US3906314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for regulating and switching currents from a constant D.C. source into the windings of an A.C. machine
Assignee: Jeumont Schneider SA
•
Filing: 1974-01-18
•
Granted: 1975-09-16
•
Expires: 1994-01-18
Abstract
Abstract A system for the control and commutation of current from a D.C. source into the windings of a polyphase A.C. machine. Terminals are provided for connecting the system in series with terminals of a D.C. source. A single current chopper is connected to the current source and provides D.C. currents adjustable to a given value. A smoothing inductor smoothes the currents from the chopper. A thyristor routing bridge has 2n arms with n mid-points respectively connected to n phase terminals of the A.C. machine. The ends of each of two groups are respectively connected to the smoothing inductor output and a negative terminal of the D.C. source. The bridge is configured and controllable so that D.C. current supplied by the chopper and the smoothing inductor is cyclically routed to the windings of the n phasese of the A.C. machine. A diode commutating bridge having 2n arms with n midpoints respectively connected to the n phase terminals of the A.C. machine is provided. A de-energizing circuit de-energizes the thyristors of the routing bridge and a switching circuit progressively transfers the current from the commutating bridge to the routing bridge. Selectors are provided for isolating certain of said circuits and an auxiliary switching circuit for generator and braking operation of the A.C. machine.
Inventors
- 👤 Albert Wiart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:00
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152; H02P; H02P23/00; H02P23/28; H02P3/00; H02P3/06; H02P3/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
363 words
A system for the control and commutation of current from a D.C. source into the windings of a polyphase A.C. machine including means for connection in series to terminals of a D.C. source comprising, a current chopper providing D.C. currents having a given adjustable value from said source; a smoothing inductor for smoothing the currents from said chopper; a thyristor routing bridge having 2n arms with n mid-points respectively connected to n phase terminals of the A.C. machine, the ends of each of two groups being respectively connected to the smoothing inductor output and a negative terminal of the source, the bridge being configured and controllable so that the adjustable D.C. current supplied by the chopper and smoothing inductor is cyclically routed to windings of the n phases of the A.C. machine; a diode commutating bridge having 2n arms, with n mid-points respectively connected to the n phase terminals of the A.C. machine; a circuit for de-energizing the thyristors of the routing bridge; a switching circuit for progressively transferring the current from the commutating bridge to the routing bridge; the ends of each of the two groups of said commutating bridge being connected to said circuit for deenergizing the thyristors of the routing bridge and to said switching circuit for progressively transferring the current from the commutating bridge to the routing bridge; said circuit for de-energizing the thyristors comprising two subcircuits for each de-energizing a group of thyristors of the routing bridge connected between a unit and the corresponding group of the commutating bridge; a capacitor connected in common with said two sub-circuits; said switching circuit comprising a circuit for each group of diodes of the commutating bridge connected between a terminal of the source and the commutating bridgE; selectors for isolating certain of said circuits and an auxiliary switching circuit for generator and braking operation of the machine; an auxiliary switching circuit connected to the terminals of said capacitor common to the two sub-circuits for de-energizing the thyristors of the routing bridge, and comprising a diode bridge having a diagonal including a capacitor and an auxiliary chopper shunting said capacitor for maintaining a constant voltage at the terminals of the second-mentioned capacitor.
Claim 2
Independent Claim
363 words
A system for the control and commutation of current from a D.C. source into the windings of a polyphase A.C. machine including means for connection in series to terminals of a D.C. source comprising, a current chopper providing D.C. currents having a given adjustable value from said source; a smoothing inductor for smoothing the currents from said chopper; a thyristor routing bridge having 2n arms with n mid-points respectively connected to n phase terminals of the A.C. machine, the ends of each of two groups being respectively connected to the smoothing inductor output and a negative terminal of the source, the bridge being configured and controllable so that the adjustable D.C. current supplied by the chopper and smoothing inductor is cyclically routed to windings of the n phases of the A.C. machine; a diode commutating bridge having 2n arms, with n mid-points respectively connected to the n phase terminals of the A.C. machine; a circuit for de-energizing the thyristors of the routing bridge; a switching circuit for progressively transferring the current from the commutating bridge to the routing bridge; the ends of each of the two groups of said commutating bridge being connected to said circuit for deenergizing the thyristors of the routing bridge and to said switching circuit for progressively transferring the current from the commutating bridge to the routing bridge; said circuit for de-energizing the thyristors comprising two subcircuits for each de-energizing a group of thyristors of the routing bridge connected between a unit and the corresponding group of the commutating bridge; a capacitor connected in common with said two sub-circuits; said switching circuit comprising a circuit for each group of diodes of the commutating bridge connected between a terminal of the source and the commutating bridgE; selectors for isolating certain of said circuits and an auxiliary switching circuit for generator and braking operation of the machine; an auxiliary switching circuit connected to the terminals of said capacitor common to the two sub-circuits for de-energizing the thyristors of the routing bridge, and comprising a diode bridge having a diagonal including a capacitor and an auxiliary chopper shunting said capacitor for maintaining a constant voltage at the terminals of the second-mentioned capacitor.
Claim 3
Dependent Claim
68 words
A system according to claim 1, wherein the circuit for de-energizing the two groups of routing bridge thyristors includes two pairs of thyristors and a capacitor, means connecting one pair of thyristors in series across the ends of the routing bridge and means connecting the other pair of thyristors in series across said commutating bridge, means connecting the capacitor across junction points of the two pairs of thyristors.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |