor connected across each of said choppers in such a way that the flyback voltage generated across said chokes will be absorbed by said capacitors, and means to transfer the flyback energy so absorbed to the input of the other one of said choppers.
Claim 9
Dependent Claim
88 words
A choke feed system for an electrical converter which comprises two square wave choppers both of which convert an input dc B+ voltage to an alternating voltage, comprising; separate current-limiting chokes in series with the inputs of both said choppers, a series diode and capacitor connected across each of said choppers in such a way that the flyback voltage generated across said chokes will be absorbed by said capacitors, and means to transfer the flyback energy so absorbed to the input of the other one of said choppers.
Claim 10
Dependent Claim
32 words
The choke free system of claim 6 wherein said last-named means comprises inductors connected from the junctions of said diodes and capacitors to the input of the opposite one of said choppers.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |