Patent US3723849A successfully refreshed from Google Patents.
US3723849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for charging a storage capacitor
Assignee: Multiblitz Mannesmann GmbH
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Filing: 1972-05-04
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Granted: 1973-03-27
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Expires: 1992-05-04
Abstract
Abstract A first pair of antiparallel connected thyristors are connected in series with the a.c. input and the primary of a transformer. These thyristors are ignited respectively at the start of each half cycle. A rectifier is connected across the transformer secondary and across the storage capacitor to be charged. An auxiliary capacitor in series with a resistor are connected across the a.c. input. A second pair of antiparallel thyristors have an ignition device. The latter ignition device is controlled by a voltage derived from a voltage divider across the storage capacitor and ignite the second pair of thyristors some time after the start of successive half cycles. When ignited the respective second thyristor applies the voltage of the auxiliary capacitor across the first pair of thyristors in opposition to the a.c. voltage thereacross to turn off the ignited thyristor of the first pair.
Inventors
- 👤 W Ludloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:40
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/32; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/45; G05F1/455; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/253
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
In an apparatus for charging a storage capacitor from alternating current provided at a.c. input connections, comprising a rectifier, first means connecting said connections to said rectifier, and second means connecting said rectifier to said capacitor, the improvement comprising: said first means including a first pair of antiparallel connected thyristors in series between said connections, a first ignition device connected to said thyristors to ignite them respectively at about the start of each half cycle of the alternating current, an auxiliary capacitor and a resistor connected in series between said connections so that the auxiliary capacitor is charged by the a.c. voltage during each half cycle, a second pair of antiparallel connected thyristors, a second ignition device connected to said second pair of thyristors to ignite them respectively, and means connecting said capacitor and said second pair of thyristors across the first pair of thyristors in opposition to the a.c. voltage across the first pair of thyristors so upon ignition of one of the second pair of thyristors the capacitor is applied across the first pair of thyristors to shut off the same.
Claim 2
Dependent Claim
183 words
In an apparatus for charging a storage capacitor from alternating current provided at a.c. input connections, comprising a rectifier, first means connecting said connections to said rectifier, and second means connecting said rectifier to said capacitor, the improvement comprising: said first means including a first pair of antiparallel connected thyristors in series between said connections, a first ignition device connected to said thyristors to ignite them respectively at about the start of each half cycle of the alternating current, an auxiliary capacitor and a resistor connected in series between said connections so that the auxiliary capacitor is charged by the a.c. voltage during each half cycle, a second pair of antiparallel connected thyristors, a second ignition device connected to said second pair of thyristors to ignite them respectively, and means connecting said capacitor and said second pair of thyristors across the first pair of thyristors in opposition to the a.c. voltage across the first pair of thyristors so upon ignition of one of the second pair of thyristors the capacitor is applied across the first pair of thyristors to shut off the same.
Claim 3
Dependent Claim
38 words
In an apparatus as set forth in claim 1 including means connecting the storage capacitor to the second ignition device for controlling the operation of the second ignition device in response to the charge in the storage capacitor.
Claim 4
Dependent Claim
46 words
In an apparatus as set forth in claim 2, wherein said last mentioned means includes an adjustable voltage divider connected in parallel to the storage capacitor, said voltage divider having a voltage pick-off connection, and including threshold means connecting said pick-off connection and said second device.
Claim 5
Dependent Claim
17 words
In an apparatus as set forth in claim 3, wherein said threshold means is a glow lamp.
Claim 6
Dependent Claim
43 words
In an apparatus as set forth in claim 4, wherein said first means includes a transformer having a primary and a seconDary, said rectifier being a bridge rectifier connected across said secondary, said first pair of thyristors being in series with said primary.
Claim 7
Dependent Claim
43 words
In an apparatus as set forth in claim 1, wherein said first means includes a transformer having a primary and a secondary, said rectifier being a bridge rectifier connected across said secondary, said first pair of thyristors being in series with said primary.
Claim 8
Dependent Claim
43 words
In an apparatus as set forth in claim 2, wherein said first means includes a transformer having a primary and a secondary, said rectifier being a bridge rectifier connected across said secondary, said first pair of thyristors being in series with said primary.
Claim 9
Dependent Claim
43 words
In an apparatus as set forth in claim 3, wherein said first means includes a transformer having a primary and a secondary, said rectifier being a bridge rectifier connected across said secondary, said first pair of thyristors being in series with said primary.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |