US3878451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyristor circuit
Assignee: ABB Norden Holding AB
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Filing: 1973-11-07
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Granted: 1975-04-15
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Expires: 1993-11-07
Abstract
Abstract A thyristor circuit includes a thyristor and a control circuit connected between an input electrode or terminal and the control electrode of the thyristor and fed from the voltage over the thyristor by connection to the voltage across the anode and cathode of the thyristor. This connection is made by a voltage regulator which includes a switch member composed of a transistor and a voltage dependent control member for the switch member which includes a discriminator for assuring a predetermined desired voltage over the control circuit independent of oscillations in the thyristor voltage.
Inventors
- 👤 Bernt Ostlund
- 👤 Lars-Erik Juhlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:24
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/088; H02M1/096
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
Thyristor circuit comprising a thyristor (1), a control circuit (2) having an input terminal (3) and being connected to the control electrode (4) of the thyristor, voltage-regulator means connecting said control circuit with the thyristor circuit across the anode and cathode of the thyristor for supplying the voltage across the thyristor to the control circuit, said voltage-regulator means comprising a switch member (5) for opening and closing the circuit and a control member (6) dependent on the voltage in the control circuit for controlling the switch member, said control member including discriminator means with upper and lower voltage switching levels for providing a predetermined range of voltage in the control circuit independently of oscillations in the thyristor voltage.
Claim 2
Dependent Claim
118 words
Thyristor circuit comprising a thyristor (1), a control circuit (2) having an input terminal (3) and being connected to the control electrode (4) of the thyristor, voltage-regulator means connecting said control circuit with the thyristor circuit across the anode and cathode of the thyristor for supplying the voltage across the thyristor to the control circuit, said voltage-regulator means comprising a switch member (5) for opening and closing the circuit and a control member (6) dependent on the voltage in the control circuit for controlling the switch member, said control member including discriminator means with upper and lower voltage switching levels for providing a predetermined range of voltage in the control circuit independently of oscillations in the thyristor voltage.
Claim 3
Dependent Claim
49 words
Thyristor circuit according to claim 1, in which said voltage regulator means comprises a smoothing circuit comprising a reactor (7) in series with said switch member (5) and the control circuit (2) and a capacitor (8) connected in parallel with said control member (6) and said control circuit (2).
Claim 4
Dependent Claim
80 words
Thyristor circuit according to claim 1, in which the thyristor has connected in parallel with it a capacitive resistive voltage divider (9-12) and in which the control circuit (2) is connected to and fed from a part (9-12) of said voltage divider located nearest to the cathode of the thyristor, said part of the voltage divider comprising a capacitor (10) connected in parallel with a diode (13) having a conducting direction opposite to the conducting direction of the thyristor (1).
Claim 5
Dependent Claim
16 words
Thyristor circuit according to claim 1, in which said switch member (5) is a transistor switch.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |