US3684945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible converter
Assignee: ABB Norden Holding AB
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Filing: 1971-02-08
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Granted: 1972-08-15
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Expires: 1991-02-08
Abstract
Abstract A reversible converter for feeding a DC load such as a motor from an AC network has a current regulator which is supplied with a signal representing the actual value of the direct current and a desired value. The regulator is connected both to an emitter for delivering control pulses to the rectifier with a control angle which is dependent on the output voltage of the current regulator, and to a device for switching the polarity of the converter depending on the polarity of the desired current value, which causes a retarding of the converter towards inverter operation before shifting of the polarity of the converter, unblocking and advancing towards rectifier operation. A member which senses the voltage over the DC load is connected to the current regulator when the polarity of the inverter is shifted and delivers to it a signal corresponding to a control angle of the control pulses such that the sum of the inner direct voltage of the converter and the voltage over the DC load is slightly less than zero.
Inventors
- 👤 Bo Hermansson
- 👤 Curt Hansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:49
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/66; H02M7/68; H02M7/72; H02M7/75; H02M7/757; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/1555; H02M7/1557; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
237 words
In combination with an A.C. network and a D.C. load, a reversible converter arrangement comprising a rectifier and feeding the D.C. load from the A.C. network, a current regulator for said converter; means to supply to the input side of the current regulator a signal representing the difference between the actual value of the direct current of the converter and a desired DC value in the converter; said current regulator including means responsive to the input signal to produce a predetermined direct voltage in the rectifier output, and means for switching the polarity of the converter depending on the polarity of the desirEd value of the current; said means on the input side of the current regulator including means responsive to a shifting of the polarity of said desired D.C. value to retard the converter towards inverter operation before shifting of the polarity of the converter and consequent unblocking and advancing towards rectifier operation, the improvement in which the converter comprises voltage limiting means for said converter, said voltage limiting means including means operatively connected to said polarity shifting responsive means and responsive to a shifting of the polarity of said desired D.C. value, said voltage limiting means comprising a member to sense the voltage over said D.C. load, said voltage limiting means including means to limit the voltage of the converter to a value which is a little less than the voltage over said D.C. load.
Claim 2
Dependent Claim
237 words
In combination with an A.C. network and a D.C. load, a reversible converter arrangement comprising a rectifier and feeding the D.C. load from the A.C. network, a current regulator for said converter; means to supply to the input side of the current regulator a signal representing the difference between the actual value of the direct current of the converter and a desired DC value in the converter; said current regulator including means responsive to the input signal to produce a predetermined direct voltage in the rectifier output, and means for switching the polarity of the converter depending on the polarity of the desirEd value of the current; said means on the input side of the current regulator including means responsive to a shifting of the polarity of said desired D.C. value to retard the converter towards inverter operation before shifting of the polarity of the converter and consequent unblocking and advancing towards rectifier operation, the improvement in which the converter comprises voltage limiting means for said converter, said voltage limiting means including means operatively connected to said polarity shifting responsive means and responsive to a shifting of the polarity of said desired D.C. value, said voltage limiting means comprising a member to sense the voltage over said D.C. load, said voltage limiting means including means to limit the voltage of the converter to a value which is a little less than the voltage over said D.C. load.
Claim 3
Dependent Claim
25 words
Combination according to claim 1, in which said amount is less than, but substantially equal to, the amplitude of the D.C. ripple of the converter.
Claim 4
Dependent Claim
50 words
Combination according to claim 1, wherein said converter arrangement comprises two reverse-parallel-connected converters, a common control pulse device, separate members connecting the control pulse device to the rectifiers of the converters, and means responsive to the polarity of the desired value of the current to block said connecting members alternatively.
Claim 5
Dependent Claim
84 words
Combination according to claim 1, in which the converter arrangement comprises a blocking device connected to the input side of the current regulator and influenced by the real value and the desired value of the current, and including means responsive to an alteration in polarity of the desired value to cause first a retarding of the converter towards inverter operation, and, when the real value has fallen to a certain low value, blocking of the converter with consequent shifting of polarity and unblocking thereof.
Claim 6
Dependent Claim
32 words
Combination according to claim 4, wherein said converter arrangement comprises two reverse-parallel-connected converters, said blocking device, depending on the polarity of the desired value, blocking one or the other of said converters.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |