US4056766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Commutation circuit for a cycloconverter with intermediate D.C. link
Assignee: Siemens AG
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Filing: 1976-02-26
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Granted: 1977-11-01
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Expires: 1996-02-26
Abstract
Abstract In a cycloconverter including an intermediate d-c link, a controlled rectifier and a inverter having main thyristors in a bridge circuit with bypass diodes in a bridge connected antiparallel thereto, a quenching circuit including a quenching thyristor and a commutating capacitor is connected parallel to each bridge arm, there being provided for each two bridge circuits having a common main lead a common commutating capacitor and at least one common damping capacitor, the latter connected parallel to a bridge arm to reduce the current dependence of the commutation voltage present at the commutating capacitor.
Inventors
- 👤 Hans-Hermann Zander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:35
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/45; H02M5/4505
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
In a cycloconverter having an intermediate d-c link, a controlled rectifier and an inverter with main thyristors in a bridge circuit, to which bypass diodes in a bridge circuit are connected with opposite polarity with a quenching circuit including a quenching thyristor and a commutating capacitor connected in parallel to each bridge arm, one commutating capacitor being provided for each two bridge arms which have a common main terminal lead, and commutating chokes arranged in the commutating circuits, the improvement comprising at least one damping capacitor coupled in parallel to a bridge arm for each two bridge arms with a common terminal lead.
Claim 2
Dependent Claim
103 words
In a cycloconverter having an intermediate d-c link, a controlled rectifier and an inverter with main thyristors in a bridge circuit, to which bypass diodes in a bridge circuit are connected with opposite polarity with a quenching circuit including a quenching thyristor and a commutating capacitor connected in parallel to each bridge arm, one commutating capacitor being provided for each two bridge arms which have a common main terminal lead, and commutating chokes arranged in the commutating circuits, the improvement comprising at least one damping capacitor coupled in parallel to a bridge arm for each two bridge arms with a common terminal lead.
Claim 3
Dependent Claim
18 words
Apparatus according to claim 1 wherein the capacity of all damping capacitors is at least approximately the same.
Claim 4
Dependent Claim
17 words
Apparatus according to claim 1 wherein a damping capacitor is coupled in parallel to each bridge arm.
Claim 5
Dependent Claim
18 words
Apparatus according to claim 3 wherein the capacity of all damping capacitors is at least approximately the same.
Claim 6
Dependent Claim
51 words
Apparatus according to claim 1 wherein said intermediate link includes an intermediate link capacitor made up of two capacitors in series across the link voltage and one damping capacitor is coupled between the common main terminal lead for each two bridge arms and the center tap of the intermediate link capacitors.
Claim 7
Dependent Claim
18 words
Apparatus according to claim 5 wherein the capacity of all damping capacitors is at least approximately the same.
Claim 8
Dependent Claim
26 words
Apparatus according to claim 1 and further including a switch connected between each respective main terminal lead for two bridge arms and the associated damping capacitors.
Claim 9
Dependent Claim
116 words
In a cycloconverter having an intermediate d-c link, a controlled rectifier and an inverter with main thyristors in a bridge circuit, to which bypass diodes in a bridge circuit are connected with opposite polarity with a quenching circuit including a quenching thyristor and a commutating capacitor connected in parallel to each bridge arm, one commutating capacitor being provided for each two bridge arms which have a common main terminal lead, and a commutating choke arranged in the commutating circuits, the improvement comprising at least one damping capacitor coupled in parallel to a bridge arm for each two bridge arms with a common terminal lead and an inductive base load coupled to the output of the cycloconverter.
Claim 10
Dependent Claim
116 words
In a cycloconverter having an intermediate d-c link, a controlled rectifier and an inverter with main thyristors in a bridge circuit, to which bypass diodes in a bridge circuit are connected with opposite polarity with a quenching circuit including a quenching thyristor and a commutating capacitor connected in parallel to each bridge arm, one commutating capacitor being provided for each two bridge arms which have a common main terminal lead, and a commutating choke arranged in the commutating circuits, the improvement comprising at least one damping capacitor coupled in parallel to a bridge arm for each two bridge arms with a common terminal lead and an inductive base load coupled to the output of the cycloconverter.
Claim 11
Dependent Claim
60 words
Apparatus according to claim 11, wherein said base load comprises a choke with two magnetically coupled windings coupled into each output line of the cycloconverter with one winding of each choke coupled to the inverter output, the junction point of the two windings of each coupled to the load and the other windings of all chokes coupled with each other.
Claim 12
Dependent Claim
18 words
Apparatus according to claim 9 wherein the capacity of all damping capacitors is at least approximately the same.
References Cited (Backward Citations)
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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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |