US3619759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter device
Assignee: Toshiba Corp
•
Filing: 1970-09-28
•
Granted: 1971-11-09
•
Expires: 1990-09-28
Abstract
Abstract A bridge type inverter which has two arms connected in series across a DC power supply. Each of the arms respectively includes first and second thyristor units which are serially connected with the same polarities. A load is provided and is connected between a common connecting point of the arms and an electrically neutral point. The second thyristor units of the two arms are located at positions adjacent to the common connecting point of the two arms and are respectively provided with first and second commutation circuits which are electromagnetically coupled to each other. When it is desired to turn off a presently turned on arm, it is necessary to turn on only the second thyristor unit of the other off arm. At such time, commutation current will flow from the second commutation circuit through the second thyristor unit of the off arm. Commutation current will thereby be induced in the first commutation circuit to turn off the arm which was turned on. In a similar manner the other arm when conducting can be turned off.
Inventors
- 👤 Nagataka Seki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:37
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152; H02M7/5155
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
199 words
An inverter device comprising: A DC voltage supply; two arms which are serially connected in the same conductive polarity across said DC voltage supply, each of said arms having serially connected first and second thyristor units, the second thyristor units being located at positions adjacent to a common connecting point of said two arms; a first commutating circuit which includes a commutating capacitor therein and which is connected in parallel with the second thyristor unit in one of said arms; a second commutating circuit which includes a commutating capacitor therein and which is connected in parallel with the second thyristor unit of the other arm of said two arms; a coupling transformer having a primary coil connected in said first commutating circuit and a secondary coil connected in said second commutating circuit for electromagnetically coupling the first commutating circuit with the second commutating circuit; and, wherein the second thyristor unit of one of said two arms will be selectively turned on when the other of said two arms is turned off and wherein the second thyristor unit in said other of said two arms will be selectively turned on when said one of said two arms is turned off.
Claim 2
Dependent Claim
199 words
An inverter device comprising: A DC voltage supply; two arms which are serially connected in the same conductive polarity across said DC voltage supply, each of said arms having serially connected first and second thyristor units, the second thyristor units being located at positions adjacent to a common connecting point of said two arms; a first commutating circuit which includes a commutating capacitor therein and which is connected in parallel with the second thyristor unit in one of said arms; a second commutating circuit which includes a commutating capacitor therein and which is connected in parallel with the second thyristor unit of the other arm of said two arms; a coupling transformer having a primary coil connected in said first commutating circuit and a secondary coil connected in said second commutating circuit for electromagnetically coupling the first commutating circuit with the second commutating circuit; and, wherein the second thyristor unit of one of said two arms will be selectively turned on when the other of said two arms is turned off and wherein the second thyristor unit in said other of said two arms will be selectively turned on when said one of said two arms is turned off.
Claim 3
Dependent Claim
78 words
An inverter device according to claim 1, wherein said serially connected first and second thyristor units in each of said two arms respectively includes a diode connected in opposite polarity and parallel thereacross, such that a current is caused to flow through the first thyristor unit of a given arm when the electric current flowing through the second thyristor of the same arm becomes zero and for developing a negative bias voltage across the respective second thyristor units.
Claim 4
Dependent Claim
49 words
An inverter device according to claim 1, wherein both the primary and secondary coils of said coupling transformer respectively include a diode connected thereacross for suppressing any oscillatory current which may pass through said first and second commutating circuits after the completion of every commutation between said two arms.
Claim 5
Dependent Claim
51 words
An inverter device according to claim 1, wherein is further included an auxiliary DC voltage supply for said first and second commutating circuits; and wherein said coupling transformer includes a tertiary coil for feeding back any oscillatory energy, which may exist in said commutating circuits, to said auxiliary DC voltage supply.
Claim 6
Dependent Claim
26 words
An inverter device according to claim 1, wherein the leakage inductance of said coupling transformer serves to function as the commutating inductance for said two arms.
Claim 7
Dependent Claim
97 words
An inverter device according to claim 1, which further comprises: an auxiliary DC voltage supply for said first and second commutating circuits; and, an auxiliary thyristor, Said auxiliary thyristor being connected between said auxiliary DC voltage supply and said commutating capacitors such that the commutating capacitors are charged from said auxiliary DC voltage supply through said auxiliary thyristor; and, wherein said auxiliary thyristor is turned on after the completion of a commutation between said two arms to alternatively charge said commutating capacitors and is naturally turned off before the beginning of a commutation between said two arms.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |