US3602805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for automatic control of the voltage of an electrical filter
Assignee: Siemens AG
•
Filing: 1970-03-06
•
Granted: 1971-08-31
•
Expires: 1990-03-06
Abstract
Abstract A current transformer is connected between a source of voltage and a control circuit and supplies a signal when the current flowing through the filter exceeds a predetermined critical value. A control unit, which is coupled to the control circuit via a control system and which is connected to the current transformer, includes an auxiliary circuit connected in parallel with a charging circuit of a guide capacitor. The auxiliary circuit comprises a switching component having characteristics and a control circuit which are such that the guide capacitor charges more rapidly when the switching component is in its nonconductive condition than via the charging circuit. The switching condition of the switching component depends upon the switching position of a reversing switch and the signal from the current transformer. The switching component is in its nonconductive condition only during the time between the energization of the circuit arrangement via the reversing switch and the time during which the current transformer provides a signal for the first time after the energization of the circuit arrangement.
Inventors
- 👤 Levro Vukasovic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:36
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66; B03C3/68; H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/1555; Y; Y10; Y10S; Y10S323/00; Y10S323/903
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
348 words
A circuit arrangement for automatic control of the voltage of an electrical filter, said circuit arrangement comprising a control circuit coupled to an electrical filter for changing the voltage of said filter; a source of voltage coupled to said control circuit; a current transformer connected between said source of voltage and said control circuit and having an output for supplying a signal when the current flowing through said filter exceeds a predetermined critical value; a control system having an input coupled to said source of voltage, input means and an output connected to said control circuit for supplying to said control circuit a control magnitude, said control magnitude depending upon a control voltage supplied to the input means of said control system; a control unit having an input couple to said source of voltage and connected to the output of said current transformer and output means coupled to the input means of said control system, said control unit comprising a source of DC voltage, a guide capacitor, a charging circuit connecting said guide voltage supplied to said control system is produced by said control unit in accordance with the voltage of said guide capacitor, a discharging circuit connected in parallel with said guide capacitor, the current in said discharging circuit being controllable in accordance with the voltage of said filter and the current of said filter, auxiliary circuit means connected in parallel with said charging circuit, said auxiliary circuit means comprising a switching component having triggering characteristics and another control circuit which are such that said guide capacitor charges more rapidly when said switching component is in its nonconductive condition than via said charging circuit, a reversing switch, the switching condition of said switching component depending upon the switching position of said reversing switch and the signal from said current transformer, said switching component being in its nonconductive condition only during the time which elapses between the energization of said circuit arrangement via said reversing switch and the time during which said current transformer provides a signal for the first time after the energization of said circuit arrangement.
Claim 2
Dependent Claim
348 words
A circuit arrangement for automatic control of the voltage of an electrical filter, said circuit arrangement comprising a control circuit coupled to an electrical filter for changing the voltage of said filter; a source of voltage coupled to said control circuit; a current transformer connected between said source of voltage and said control circuit and having an output for supplying a signal when the current flowing through said filter exceeds a predetermined critical value; a control system having an input coupled to said source of voltage, input means and an output connected to said control circuit for supplying to said control circuit a control magnitude, said control magnitude depending upon a control voltage supplied to the input means of said control system; a control unit having an input couple to said source of voltage and connected to the output of said current transformer and output means coupled to the input means of said control system, said control unit comprising a source of DC voltage, a guide capacitor, a charging circuit connecting said guide voltage supplied to said control system is produced by said control unit in accordance with the voltage of said guide capacitor, a discharging circuit connected in parallel with said guide capacitor, the current in said discharging circuit being controllable in accordance with the voltage of said filter and the current of said filter, auxiliary circuit means connected in parallel with said charging circuit, said auxiliary circuit means comprising a switching component having triggering characteristics and another control circuit which are such that said guide capacitor charges more rapidly when said switching component is in its nonconductive condition than via said charging circuit, a reversing switch, the switching condition of said switching component depending upon the switching position of said reversing switch and the signal from said current transformer, said switching component being in its nonconductive condition only during the time which elapses between the energization of said circuit arrangement via said reversing switch and the time during which said current transformer provides a signal for the first time after the energization of said circuit arrangement.
Claim 3
Dependent Claim
92 words
A circuit arrangement as claimed in claim 1, wherein said control unit further comprises a thyristor connected in parallel with the control circuit of said switching component, circuit means including the switching path of said reversing switch connected in parallel with said thyristor, said switching path being blocked when said circuit arrangement is deenergized, said thyristor having a control path coupled to said current transformer in a manner whereby said thyristor is switched to its conductive condition at the first signal of said current transformer after the energization of said circuit arrangement.
Claim 4
Dependent Claim
30 words
A circuit arrangement as claimed in claim 1, wherein the charging circuit of said control unit includes a transistor and circuit means connecting said transistor as a constant current regulator.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |