US3906337A
Expired / Lapsed
US
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Arrangement for feeding a DC load circuit from single phase or polyphase AC voltage mains with economizing of idle power consumption of load alternating current
Assignee: BBC Brown Boveri AG Germany
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Filing: 1974-03-13
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Granted: 1975-09-16
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Expires: 1994-03-13
Abstract
Abstract The arrangement includes a mains transformer having a primary winding and a secondary winding, with the secondary winding being connected to a load circuit including a full wave rectifier, smoothing devices, and at least one positively quenchable, or positive cut-off, controlled semi-conductor rectifier associated with a respective control device. The smoothing devices consist of at least one condenser, at least one choke and at least one filter tuned to double the frequency of the AC voltage mains. The magnitude of the alternating or direct current, available on the secondary side of the mains transformer in the form of current or voltage, is controlled by one or more positively quenchable controlled semi-conductor rectifiers, and the control device controls the controlled rectifier or rectifiers by pulse width modulation thereof to maintain the time slope of the power in the load circuit substantially in phase with the slope of the power, fluctuating with twice the mains frequency about the constantper-unit-of-time mean load power, of the load alternating current which is in phase with the mains AC voltage. In one embodiment, the current flowing from the AC voltage mains through a full wave rectifier into the DC load circuit is maintained constant and an AC voltage, of twice the mains frequency, is superposed on the DC voltage. In another embodiment, the DC voltage of the DC load is maintained constant and alternating current of twice the mains frequency is superposed on the direct current.
Inventors
- 👤 Manfred Depenbrock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:56
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/253; H02M1/00; H02M1/14; H02M1/15; H02M5/257; H02M5/2573; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
248 words
In an arrangement for feeding a DC load circuit from single phase or polyphase AC voltage mains, with economizing of idle, or reactive or wattless, power consumption of load alternating current, including a mains transformer having a primary winding connected to the AC voltage mains and a secondary winding connected to a load circuit in turn connected to a DC load, with said load circuit having connected therein a full wave rectifier, smoothing devices, and at least one positively quenchable controlled semi-conductor rectifier with a respective control device connected thereto: the improvement comprising, in combination, said smoothing devices including at least one condenser connected across said load circuit, at least one choke connected in series in said load circuit, and at least one filter connected in said load circuit between said rectifier and said DC load, said filter being tuned to double the frequency of said AC voltage mains; positively quenchable controlled semiconductor rectifier means controlling the magnitude of one current, of the alternating current and direct current, available on the secondary side of said mains transformer in the form of current or voltage; and a control device connected to and controlling said controlled rectifier means by pulse width modulation thereof, to maintain the time slope of the power in the load circuit substantially in phase with the slope of the power, fluctuating with twice the mains frequency about the constantper-uniT-of-time mean load power, of the load alternating current which is in phase with the mains AC voltage.
Claim 2
Dependent Claim
248 words
In an arrangement for feeding a DC load circuit from single phase or polyphase AC voltage mains, with economizing of idle, or reactive or wattless, power consumption of load alternating current, including a mains transformer having a primary winding connected to the AC voltage mains and a secondary winding connected to a load circuit in turn connected to a DC load, with said load circuit having connected therein a full wave rectifier, smoothing devices, and at least one positively quenchable controlled semi-conductor rectifier with a respective control device connected thereto: the improvement comprising, in combination, said smoothing devices including at least one condenser connected across said load circuit, at least one choke connected in series in said load circuit, and at least one filter connected in said load circuit between said rectifier and said DC load, said filter being tuned to double the frequency of said AC voltage mains; positively quenchable controlled semiconductor rectifier means controlling the magnitude of one current, of the alternating current and direct current, available on the secondary side of said mains transformer in the form of current or voltage; and a control device connected to and controlling said controlled rectifier means by pulse width modulation thereof, to maintain the time slope of the power in the load circuit substantially in phase with the slope of the power, fluctuating with twice the mains frequency about the constantper-uniT-of-time mean load power, of the load alternating current which is in phase with the mains AC voltage.
Claim 3
Dependent Claim
64 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 1, in which said semi-conductor controlled rectifier means comprises at least one controlled semi-conductor rectifier forming part of a controlled semi-conductor rectifier unit operable to initiate and cut-off the alternating or direct current, in the load circuit connected to the secondary winding of said mains transformer, at predetermined time intervals.
Claim 4
Dependent Claim
62 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 1, in which said controlled rectifier means comprises at least one controlled semi-conductor rectifier forming part of at least one semi-conductor controlled rectifier unit operable to short-circuit the AC or DC voltage, in the load circuit connected to the secondary side of said mains transformer, at predetermined intervals.
Claim 5
Dependent Claim
97 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 1, in which said semi-conductor controlled rectifier means comprises at least one controlled semi-conductor rectifier included in at least one controlled semi-conductor rectifier unit; said control device controlling each controlled rectifier unit in a manner such that voltage or current pulses of each half wave appearing on said full wave rectifier, and originating from the AC voltage mains, are substantially symmetrical to each other and such that all the controlled rectifier units are conductive at the times the AC oscillation passes through zero.
Claim 6
Dependent Claim
118 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 4, in which said control device comprises a two-point regulator having a blocking period operating mechanism connected in series therewith; said control device comparing at least one triangular auxiliary voltage with a mains-related nominal voltage formed from unipolar sinusoidal half waves, to provide ignition and quenching signals for said controlled semi-conductor rectifiers; said control device providing ignition and quenching signals for said controlled semi-conductor rectifiers when there is zero difference between the sinusoidal nominal voltage and the triangular auxiliary voltage; and a nominal value former operable to adjust pre-calculated values of the ratio between the mains frequency and the frequency of the auxiliary voltage.
Claim 7
Dependent Claim
103 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 5, including plural arrangements as claimed in claim 5, each including a respective controlled semi-conductor rectifier unit, combined to form a total arrangement; said mains transformer comprising plural part-transformers having respective secondary windings connected to each arrangement included in the total arrangement; said part-transformers being connected in series on their primary winding sides; the controlled rectifiers of the respective controlled rectifier units of each of said arrangements being ignited and quenched in phase-shifted relation with respect to the controlled rectifiers of the controlled rectifier units of each other arrangement.
Claim 8
Dependent Claim
38 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 5, in which said nominal value former maintains a ratio, between the mains frequency and the auxiliary voltage frequency, which is an integral number.
Claim 9
Dependent Claim
61 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 5, in which said control device is operable to vary the phase relation of the AC voltage on at least one controlled semi-conductor rectifier relative to the alternating current by uniform variation of the ignition times for all the controlled semi-conductor rectifiers relative to the mains voltage.
Claim 10
Dependent Claim
105 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 5, in which said control device is operable to vary the ratio of the value of the DC voltage to the amplItude of the AC voltage in a manner such that the angular difference between successive control signals, effecting quenching or ignition of controlled semi-conductor rectifiers of a controlled semi-conductor rectifier unit, is varied so that the mean value of the phase angles of both, relative to the mains voltage, does not change so that one ignition signal is advanced by the same amount as the other ignition signal is delayed.
Claim 11
Dependent Claim
85 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 5, in which said control device selects the angular distances between the ignition and quenching signals for the controlled semi-conductor rectifiers, during the course of a quarter cycle of an AC oscillation, such that the ratio of the DC voltage to the amplitude of the fundamental AC voltage oscillation in the load circuit assumes a predetermined value at which the harmonic content of the load alternating voltage simultaneously attains a minimum.
Claim 12
Dependent Claim
85 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 10, in which said control device effects such selection in a manner such that the ratio of the load DC voltage to the amplitude of the fundamental AC oscillation in the load circuit assumes a predetermined value such that a number of harmonics, having the lowest odd ordinal number, are reduced to zero, the number of such harmonics being equal to the number of ignition signals per quarter cycle less 1.
Claim 13
Dependent Claim
47 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 10, in which said control device effects such selection in a manner such that the peak values of the harmonic currents superposed on the fundamental oscillation of the mains current are all equal.
Claim 14
Dependent Claim
63 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 10, in which said control device selects the angular distances between the ignition and quenching signals such that the zero passage of the fundamental oscillation of the AC voltage, in the load circuit, has an optimum duration during an interval in which all controlled semi-conductor rectifier units are ignited.
Claim 15
Dependent Claim
103 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 6, in which each controlled semi-conductor rectifier unit consists of two identical thyristors connected in parallel with each other with relatively opposite polarities; a respective full wave rectifier for each arrangement included in the total arrangement; each full wave rectifier having its AC side connected to a respective secondary winding of said mains transformer; each arrangement of the total arrangement including a respective smoothing choke; the arrangements forming the total arrangements being connected in parallel on the DC load circuit side and in series on the alternating current side.
Claim 16
Dependent Claim
34 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 14, in which all the smoothing chokes are connected in series with the series-connected primary windings of said part transformers.
Claim 17
Dependent Claim
43 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 14, in which each choke is associated with its respective arrangement in the secondary circuit, and is connected in series with the associated secondary winding of the part transformer.
Claim 18
Dependent Claim
67 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 6, in which said total arrangement includes two identical arrangements; said mains transformer including a common magnetic frame having two arms on which the two part-transformers are arranged; and an equalizing yoke, for the differential magnetic flux of the two part transformers, being positioned between said two arms of said common magnetic frame.
Claim 19
Dependent Claim
65 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 6, in which four said arrangements are combined to form one total arrangement each including a respective secondary winding of said mains transformer; said arrangements constituting said total arrangement being connected in parallel on the DC side and said mains transformer including respective primary windings connected in series with each other.
Claim 20
Dependent Claim
60 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 5, in which said control device effects ignition and quenching of the controlled semi-conductor rectifiers of the respective controlled semi-conductor rectifier units in an order such that the current loads of all current carrying controlled rectifiers, during a half cycle, are about equal on the average.
Claim 21
Dependent Claim
60 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 5, in which said control device effects ignition and quenching of the controlled semi-conductor rectifiers of the individual controlled semi-conductor rectifier units in an order such that the difference between the time integrals of the voltage of the magnetically independent mains transformer remains at a minimum.
Claim 22
Dependent Claim
73 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 18, in which said control device provides a number of triangular auxiliary voltages corresponding to the number of controlled semi-conductor rectifier units each consisting of two thyristors connected in parallel with each other and with polarities reversed with respect to each other and a respective full wave rectifier; said triangular auxiliary voltages being phase-shifted uniformly relative to each other.
Claim 23
Dependent Claim
41 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 21, in which the ratio between the auxiliary voltage frequency and the mains frequency, multiplied by the number of provided triangular auxiliary voltages, is an integral number.
Claim 24
Dependent Claim
45 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 21, in which said control device is operable to vary the frequency of at least one triangular auxiliary voltage within the course of a half cycle of the sinusoidal nominal voltage.
Claim 25
Dependent Claim
48 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 1, in which said filter is connected in parallel with the DC load and is designed as an LC-series oscillatory circuit; said controlled semi-conductor rectifier unit being connected in parallel with the DC load.
Claim 26
Dependent Claim
39 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 1, in which said controlled semi-conductor rectifier unit is connected in series with the DC load; said filter being designed as an LC-parallel oscillatory circuit.
Claim 27
Dependent Claim
32 words
In an arrangement for feeding a DC load circuit, the improvement claimed in claim 1, in which the controlled semi-conductor rectifier units and the full wave rectifiers include common controlled semi-conductor rectifiers.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |