US3670237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the smooth switching-on of an electrical load
Assignee: Rieter Ingolstadt GmbH
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Filing: 1970-12-16
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Granted: 1972-06-13
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Expires: 1990-12-16
Abstract
Abstract In apparatus for the smooth switching-on of an electrical load a supply line transformer feeds a rectifier having its output connected jointly with a synchronization stage and with a run-up or starting stage. Two such stages are connected to the outputs of the respective rectifiers, each of the stages including capacitor means, resistor means and selectors for varying the capacitor means and the resistor means, the capacitor means of the two stages being connected in series at a connection point for supplying a control voltage. A limiting value switch has its input connected with the limiting value switch and with an electrical load for controlling the voltage supplied to such electrical load.
Inventors
- 👤 Egon Hubel
- 👤 Gerhard Hoeber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:49
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/45; G05F1/455; H; H02; H02P; H02P1/00; H02P1/16; H02P1/26; H02P1/28
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
165 words
An apparatus for the smooth switching-on of an electrical load including a supply line or main transformer having two secondary windings and a rectifier in circuit with each of the secondary windings, the input of the two rectifiers being electrically separated from each other, comprising a synchronization stage and a run-up stage connected to the outputs of the respective rectifiers, each of said stages including capacitor means, resistor means and at least one adjusting means for varying at least one of said capacitor means and resistor means, said capacitor means of said two stages being connected in series at a connection point for supplying a control voltage, a limiting value switch having its input connected with said connection point, a smoothing capacitor connected between said limiting value switch and said run-up stage for providing a DC voltage, and a load switch having its input connected with said limiting value switch and connected with an electrical load for controlling the voltage supplied to such electrical load.
Claim 2
Independent Claim
165 words
An apparatus for the smooth switching-on of an electrical load including a supply line or main transformer having two secondary windings and a rectifier in circuit with each of the secondary windings, the input of the two rectifiers being electrically separated from each other, comprising a synchronization stage and a run-up stage connected to the outputs of the respective rectifiers, each of said stages including capacitor means, resistor means and at least one adjusting means for varying at least one of said capacitor means and resistor means, said capacitor means of said two stages being connected in series at a connection point for supplying a control voltage, a limiting value switch having its input connected with said connection point, a smoothing capacitor connected between said limiting value switch and said run-up stage for providing a DC voltage, and a load switch having its input connected with said limiting value switch and connected with an electrical load for controlling the voltage supplied to such electrical load.
Claim 3
Dependent Claim
44 words
The apparatus defined in claim 1, in which the load switch and the one connection of the supply line or main transformer are connected in a first phase, and the second connection of the transformer is connected in the phase leading such first Phase.
Claim 4
Dependent Claim
22 words
The apparatus defined in claim 2, in which the load switch is connected in the non-exchanged phase for providing a reversing drive.
Claim 5
Dependent Claim
25 words
The apparatus defined in claim 2, in which for each phase a load switch controlled by a synchronization stage and a run-up stage is provided.
Claim 6
Dependent Claim
19 words
The apparatus defined in claim 2, in which all connections are arranged between a main contactor and the load.
Claim 7
Dependent Claim
39 words
The apparatus defined in claim 4, and a further auxiliary contact for each load switch for reversing operation, actuated in accordance with reversing contactors to avoid phase exchange for the second connection of the supply line or main transformer.
Claim 8
Dependent Claim
17 words
The apparatus defined in claim 1, including a phase shifter for the supply line or main transformer.
Claim 9
Dependent Claim
23 words
The apparatus defined in claim 1, including a Zener diode arranged between the negative connection point of the rectifier and the synchronization stage.
Claim 10
Dependent Claim
39 words
The apparatus defined in claim 1, including a discharge diode connected in parallel with the adjusting means between the capacitor and the current supply device, and a discharge resistor of low ohmic resistance connected in parallel with the rectifier.
Claim 11
Dependent Claim
41 words
The apparatus defined in claim 1, including a discharge resistor for the capacitor in the starting stage, and a switch arranged between the smoothing capacitor on the one hand, and the adjusting means and said discharge resistor on the other hand.
Claim 12
Dependent Claim
35 words
The apparatus defined in claim 1, including a matching stage between the limiting value switch stage and the load switch, said matching stage having a transformer separating the matching stage electrically from said load switch.
Claim 13
Dependent Claim
14 words
The apparatus defined in claim 1, in which the load switch is a triac.
Claim 14
Dependent Claim
24 words
The apparatus defined in claim 1, including at least one transformer and a rectifying stage connected between the load switch and the electric load.
References Cited (Backward Citations)
US3307093A
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US3486101A
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US3584278A
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US3500174A
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US3548289A
Cited
US3573580A
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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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |