Patent US4642637A successfully refreshed from Google Patents.
US4642637A
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Method for transmitting data via a line of an alternating current distribution network, and a transmitter for carrying out the method
Assignee: Zellweger Uster AG
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Filing: 1985-08-20
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Granted: 1987-02-10
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Expires: 2005-08-20
Abstract
Abstract The transmitter generates a current signal typical of the data to be transmitted, as a load current of a specific load resistance. To transmit this current signal, the load resistance is connected for a short time to a voltage source, with the result that a series of current pulses (I) is produced. The times of generation and/or the duration of these current pulses are chosen so that the resulting transmitted signal corresponds at least approximately to a desired theoretical signal (R). The method is very flexible with regard to the frequency of the current signal, and the transmitter requires neither amplifiers nor tuned resonant circuits which play a role in determining the transmission frequency. The method is particularly suitable for transmission, to a central unit, of data concerning, for example, the counter reading from counters distributed over the network or concerning the executed command from ripple control receivers.
Inventors
- 👤 Hanspeter Baer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:53
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: 29
Claim 1
Independent Claim
126 words
A method for transmitting data via a line of an alternating current distribution network, in which a current signal carrying the data to be transmitted is generated and input into the network, comprising the steps of generating a current signal as a load signal by periodically connecting a load to a voltage source of the distribution network via a switch repeatedly for short time intervals in order to transmit on the line of the distribution network a series of current pulses whose times of generation and/or duration are such that the resulting transmitted current signal corresponds at least approximately to a desired theoretical signal of predetermined frequency, and modulating said transmitted current signal with data to produce said current signal carrying the data to be transmitted.
Claim 2
Independent Claim
126 words
A method for transmitting data via a line of an alternating current distribution network, in which a current signal carrying the data to be transmitted is generated and input into the network, comprising the steps of generating a current signal as a load signal by periodically connecting a load to a voltage source of the distribution network via a switch repeatedly for short time intervals in order to transmit on the line of the distribution network a series of current pulses whose times of generation and/or duration are such that the resulting transmitted current signal corresponds at least approximately to a desired theoretical signal of predetermined frequency, and modulating said transmitted current signal with data to produce said current signal carrying the data to be transmitted.
Claim 3
Dependent Claim
19 words
A method according to claim 1, wherein the switch is actuated several times per period to the supply voltage.
Claim 4
Dependent Claim
15 words
A method according to claim 2, wherein the generated current pulses are of constant duration.
Claim 5
Dependent Claim
31 words
A method according to claim 3, wherein the duration of the current pulses is such that a large number of current pulses can be generated per period of the supply voltage.
Claim 6
Dependent Claim
30 words
A method according to claim 4, wherein the duration of the current pulses is such that more than fifty current pulses can be generated per period of the supply voltage.
Claim 7
Dependent Claim
30 words
A method according to claim 4, wherein the desired theoretical signal is derived from a carrier-frequency signal, the period of which is smaller than the period of the supply voltage.
Claim 8
Dependent Claim
32 words
A method according to claim 6, wherein, at a supply voltage with a frequency of 50 Hz, said desired theoretical signal is provided at a frequency of about 100 to 2500 Hz.
Claim 9
Dependent Claim
50 words
A method according to claim 6, wherein said desired theoretical signal is obtained as a result of a signal portion being superimposed on the carrier-frequency signal and having the frequency of the supply voltage, wherein the carrier frequency signal has a frequency equal to that of the desired theoretical signal.
Claim 10
Dependent Claim
67 words
A method according to claim 1, wherein a control signal is generated to control the switch based on the theoretical assumption that the voltage source is constituted by a direct current voltage, and said control signal is generated such that the signal formed by arranging the current pulses side by side has as large a spectral part as possible at the frequency of the desired theoretical signal.
Claim 11
Dependent Claim
32 words
A method according to claim 9, wherein the value of the theoretically assumed direct current voltage is chosen to be equal to the amplitude of the alternating current voltage of the network.
Claim 12
Dependent Claim
21 words
A method according to claim 10, wherein a plurality of current pulses are generated per period of the desired theoretical signal.
Claim 13
Dependent Claim
16 words
A method according to claim 10, wherein the desired theoretical signal has a direct current component.
Claim 14
Dependent Claim
20 words
A method according to claim 10, wherein about 64 current pulses are generated per period of the desired theoretical signal.
Claim 15
Dependent Claim
64 words
A method according to claim 9, wherein a supply a.c. voltage is used as the voltage source, and the signal composed of the current pulses is amplitude-modulated, with the result that, instead of the signal component at the frequency (f) of the desired theoretical signal, two components having the frequencies f+F and f-F are formed, (F) representing the frequency of the supply a.c. voltage.
Claim 16
Dependent Claim
131 words
A transmitter for transmitting data via a line of an alternating current distribution network, in which a current signal carrying the data to be transmitted is generated and input into the network, comprising a load device, switch means responsive to a control signal for periodically connecting said load device to the line of said alternating current distribution network to generate a current signal consisting of a series of current pulses whose times of generation and/or duration are such that the resulting transmitted current signal corresponds at least approximately to a desired theoretical signal of predetermined frequency, and processor means including a computer responsive to selected chracteristics of the supply voltage of said alternating current distribution network and said desired theoretical signal for generating said control signal for controlling said switch means.
Claim 17
Dependent Claim
131 words
A transmitter for transmitting data via a line of an alternating current distribution network, in which a current signal carrying the data to be transmitted is generated and input into the network, comprising a load device, switch means responsive to a control signal for periodically connecting said load device to the line of said alternating current distribution network to generate a current signal consisting of a series of current pulses whose times of generation and/or duration are such that the resulting transmitted current signal corresponds at least approximately to a desired theoretical signal of predetermined frequency, and processor means including a computer responsive to selected chracteristics of the supply voltage of said alternating current distribution network and said desired theoretical signal for generating said control signal for controlling said switch means.
Claim 18
Dependent Claim
20 words
A transmitter according to claim 15, wherein said selected characteristics of said supply voltage include amplitude values and phase values.
Claim 19
Dependent Claim
50 words
A transmitter according to claim 16, wherein the desired theoretical signal is obtained as a result of a signal portion being superimposed on a carrier-frequency signal and having the frequency of the supply voltage, wherein the carrier frequency signal has a frequency equal to that of the desired theoretical signal.
Claim 20
Dependent Claim
44 words
A transmitter according to claim 17, wherein said processor means includes a memory connected to receive the output of said computer in the form of addresses of the memory pre-computed in accordance with possible phase values of the supply voltage and the carrier-frequency signal.
Claim 21
Dependent Claim
22 words
A transmitter according to claim 18, wherein said processor means includes binary counters for calculating the actual phase value of the signals.
Claim 22
Dependent Claim
52 words
A transmitter according to claim 19, wherein said processor means includes an interface circuit connected to receive the information regarding the current pulses to be generated from the output of said memory for the particular applied address and supplying an output in the form of said control signal to said switch means.
Claim 23
Dependent Claim
14 words
A transmitter according to claim 20, wherein said interface circuit comprises a shift register.
Claim 24
Dependent Claim
16 words
A transmitter according to claim 20, wherein said interface circuit is a component of the computer.
Claim 25
Dependent Claim
13 words
A transmitter according to claim 15, said load device comprises a resistance element.
Claim 26
Dependent Claim
23 words
A transmitter according to claim 15, wherein said selected characteristics include amplitude values of the supply voltage and of the desired theoretical signal.
Claim 27
Dependent Claim
25 words
A transmitter according to claim 24, wherein said selected characteristics additionally include the amplitude value of a direct current component of the desired theoretical signal.
Claim 28
Dependent Claim
59 words
A transmitter according to claim 25, wherein said processor means includes a memory connected to receive the output of the computer in the form of addresses of the memory determined in accordance with the times of transmission of the current pulses, which times are precomputed for a period of the desired theoretical signal as a function of its phase.
Claim 29
Dependent Claim
29 words
A transmitter according to claim 26, said computer operates to calculate the actual phase value of the desired theoretical signal and to determine the address formed by this value.
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) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |