US4685049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unrestricted frequency changer switch topology
Assignee: AEG Westinghouse Industrial Automation Corp
•
Filing: 1986-07-22
•
Granted: 1987-08-04
•
Expires: 2006-07-22
Abstract
Abstract The N converters of a UFC bridge system interconnecting an N-phase voltage source to N output loads, comprise each N bilateral switches connected to one end of the associated output load and (N-1) bilateral switches connected to the other end thereof. The (N-1) bilateral switches of the respective converters build up a polygonal assembly between the output loads which is selectively connected to the respective phases of the voltage source by selective control of the N groups of N switches and of the (N-1) groups of switches.
Inventors
- 👤 Charles L. Neft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:47
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/27; H02M5/271
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
201 words
In a UFC bridge system including a plurality of bilateral power switches operated in a repetitive switching pattern at a selected repetition rate to apply successive increments of alternating voltage from a N-phase voltage source to supply N output loads with current at an output frequency which is a function of the difference between the input frequency and said repetition rate, the combination of: N groups of N of said switches, each of said N groups being associated with one end of a corresponding one of said N output loads and with the respective N phases of said voltage source; N groups of (N-1) additional said switches, each of said (N-1) additional switches being connected to a corresponding said one end for an output load belonging to the (N-1) other groups of N switches, and each of said N groups of (N-1) additional switches being associated with the other end of a corresponding one of said N output loads; whereby said output loads form through said (N-1) additional switches a polygonal assembly of said output loads, and said polygonal assembly is connected selectively to the respective phases of said voltage source by selective control of said N groups of N switches.
Claim 2
Dependent Claim
201 words
In a UFC bridge system including a plurality of bilateral power switches operated in a repetitive switching pattern at a selected repetition rate to apply successive increments of alternating voltage from a N-phase voltage source to supply N output loads with current at an output frequency which is a function of the difference between the input frequency and said repetition rate, the combination of: N groups of N of said switches, each of said N groups being associated with one end of a corresponding one of said N output loads and with the respective N phases of said voltage source; N groups of (N-1) additional said switches, each of said (N-1) additional switches being connected to a corresponding said one end for an output load belonging to the (N-1) other groups of N switches, and each of said N groups of (N-1) additional switches being associated with the other end of a corresponding one of said N output loads; whereby said output loads form through said (N-1) additional switches a polygonal assembly of said output loads, and said polygonal assembly is connected selectively to the respective phases of said voltage source by selective control of said N groups of N switches.
Claim 3
Dependent Claim
65 words
The system of claim 1, wherein one switch in each of said N groups of N switches is controlled for conduction, and one switch in each of said N groups of (N-1) switches is controlled for conduction concurrently therewith; whereby such one switch among (N-1) switches closes a current path through a corresponding load between one pair of switches of different groups of N switches.
Claim 4
Dependent Claim
79 words
The system of claim 2 with the switches of one N switch group and the switches of an (N-1) switch group relating to a common one of said loads being controlled as one AC converter between said AC voltage source and such load; each of said converters being operated in relation to the associated load for connection between one switch of the N switch group of such converter and one switch of the N switch group of another converter.
Claim 5
Dependent Claim
110 words
The system of claim 3 with each of said converters being controlled in parallel to establish conduction of said N group of switches in succession during a time period characterizing the frequency f o of the AC power to the loads; each switch having a controllable conduction time interval (t) within a common time frame (T) defined by a controllable repetition rate; thereby to derive energy from said AC voltage source through the associated converters during successive segments of voltage, on a phase basis, and to apply the derived voltage segments of said succession to said loads, so as to form with the associated converter switches an AC polyphase load.
Claim 6
Dependent Claim
27 words
The system of claim 4 with said time interval of conduction being defined by a complementary time of short-circuiting said loads during such common time frame (T).
Claim 7
Dependent Claim
34 words
The system of claim 5 wherein said short-circuiting is effected by turning OFF the switches of the associated N group of switches and by turning ON concurrently all switches of said (N-1) switch groups.
Claim 8
Dependent Claim
43 words
The system of claim 5 wherein said short-circuiting is effected by turning ON all the switches associated with the same input phase in said groups of N switches, and by turning ON at least one switch in each of said (N-1) switch groups.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |