US3893016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyristor chopper circuit
Assignee: ZF International UK Ltd
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Filing: 1974-03-14
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Granted: 1975-07-01
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Expires: 1994-03-14
Abstract
Abstract A thyristor chopper circuit has a load and a main thyristor in series, a second thyristor and a capacitor connected in series across the main thyristor, and an inductor and a third thyristor connected in series across the capacitor. The capacitor charges through the second thyristor, and the charge across it is reversed when the third thyristor conducts. An inductor is provided in series with the capacitor, and the series circuit of third thyristor and inductor is connected across the series circuit of the capacitor and inductor.
Inventors
- 👤 Ivor Carl Rohsler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:37
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/125; H02M3/135; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/913; Y10S388/917; Y10S388/92
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A thyristor chopper circuit comprising in combination first and second d.c. supply lines, a load and a main thyristor connected in series across the supply lines, a second thyristor, a first inductor and a capacitor connected in series across the main thyristor, and a second inductor and a third thyristor connected in series across the series combination of the first inductor and capacitor, firing of the second thyristor commutating the main thyristor and charging the capacitor, and firing of the third thyristor reversing the charge on the capacitor, said first inductor having a saturable core but the second inductor having no core.
Claim 2
Dependent Claim
102 words
A thyristor chopper circuit comprising in combination first and second d.c. supply lines, a load and a main thyristor connected in series across the supply lines, a second thyristor, a first inductor and a capacitor connected in series across the main thyristor, and a second inductor and a third thyristor connected in series across the series combination of the first inductor and capacitor, firing of the second thyristor commutating the main thyristor and charging the capacitor, and firing of the third thyristor reversing the charge on the capacitor, said first inductor having a saturable core but the second inductor having no core.
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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |