US3562626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for automatically controlling the voltage of an electrical filter
Assignee: Siemens AG
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Filing: 1969-05-02
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Granted: 1971-02-09
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Expires: 1989-05-02
Abstract
Abstract A filter is coupled to an AC voltage source via a control member which is controlled in operation by a control circuit. A switching component coupled to the control capacitor is connected to the control member via a counter which controls the conductivity condition of the switching component in a manner whereby the control capacitor is discharged only when the instantaneous magnitude of current flowing through the control member exceeds a response level within a specific interval between successive half waves of the AC source.
Inventors
- 👤 Hans-Jurgen Morell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:06
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66; B03C3/68; Y; Y10; Y10S; Y10S323/00; Y10S323/906
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
259 words
A circuit arrangement for automatically controlling the voltage of an electrical filter which is coupled to an AC voltage source via a control member, a transformer and a rectifier connected in series between said AC voltage source and said filter, said circuit arrangement comprising control means connected to said control member for controlling the operation of said control member, said control means comprising a control unit having an input connected to said AC voltage source, another input and an output connected to said control member for supplying to said control member a control magnitude corresponding to a control voltage applied to the other input of said control unit, a DC voltage source, a charging resistor, a cOntrol capacitor connected to said DC voltage source via said charging resistor and connected to the other input of said control unit for applying a control voltage to said control unit, discharge circuit means and circuit means and circuit means connecting said control capacitor to said discharge circuit means in parallel in accordance with the instantaneous magnitude of current flowing through said control member, said control capacitor discharging very considerably, said circuit means comprising switching means coupled to said control capacitor and coupling means including a counter connecting said switching means to said control member, said coupling means controlling the conductivity condition of said switching means in a manner whereby said control capacitor is discharged only when the instantaneous magnitude of current flowing through said control member exceeds a response level within a specific interval between successive half waves of said AC source.
Claim 2
Dependent Claim
259 words
A circuit arrangement for automatically controlling the voltage of an electrical filter which is coupled to an AC voltage source via a control member, a transformer and a rectifier connected in series between said AC voltage source and said filter, said circuit arrangement comprising control means connected to said control member for controlling the operation of said control member, said control means comprising a control unit having an input connected to said AC voltage source, another input and an output connected to said control member for supplying to said control member a control magnitude corresponding to a control voltage applied to the other input of said control unit, a DC voltage source, a charging resistor, a cOntrol capacitor connected to said DC voltage source via said charging resistor and connected to the other input of said control unit for applying a control voltage to said control unit, discharge circuit means and circuit means and circuit means connecting said control capacitor to said discharge circuit means in parallel in accordance with the instantaneous magnitude of current flowing through said control member, said control capacitor discharging very considerably, said circuit means comprising switching means coupled to said control capacitor and coupling means including a counter connecting said switching means to said control member, said coupling means controlling the conductivity condition of said switching means in a manner whereby said control capacitor is discharged only when the instantaneous magnitude of current flowing through said control member exceeds a response level within a specific interval between successive half waves of said AC source.
Claim 3
Dependent Claim
221 words
A circuit arrangement as claimed in claim 1, wherein the counter of said coupling means comprises an AND gate having inputs and an output, a first transistor having emitter, collector and base electrodes, said first transistor being biased in inverse direction, a first capacitor connected between the output of said AND gate and the base electrode of said first transistor, and wherein said circuit arrangement further comprises monostable flip-flop means having a second transistor having emitter, collector and base electrodes, an input of said AND gate being connected to the collector electrode of said second transistor, said second transistor having a conductivity condition which reverses said flip-flop means each time the instantaneous magnitude of current flowing through said control member exceeds the response level, a second input of said AND gate being connected to the collector electrode of said first transistor, a pair of resistors connected in series circuit arrangement with each other, said first transistor being connected in grounded emitter connection via said pair of resistors, a second capacitor connected between a common point in the connection of said pair of resistors and the collector electrode of said second transistor, a charging circuit for said second capacitor having a time constant which is such that the period of nonconductivity of said first transistor is slightly longer than said specific interval.
Claim 4
Dependent Claim
92 words
A circuit arrangement as claimed in claim 2, wherein said monostable flip-flop means has another transistor having emitter, collector and base electrodes and an emitter-collector path, and wherein said circuit arrangement further comprises another control capacitor connected in parallel with the emitter-collector path of said other transistor, a resistor and a diode connected in parallel with said other control capacitor, said other control capacitor being connected in parallel with said control capacitor via said resistor and said diode, said resistor and said diode blocking the charging current of said other control capacitor.
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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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |