Patent US4371867A successfully refreshed from Google Patents.
US4371867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitting signals over alternating current power networks
Assignee: Siemens Building Technologies AG
•
Filing: 1980-10-01
•
Granted: 1983-02-01
•
Expires: 2000-10-01
Abstract
Abstract To transmit signals over an alternating current power distribution network, the network load parameters are modulated by means of non-linear elements or by varying the characteristics of components by electrical action dependent on a reference signal. A reference current, a capacitor voltage, a correction signal for varying an inductance of the network load, the network voltage, an external current source, the total current flowing through a divided network load or its zero passages and those of the network current form the reference signal. The network load is connected by a transformer to the network and comprises at least one series-resonant circuit.
Inventors
- 👤 Jean-Gabriel Gander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:11
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/54; H02; H02J; H02J13/00; H02J13/13; H02J13/1311; H02J13/1313; H04B2203/00; H04B2203/54; H04B2203/5404; H04B2203/542; Y; Y02; Y02E; Y02E60/00; Y04; Y04S; Y04S40/00; Y04S40/12; Y04S40/121
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
118 words
A method of producing intelligence signals for transmission over the lines of an alternating current power supply network in response to an input reference signal comprising: connecting a resonant circuit including a capacitive device to the lines of the power supply network; controlling the charging and discharging of said capacitive device from the power supply network; said charging and discharging of said capacitive device being controlled in response to intelligence to be transmitted to periodically charge said capacitive device so that said resonant circuit produces an intelligence signal for transmission over the power supply network; and wherein said control is effected in dependence on a comparison of the current flowing through said resonant circuit and the reference signal.
Claim 2
Independent Claim
118 words
A method of producing intelligence signals for transmission over the lines of an alternating current power supply network in response to an input reference signal comprising: connecting a resonant circuit including a capacitive device to the lines of the power supply network; controlling the charging and discharging of said capacitive device from the power supply network; said charging and discharging of said capacitive device being controlled in response to intelligence to be transmitted to periodically charge said capacitive device so that said resonant circuit produces an intelligence signal for transmission over the power supply network; and wherein said control is effected in dependence on a comparison of the current flowing through said resonant circuit and the reference signal.
Claim 3
Dependent Claim
21 words
A method according to claim 1 wherein said control is effected additionally in dependence on the voltage across said capacitive device.
Claim 4
Dependent Claim
58 words
A method according to claim 1 wherein a narrow or wide band signal is produced for transmission in dependence on the ratio: u=ωU.sub.N /LI.sub.o in which U N is the network voltage; ω=2π; f is the resonant frequency of said resonant circuit, L is the inductance of said resonant circuit; and I o is an adjustable reference current.
Claim 5
Dependent Claim
14 words
A method according to claim 3 wherein said control effects variation of said inductance.
Claim 6
Dependent Claim
42 words
A method according to claim 4 wherein said control is effected in dependence on a correction signal produced by comparison of the observed signal frequency on the line of the power supply network with the desired signal frequency of the reference signal.
Claim 7
Dependent Claim
34 words
A method according to claim 4 wherein said control for producing a wide band signal is effected additionally in dependence on the instantaneous magnitude of the network voltage on a specific network phase line.
Claim 8
Dependent Claim
23 words
A method according to claim 4 wherein said control is effected in dependence on the reference signal supplied by an external current source.
Claim 9
Dependent Claim
36 words
A method according to claim 1 wherein said resonant circuit is divided to provide two alternately operable resonant elements, and said control is effected in dependence on the total current flowing through said divided resonant circuit.
Claim 10
Dependent Claim
172 words
A transmitting device for producing intelligence signals over the lines of an alternating current power supply network comprising a resonant circuit connected to the power supply network, said resonant circuit including a capacitive device; switch means connected to control charging and discharging of said capacitive device; and control means connected to said switch means to periodically permit charging of said capacitive device from said power supply network so that said resonant circuit produces an intelligence signal on the power supply network; and wherein said control means includes a bistable circuit connected to control the state of said switch means in accordance with the state of said bistable circuit; a comparator circuit responsive to current through said resonant circuit and operative to place said bistable circuit in a reset state when current through said resonant circuit reaches a predetermined level; and a voltage detector responsive to the voltage across said capacitive device and operative to place said bistable circuit in a set state when a predetermined voltage across said capacitive device is detected.
Claim 11
Dependent Claim
172 words
A transmitting device for producing intelligence signals over the lines of an alternating current power supply network comprising a resonant circuit connected to the power supply network, said resonant circuit including a capacitive device; switch means connected to control charging and discharging of said capacitive device; and control means connected to said switch means to periodically permit charging of said capacitive device from said power supply network so that said resonant circuit produces an intelligence signal on the power supply network; and wherein said control means includes a bistable circuit connected to control the state of said switch means in accordance with the state of said bistable circuit; a comparator circuit responsive to current through said resonant circuit and operative to place said bistable circuit in a reset state when current through said resonant circuit reaches a predetermined level; and a voltage detector responsive to the voltage across said capacitive device and operative to place said bistable circuit in a set state when a predetermined voltage across said capacitive device is detected.
Claim 12
Dependent Claim
23 words
A transmitting device according to claim 9 wherein said resonant circuit includes an inductor with a coupled winding connected to said control means.
Claim 13
Dependent Claim
23 words
A transmitting device according to claim 9 wherein said resonant circuit comprises at least one series resonant circuit resonant at an audio frequency.
Claim 14
Dependent Claim
39 words
A transmitting device according to claim 9 wherein said resonant circuit comprises an inductor and said capacitive device connected in series between said lines of said network, and said switch means is a switch connected across said capacitive device.
Claim 15
Dependent Claim
15 words
A transmitting device according to claim 9 wherein said switch means comprises a semiconductor element.
Claim 16
Dependent Claim
15 words
A transmitting device according to claim 9 wherein said switch means comprises a trigger triode.
References Cited (Backward Citations)
DE1563943C
Cited
US3445814A
Cited
DE1563485A1
Cited
US3488517A
Cited
CH446962A
Cited
GB1142975A
Cited
US3509537A
Cited
DE2033914C3
Cited
DE2144996C3
Cited
US3721830A
Cited
CH540607A
Cited
US3835389A
Cited
US3818466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |