US3683267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power control system
Assignee: Mitsubishi Electric Corp
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Filing: 1969-12-01
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Granted: 1972-08-08
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Expires: 1989-12-01
Abstract
Abstract In power control including at least two thyristors disposed between a dc input and an ac output and at least one capacitor interconnecting the thyristors in pair, a nonlinear reactor is serially connected to each thyristor and one of the thyristors is fired to apply a voltage accumulated on the capacitor, to the other thyristor, as a reverse bias, to effect commutation. A diode can be connected to reverse parallel to each thyristor. Also a commutation transformer can be disposed in a path along which the voltage across the capacitor is applied to either of the thyristors.
Inventors
- 👤 Masahiko Akamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:27
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
151 words
A power control system comprising, in combination, a pair of direct current (dc) source terminals, a pair of alternating current (ac) output terminals, first and second series circuits each connected at one end to one of said dc terminals and coupled at their other ends, respectively, to said ac terminals, wherein each said series circuit comprises a semiconductor controlled rectifier and a non-linear reactor, means connecting the other of said dc terminals in a current carrying path with said first and second series circuits, and a pair of semiconductor diodes connected, respectively, in parallel with said controlled rectifiers and in a reverse polarity relationship therewith, a third series circuit comprising a commutation reactor and a commutation capacitor connected at one end to the junction of one of said nonlinear reactors and controlled rectifiers, so that said controlled rectifiers are switched sequentially to provide an ac output voltage at said ac terminals.
Claim 2
Dependent Claim
151 words
A power control system comprising, in combination, a pair of direct current (dc) source terminals, a pair of alternating current (ac) output terminals, first and second series circuits each connected at one end to one of said dc terminals and coupled at their other ends, respectively, to said ac terminals, wherein each said series circuit comprises a semiconductor controlled rectifier and a non-linear reactor, means connecting the other of said dc terminals in a current carrying path with said first and second series circuits, and a pair of semiconductor diodes connected, respectively, in parallel with said controlled rectifiers and in a reverse polarity relationship therewith, a third series circuit comprising a commutation reactor and a commutation capacitor connected at one end to the junction of one of said nonlinear reactors and controlled rectifiers, so that said controlled rectifiers are switched sequentially to provide an ac output voltage at said ac terminals.
Claim 3
Dependent Claim
41 words
A power control system as claimed in claim 1, wherein the other end of said series combination of said commutation capacitor and reactor is connected to the junction of the other of said semiconductor controlled rectifiers and its associated nonlinear reactor.
Claim 4
Dependent Claim
42 words
A power control system as claimed in claim 1, further comprising third and fourth semiconductor diodes connected respectively in parallel with said first and second series circuits and in opposed polarity with the controlled rectifiers in said first and second series circuits.
Claim 5
Dependent Claim
38 words
A power control system as claimed in claim 1, wherein said nonlinear reactors are provided with respective secondary windings and a fourth series combination including a fifth semiconductor diode and a damping resistor connected between said secondary windings.
Claim 6
Dependent Claim
138 words
A power control system comprising, in combination, a pair of direct current (dc) source terminals, a pair of alternating current (ac) output terminals, first and second series circuits each connected at one end, respectively, to said dc terminals and coupled at their other ends to one of said ac terminals, wherein each said series circuit comprises a semiconductor controlled rectifier and a nonlinear reactor, and a pair of semiconductor diodes connected respectively, in parallel with said controlled rectifiers and in a reverse polarity relationship therewith, a commutation circuit including a pair of commutation capacitors, a commutation transformer having first and second magnetically coupled windings, and circuit means for connecting said first and second capacitoRs and windings to said controlled rectifiers for supplying an ac current path to said ac terminals due to alternate switching of said controlled rectifiers.
Claim 7
Dependent Claim
138 words
A power control system comprising, in combination, a pair of direct current (dc) source terminals, a pair of alternating current (ac) output terminals, first and second series circuits each connected at one end, respectively, to said dc terminals and coupled at their other ends to one of said ac terminals, wherein each said series circuit comprises a semiconductor controlled rectifier and a nonlinear reactor, and a pair of semiconductor diodes connected respectively, in parallel with said controlled rectifiers and in a reverse polarity relationship therewith, a commutation circuit including a pair of commutation capacitors, a commutation transformer having first and second magnetically coupled windings, and circuit means for connecting said first and second capacitoRs and windings to said controlled rectifiers for supplying an ac current path to said ac terminals due to alternate switching of said controlled rectifiers.
Claim 8
Dependent Claim
66 words
A power control system as claimed in claim 5, wherein said two commutation capacitors are serially connected across said pair of direct current source terminals, and one of said commutation transformer windings is a tapped winding connected across the junctions of said serially connected semiconductor controlled rectifiers and nonlinear reactors, the junction of said commutation capacitors being connected to the tap on said one transformer winding.
Claim 9
Dependent Claim
92 words
A power control system as claimed in claim 5, wherein said two commutation capacitors are serially connected across said pair of direct current source terminals, and one of said commutation transformer windings is a tapped winding connected across the junctions of said serially connected semiconductor controlled rectifiers and nonlinear reactors, the junction of said commutation capacitors being connected to the tap on said one transformer winding, and wherein a semiconductor diode and a control resistor are connected in series across the junctions of said serially connected semiconductor controlled rectifiers and nonlinear reactors.
Claim 10
Dependent Claim
34 words
A power control system as claimed in claim 5, wherein said commutation transformer further includes a third winding and a third semiconductor diode connected in series across said pair of direct current source terminals.
Claim 11
Dependent Claim
28 words
A power control system as claimed in claim 5, further comprising magnetic coupling means for interlinking said first and second transformer windings and said first and second reactors.
Claim 12
Dependent Claim
47 words
A power control system as claimed in claim 5, further comprising a three-leg magnetic core having the windings of said nonlinear reactors inductively disposed respectively on the outer legs thereof, and said first and second windings of said commutation transformer inductively disposed on the central leg thereof.
Claim 13
Dependent Claim
50 words
A power control system as claimed in claim 5, further comprising at least two toroidal magnetic cores which are axially superposed and have the windings of said nonlinear reactors inductively disposed respectively thereon, said first and second windings of said commutation transformer being inductively disposed on both said magnetic cores.
Claim 14
Dependent Claim
35 words
A power control system as claimed in claim 1, further comprising a three-leg magnetic core having the windings of said first and second reactors inductively disposed, respectively, on the outer legs of said magnetic core.
Claim 15
Dependent Claim
68 words
A power control system as claimed in claim 1, further comprising a pair of magnetic cores, wherein each of said nonlinear reactors includes a first winding inductively disposed on a different one of said magnetic cores and a second winding disposed on the opposed magnetic core and having flowing therethrough a load current passing through the other nonlinear reactor for resetting the magnetic fluxes in said nonlinear reactors.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |