US3629673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current convertor for dc supply with extinguishing circuit
Assignee: ABB Norden Holding AB
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Filing: 1970-08-17
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Granted: 1971-12-21
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Expires: 1990-08-17
Abstract
Abstract A DC converter for controlling the average value of an intermittent direct current comprises a main thyristor which is ignited with a certain frequency and provided with an extinguishing circuit having an auxiliary thyristor, the ignition of which causes the extinction of the main thyristor. The extinguishing circuit further comprises an oscillating circuit which includes a reactor and a capacitor, which reactor is in series with the main thyristor as well as the auxiliary thyristor.
Inventors
- 👤 Kjeld Thorborg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:54
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/125; H02M3/135; H02M3/137
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
Direct current converter for DC supply of a load, comprising a main thyristor means and an extinguishing circuit for the main thyristor means comprising an oscillating circuit having an auxiliary thyristor means therein, means connecting said main thyristor means and said auxiliary thyristor means in parallel to each other and in series relationship to said load, said oscillating circuit including a reactor means and a capacitor, the reactor means being connected so that its inductance is mutual for the load current through the main thyristor means and the recharging current of the capacitor in the oscillating circuit through the auxiliary thyristor means, and a control means for alternative ignition of the main thyristor means and the auxiliary thyristor means.
Claim 2
Dependent Claim
119 words
Direct current converter for DC supply of a load, comprising a main thyristor means and an extinguishing circuit for the main thyristor means comprising an oscillating circuit having an auxiliary thyristor means therein, means connecting said main thyristor means and said auxiliary thyristor means in parallel to each other and in series relationship to said load, said oscillating circuit including a reactor means and a capacitor, the reactor means being connected so that its inductance is mutual for the load current through the main thyristor means and the recharging current of the capacitor in the oscillating circuit through the auxiliary thyristor means, and a control means for alternative ignition of the main thyristor means and the auxiliary thyristor means.
Claim 3
Dependent Claim
39 words
Direct current converter according to claim 1, said reactor being connected in series with both the main and the auxiliary thyristor means and said capaciTor being connected in parallel with the series-connection of the reactor and the thyristor means.
Claim 4
Dependent Claim
31 words
Direct current converter according to claim 1, in which said reactor means comprises individual windings in series each with one of said thyristor means, the windings being mutually inductively closely connected.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |