US3780361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for an inverter including a controlled thyristor in an intermediate direct current circuit
Assignee: Siemens AG
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Filing: 1972-02-22
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Granted: 1973-12-18
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Expires: 1992-02-22
Abstract
Abstract In current converter motors, signals dependent on the rotor positions are applied to a synchronized and self-resettable timing circuit arrangement for the timed activation of a controlled thyristor. A shift in the blocking period of the rectifier toward the cycle-cutoff of the controlled inverter is also effected thereby. A mean effective value is additionally applied to the current regulating circuit which is derived from the current flowing through the controlled thyristor.
Inventors
- 👤 H Poppinger
- 👤 K Hubner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:43
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/45; H02M5/4505; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/03
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
In a circuit for energizing a synchronous motor which includes a rectifier circuit for converting the A.C. from a supply source to D.C., an inverter circuit connected to be supplied from said rectifier circuit for inverting the D.C. into A.C.; a synchronous motor connected to be supplied from said inverter circuit having a rotor, and a D.C. circuit intermediate said rectifier and inverter circuits including a smoothing choke and a controlled thyristor in parallel circuit solely with said choke; a circuit for controlling said thyristor comprising means for deriving a signal in response to the angular position of said rotor, a timing signal generating means, means for applying the output of said deriving means to said timing means and to said inverter circuit, means for deriving synchronizing signals from the A.C. supply source connected to apply said synchronizing signals to said timing means, means for applying the signals of said timing means to said thyristor and second means for deriving a signal from said timing means for effecting a restoration thereof, means for controlling said rectifier, and means for applying the signals of said timing circuit to said last named controlling means for regulating the phase angle of operation thereof.
Claim 2
Dependent Claim
200 words
In a circuit for energizing a synchronous motor which includes a rectifier circuit for converting the A.C. from a supply source to D.C., an inverter circuit connected to be supplied from said rectifier circuit for inverting the D.C. into A.C.; a synchronous motor connected to be supplied from said inverter circuit having a rotor, and a D.C. circuit intermediate said rectifier and inverter circuits including a smoothing choke and a controlled thyristor in parallel circuit solely with said choke; a circuit for controlling said thyristor comprising means for deriving a signal in response to the angular position of said rotor, a timing signal generating means, means for applying the output of said deriving means to said timing means and to said inverter circuit, means for deriving synchronizing signals from the A.C. supply source connected to apply said synchronizing signals to said timing means, means for applying the signals of said timing means to said thyristor and second means for deriving a signal from said timing means for effecting a restoration thereof, means for controlling said rectifier, and means for applying the signals of said timing circuit to said last named controlling means for regulating the phase angle of operation thereof.
Claim 3
Dependent Claim
34 words
The circuit according to claim 1, further including circuit switching means for said timing means, and means for activating said circuit switching means in response to a given rate of rotation of said rotor.
Claim 4
Dependent Claim
45 words
The circuit according to claim 1 further including means for applying a current to said rectifier controlling means which is proportional to the mean effective value of the current through said thyristor and to the current of the source of supply for said rectifier-inverter circuit.
Claim 5
Dependent Claim
57 words
The circuit according to claim 3, further including means for deriving a first rectified potential corresponding to the current through said thyristor and a second rectified potential corresponding to respective phase potentials of said supply, means for comparing said rectified potentials, and means for obtaining synchronizing pulse signals from said comparing means for controlling said timing circuit.
Claim 6
Dependent Claim
112 words
The circuit according to claim 2, wherein said timing signal generating means includes a first monostable timing circuit controlled by said rotor position signal generator, and means for restoring said first timing circuit; a second monostable timing circuit, means for controlling said second timing circuit including said first timing circuit, said circuit switching and said switching circuit activating means, and said synchronizing signal deriving means; a circuit for differentiating the output timing pulses of said second timing circuit and for applying the resulting signals to said second timing circuit for the restoration thereof; and means for connecting the output of said second timing circuit for controlling said thyristor and said rectifier circuit.
References Cited (Backward Citations)
US3444451A
Cited
US3600658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |