Patent US3721830A successfully refreshed from Google Patents.
US3721830A
Expired / Lapsed
US
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Pulse dip carrier system using ac distribution line
Assignee: Osaki Electric Co Ltd
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Filing: 1971-06-18
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Granted: 1973-03-20
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Expires: 1991-06-18
Abstract
Abstract A pulse dip carrier system comprises a series circuit having an electronic switch and a capacitor and being connected in parallel to an AC distribution line, and a phase shifter circuit for controlling the electronic switch by the phase shifter output. The electronic switch closes under the control of the phase shifter circuit when the phase of the line voltage of AC distribution line to a point of the zero instantaneous value thereof comes to a predetermined angle, a charging current flows in the capacitor when the electronic switch is closed whereby steep pulse dip is generated on the wave of the line voltage.
Inventors
- 👤 S Kawano
- 👤 S Kikuta
- 👤 H Oishi
- 👤 F Aoki
- 👤 M Shirakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:40
CPC Classifications
H; H02; H02J; H02J13/00; H02J13/13; H02J13/1311; H02J13/1315; H02J13/1313; Y; Y02; Y02B; Y02B90/00; Y02B90/20; Y02E; Y02E60/00; Y04; Y04S; Y04S10/00; Y04S10/50; Y04S10/52; Y04S40/00; Y04S40/12; Y04S40/121
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
152 words
A pulse dip carrier system using A.C. distribution lines, said system comprising a plurality of pulse dip generating circuits, each of said circuits including a series circuit consisting of an electronic switch and a capacitor, and a phase shifter circuit, said series circuit being connected in parallel with the A.C. distribution lines, said electronic switch being connected with said capacitor to control the charging current of said capacitor, said phase shifter circuit being connected with the A.C. distribution line to shift the phase of the line voltage of the A.C. distribution line and being connected with said electronic switch to close when the phase of the line voltage to the point of the zero instantaneous value thereof comes to a predetermined angle, a plurality of pulse dip generating points of said pulse dip generating circuits being determined at specific phase intervals over respective positive and negative half cycle of the line voltage.
Claim 2
Dependent Claim
152 words
A pulse dip carrier system using A.C. distribution lines, said system comprising a plurality of pulse dip generating circuits, each of said circuits including a series circuit consisting of an electronic switch and a capacitor, and a phase shifter circuit, said series circuit being connected in parallel with the A.C. distribution lines, said electronic switch being connected with said capacitor to control the charging current of said capacitor, said phase shifter circuit being connected with the A.C. distribution line to shift the phase of the line voltage of the A.C. distribution line and being connected with said electronic switch to close when the phase of the line voltage to the point of the zero instantaneous value thereof comes to a predetermined angle, a plurality of pulse dip generating points of said pulse dip generating circuits being determined at specific phase intervals over respective positive and negative half cycle of the line voltage.
Claim 3
Dependent Claim
20 words
A pulse dip carrier system in accordance with claim 1 wherein an inductance is connected in series with the capacitor.
Claim 4
Dependent Claim
17 words
A pulse dip carrier system in accordance with claim 1 wherein the electronic switch includes a thyristor.
Claim 5
Dependent Claim
66 words
A pulse dip carrier system in accordance with claim 3 wherein the switch includes a gate for the thyristor and the thyristor includes a cathode and wherein said phase shifter circuit comprises a series circuit including a resistor and a capacitor and is connected in parallel with the A.C. distribution line, and the latter said capacitor is connected across the gate and cathode of the thyristor.
Claim 6
Dependent Claim
39 words
A pulse dip carrier system in accordance with claim 3 comprising a charging current limiting resistor for limiting the charging current to the capacitor, the latter said resistor being inserted into the series circuit comprising the capacitor and thyristor.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |