US3896348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for supplying a dc load from an ac source through a rectifier
Assignee: Siemens AG
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Filing: 1974-07-02
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Granted: 1975-07-22
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Expires: 1994-07-02
Abstract
Abstract An improvement A.C. a circuit for supplying a D.C. load from an A.C. source through an uncontrolled rectifier with a control element arranged between the output of the rectifier and D.C. load using a control unit synchronized with the A.D. source to keep the power factor at a predetermined value and the circuit including a capacitor associated with the DC control element and a by-pass diode bridged across the DC load in which, in order to suppress harmonics to the greatest degree possible, the DC load is bridged by two by-pass diodes connected in series in the same direction and the capacitor associated with the DC control element is connected between one input terminal and the center connection point of the two by-pass diodes. In a second variation, the same result is achieved with the capacitor and a first decoupling diode connected in series between the input terminals of the DC control element with one electrode of the capacitor connected with one input terminal of the DC control element and the other electrode of the capacitor through a second decoupling diode to an output terminal of the DC control element.
Inventors
- 👤 Peter Loderer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:45
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M1/12; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/125; H02M3/135; H02M3/137; Y; Y02; Y02B; Y02B70/00; Y02B70/10; Y02P; Y02P80/00; Y02P80/10; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
130 words
In a circuit for supplying a DC load from an AC source through an uncontrolled rectifier and a DC control element arranged between the output of the rectifier and the DC load, the control unit of the DC control element being synchronized with the AC source and arranged to keep the power factor at a predetermined value, a capacitor being associated with the DC control element for storing energy, and a by-pass diode bridged across the DC load, an improved arrangement for suppressing unwanted harmonics comprising: a. a first and second by-pass diodes connected in series in the same direction across the load; b. a capacitor associated with the DC control element coupled between one input terminal of the DC control element and the center of the two by-pass diodes.
Claim 2
Dependent Claim
130 words
In a circuit for supplying a DC load from an AC source through an uncontrolled rectifier and a DC control element arranged between the output of the rectifier and the DC load, the control unit of the DC control element being synchronized with the AC source and arranged to keep the power factor at a predetermined value, a capacitor being associated with the DC control element for storing energy, and a by-pass diode bridged across the DC load, an improved arrangement for suppressing unwanted harmonics comprising: a. a first and second by-pass diodes connected in series in the same direction across the load; b. a capacitor associated with the DC control element coupled between one input terminal of the DC control element and the center of the two by-pass diodes.
Claim 3
Dependent Claim
15 words
The circuit according to claim 1 wherein said uncontrolled rectifier is a single-phase rectifier bridge.
Claim 4
Dependent Claim
69 words
The circuit according to claim 1 and further including a current regulator for determining the pulse width of the current supplied to the load, said current regulator having as inputs a value proportional to the load current and a value corresponding to a predetermined desired value of current, the output of said current regulator being provided as an input to the control unit associated with said DC control element.
Claim 5
Dependent Claim
47 words
The circuit according to claim 1 and further including a power factor control having as inputs a voltage proportional to the actual power factor of the AC source and a reference value indicative of a desired power factor and having outputs provided to said DC control unit.
Claim 6
Dependent Claim
30 words
The circuit arrangement according to claim 1 and further including means for determining the zero crossing of the AC voltage source, said means providing an output to said control unit.
Claim 7
Dependent Claim
19 words
The circuit arrangement according to claim 1 wherein said DC load comprises an electric motor fed by an inverter.
Claim 8
Dependent Claim
146 words
In a circuit for supplying a DC load from an AC source through an uncontrolled rectifier and a DC control element arranged between the output of the rectifier and the DC load, the control unit of the DC control element being synchronized with the AC source and arranged to keep the power factor at a predetermined value, a capacitor being associated with the DC control element for storing energy, and a by-pass diode bridged across the DC load, an improved arrangement for suppressing unwanted harmonics comprising: the capacitor associated with the DC control element and a first decoupling diode connected in series between the input terminals of the DC control element, one electrode of the capacitor connected with one input terminal of DC control element and a second decoupling diode coupling the other electrode of the capacitor with an output terminal of said DC control element.
Claim 9
Dependent Claim
146 words
In a circuit for supplying a DC load from an AC source through an uncontrolled rectifier and a DC control element arranged between the output of the rectifier and the DC load, the control unit of the DC control element being synchronized with the AC source and arranged to keep the power factor at a predetermined value, a capacitor being associated with the DC control element for storing energy, and a by-pass diode bridged across the DC load, an improved arrangement for suppressing unwanted harmonics comprising: the capacitor associated with the DC control element and a first decoupling diode connected in series between the input terminals of the DC control element, one electrode of the capacitor connected with one input terminal of DC control element and a second decoupling diode coupling the other electrode of the capacitor with an output terminal of said DC control element.
Claim 10
Dependent Claim
15 words
The circuit according to claim 7 wherein said uncontrolled rectifier is a single-phase rectifier bridge.
Claim 11
Dependent Claim
69 words
The circuit according to claim 7 and further including a current regulator for determining the pulse width of the current supplied to the load, said current regulator having as inputs a value proportional to the load current and a value corresponding to a predetermined desired value of current, the output of said current regulator being provided as an input to the control unit associated with said DC control element.
Claim 12
Dependent Claim
47 words
The circuit according to claim 7 and further including a power factor control having as inputs a voltage proportional to the actual power factor of the AC source and a reference value indicative of a desired power factor and having outputs provided to said DC control unit.
Claim 13
Dependent Claim
30 words
The circuit arrangement according to claim 7 and further including means for determining the zero crossing of the AC voltage source, said means providing an output to said control unit.
Claim 14
Dependent Claim
19 words
The circuit arrangement according to claim 7 wherein said DC load comprises an electric motor fed by an inverter.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |