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US3781635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for converting dc voltage into three-phase voltage
Assignee: Siemens AG
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Filing: 1972-01-18
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Granted: 1973-12-25
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Expires: 1992-01-18
Abstract
Abstract A circuit for converting a DC voltage or a three-phase voltage of variable or constant frequency into a three-phase voltage of a constant other frequency utilizes an intermediate circuit frequency converter. The converter comprises two three-phase thyristor inverters, connected in parallel at the input side. The three-phase outputs of the one three-phase thyristor inverters are connected together via voltage divider chokes. The taps of the voltage divider chokes provide the three outputs of the converter.
Inventors
- 👤 H Sauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:15
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/493; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
219 words
A circuit for converting a DC voltage into a three-phase voltage, said circuit comprising a first three-phase inverter and a second three-phase inverter connected in parallel at their DC voltage inputs; three chokes each comprising of a winding having a tap forming a ratio in the winding and the ratio of each of the tapped choke windings being 1/(1 + square root 3) ; each of the inverters having three phase outputs, each of the phase outputs of the first inverter being electrically connected to a corresponding one of the phase outputs of the second inverter via one of the chokes; the first and second inverters being controlled in a manner to provide rectangular output voltages of equal fundamental frequency and of different curve shape, the output voltage of the first inverter being formed of positive and negative half waves and the output voltage of the second inverter being such that during a rectangular half wave of one phase of the first inverter the corresponding half wave of the corresponding phase of the second inverter at the beginning and prior to the end of the half period duration is switched to the other voltage direction for one-sixth of said time period; and three outputs of the circuit, each connected to the tap of a corresponding one of the chokes.
Claim 2
Dependent Claim
219 words
A circuit for converting a DC voltage into a three-phase voltage, said circuit comprising a first three-phase inverter and a second three-phase inverter connected in parallel at their DC voltage inputs; three chokes each comprising of a winding having a tap forming a ratio in the winding and the ratio of each of the tapped choke windings being 1/(1 + square root 3) ; each of the inverters having three phase outputs, each of the phase outputs of the first inverter being electrically connected to a corresponding one of the phase outputs of the second inverter via one of the chokes; the first and second inverters being controlled in a manner to provide rectangular output voltages of equal fundamental frequency and of different curve shape, the output voltage of the first inverter being formed of positive and negative half waves and the output voltage of the second inverter being such that during a rectangular half wave of one phase of the first inverter the corresponding half wave of the corresponding phase of the second inverter at the beginning and prior to the end of the half period duration is switched to the other voltage direction for one-sixth of said time period; and three outputs of the circuit, each connected to the tap of a corresponding one of the chokes.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |