US3872364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extinguishing arrangement for the inverters of an electric motor
Assignee: Siemens AG
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Filing: 1973-09-20
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Granted: 1975-03-18
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Expires: 1993-09-20
Abstract
Abstract An improved arrangement for extinguishing the inverter thyristors supplying current to an electric motor in which the output of the intermediate DC link supplying the inverter has placed across it two controlled rectifiers and a reversing choke along with a commutating capacitor connected in parallel with the reversing choke and one of the control rectifiers thereby permitting the motor current to be commutated even at operating speeds slightly above zero without the need for expensive circuitry.
Inventors
- 👤 Klaus Hubner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:47
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/45; H02M5/4505; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/024; H02P25/03
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
145 words
In a system including an electric machine coupled to an intermediate link converter including an inverter and control means associated therewith, an improved auxiliary extinguishing arrangement for inverter rectifiers of the inverter comprising: a. a first controlled rectifier and a commutation capacitor in series across the intermediate link; b. a second controlled rectifier and a reversing choke connected in series, with the series combination of said second controlled rectifier and said choke in parallel with said commutation capacitor; c. the control means associated with said inverter providing firing pulses thereto; and d. a first voltage detector arranged to detect the voltage at said capacitor, said voltage detector having an output coupled to said control means, said control means being responsive to be enabled by the output of said first voltage detector to permit firing pulses to be provided to the controlled rectifiers in said converter.
Claim 2
Dependent Claim
145 words
In a system including an electric machine coupled to an intermediate link converter including an inverter and control means associated therewith, an improved auxiliary extinguishing arrangement for inverter rectifiers of the inverter comprising: a. a first controlled rectifier and a commutation capacitor in series across the intermediate link; b. a second controlled rectifier and a reversing choke connected in series, with the series combination of said second controlled rectifier and said choke in parallel with said commutation capacitor; c. the control means associated with said inverter providing firing pulses thereto; and d. a first voltage detector arranged to detect the voltage at said capacitor, said voltage detector having an output coupled to said control means, said control means being responsive to be enabled by the output of said first voltage detector to permit firing pulses to be provided to the controlled rectifiers in said converter.
Claim 3
Dependent Claim
60 words
The invention according to claim 1 and further including a second voltage detector arranged to sense the voltage at said first controlled rectifier and means responsive to said seconD voltage detector to provide firing pulses to said second controlled rectifier, said second voltage detector arranged to have an output when a reverse voltage is present at said first controlled rectifier.
Claim 4
Dependent Claim
53 words
The invention according to claim 2 and further including means to generate a firing pulse for said first controlled rectifier, the output of said means being further provided as an input to said control means said control means including means to block firing outputs to the inverter therefrom in response to said input.
Claim 5
Dependent Claim
34 words
The invention according to claim 3 and further including an auxiliary DC voltage source coupled to said capacitor through a resistor and diode, said auxiliary voltage source providing for initial charging of said capacitor.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |