US4236201A
Expired / Lapsed
US
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Inverter device
Assignee: Toshiba Corp
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Filing: 1978-10-24
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Granted: 1980-11-25
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Expires: 1998-10-24
Abstract
Abstract A pair of switching elements are provided between a source of direct current and a bridge type inverter for commutating together. A commutating circuit having a capacitor is connected in parallel with the bridge type inverter to rapidly commutate the bridge type inverter. The commutating circuit operates so as to apply a voltage of inverse polarity to the thyristor of the inverter when a switching element operates.
Inventors
- 👤 Chihiro Okado
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:39
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
An inverter device comprising: a bridge type inverter circuit; means for connecting the bridge type inverter circuit between a source of direct current and a load; a bridge type diode circuit connected in parallel with the bridge type inverter circuit; a pair of switching means connected between the bridge type inverter circuit and the bridge type diode circuit; and a commutating circuit including a series circuit of a first diode, a capacitor, a second diode and means for limiting current supplied to said capacitor connected in parallel with the bridge type inverter circuit, a first switch element connected in parallel with the first diode and the capacitor and a second switch element connected in parallel with the capacitor and the second diode for applying electric charge stored in the capacitor to the inverter circuit with reverse polarity when the inverter circuit is commutated.
Claim 2
Dependent Claim
143 words
An inverter device comprising: a bridge type inverter circuit; means for connecting the bridge type inverter circuit between a source of direct current and a load; a bridge type diode circuit connected in parallel with the bridge type inverter circuit; a pair of switching means connected between the bridge type inverter circuit and the bridge type diode circuit; and a commutating circuit including a series circuit of a first diode, a capacitor, a second diode and means for limiting current supplied to said capacitor connected in parallel with the bridge type inverter circuit, a first switch element connected in parallel with the first diode and the capacitor and a second switch element connected in parallel with the capacitor and the second diode for applying electric charge stored in the capacitor to the inverter circuit with reverse polarity when the inverter circuit is commutated.
Claim 3
Dependent Claim
19 words
An inverter device according to claim 1, wherein: each of the first and second switch elements is a transistor.
Claim 4
Dependent Claim
32 words
An inverter device according to claim 1, wherein the commutating circuit further includes: a third diode; and a reserved D.C. power source connected in parallel with the capacitor through the third diode.
Claim 5
Dependent Claim
49 words
An inverter device according to claim 1, wherein: the first and second switch elements are replaced by resistors; and the resistance value of the current limiting element which is connected in series with the series circuit of the commutating circuit is equal or smaller than that of the resistors.
Claim 6
Dependent Claim
102 words
An inverter device according to claim 1, wherein: the commutating circuit is connected between a junction of the source of direct current and one of the switching means and a junction of the other switching means and the inverter and includes a series circuit of a first diode, a capacitor and a second diode, a first switch element connected in parallel with the capacitor and the second diode, and a second switch element connected between the junction of the capacitor and the second diode and the junction of the one of the switching elements and the inverter through a current limiting element.
Claim 7
Dependent Claim
18 words
An inverter device according to claim 1, wherein: each of the pair of switching means is a transistor.
Claim 8
Dependent Claim
18 words
An inverter device according to claim 1, including: a clipping circuit connected in parallel with the commutating circuit.
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) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |