IL48210A - Apparatus for transmitting information on electric power lines - Google Patents
Apparatus for transmitting information on electric power linesInfo
- Publication number
- IL48210A IL48210A IL48210A IL4821075A IL48210A IL 48210 A IL48210 A IL 48210A IL 48210 A IL48210 A IL 48210A IL 4821075 A IL4821075 A IL 4821075A IL 48210 A IL48210 A IL 48210A
- Authority
- IL
- Israel
- Prior art keywords
- power lines
- unipolar potential
- carrier frequency
- power
- transmitting over
- Prior art date
Links
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
- H04B2203/5416—Methods of transmitting or receiving signals via power distribution lines by adding signals to the wave form of the power source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5483—Systems for power line communications using coupling circuits
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Dc Digital Transmission (AREA)
- Rectifiers (AREA)
- Electronic Switches (AREA)
- Power Conversion In General (AREA)
Description
48210/2 Apparatus for" transmitting information on electric power lines General Public Utilities Corporation Background of the Invention The present invention relates in general to transmitting and more particularly concerns novel apparatus and techniques for transmitting over power lines. The invention is especially useful for transmitting digital data over power lines. The invention is characterized by reliability, relatively good efficiency and is relatively inexpensive and easy to fabricate while being operative over a relatively broad range of frequencies.
It is an important object of the invention to provide a transmitter for transmitting over power lines.
It is another object of the invention to achieve one or more of the preceding objects with a transmitter that receives its energizing potentials from a power line and uses ripple thus derived to help establish synchronism between the transmitted signal and the power line frequency.
It is another object of the invention to achieve one or more of the preceding objects with circuitry that is reliable and relatively efficient.
It is a further object of the invention to. achieve on or more of the preceding objects with a transmitter that may operate over a wide range of frequencies without tuning.
SUMMARY OF THE INVENTION According to the invention, there is a source of a unipolar potential derived from electrical power and having twice ripple at/ the power line frequency, means for interrupting the unipolar potential at a rate corresponding to a carrier frequency, and means for coupling the interrupted unipolar potential to the power lines to provide a carrier signal on the power lines.
Preferably the means for interrupting comprises transistor switching means coupled to the unipolar potential source and rendered alternatively conductive and non-conductive at a rate corresponding to the carrier frequency established by a modulating signal applied at a modulating input. The means for coupling the interrupted unipolar potential to the power lines typically comprises a triac.
Numerous other features, objects and advantages of the invention will become apparent from the following specif cation when read in connection with the accompanying drawing, the single figure of which is: ; BRIEF DESCRIPTION OF THE DRAWING A schematic circuit diagram of an exemplary embodiment of the invention.
Detailed P scri tion of Preferred Embodiments With reference now to the drawing, there is shown an M exemplary embodiment of a transponder transmitter. Transformer 50 which is a Stanco P-8605, steps down the 120V, 60~Ηζ power line voltage from electric service entrance 24 and 24'. The reduced - voltage is rectified by diodes 501 and 502, which are Motorola MR7 and filtered by capacitor 503. Transistors 504 and 505, which are 2H2222A, are normally turned off by the modulator signals on lines 136 and 136', via resistors 506 and 507, respectively. When input terminals 136 and 136' receive a modulating signal, transistors 504 and 505 are switched 180 degrees out of phase. When transisto I 504 is switched on, current flows through resistors 508 and 509, j charging capacitor 510, thereby slowly switching on transistor 511, I which is a 2N2905, whose collector current is limited bv re- ! ■" ' ! sistor 523, and transistor 512, which is a 2 6111 x>/hose emitter i ; current is limited by resistor 513. This raises the voltage on li i ! 525 to that on line 526, thereby charging capacitor 528 through ! I !I resistor 527. The voltac..e drop. across resistor 527 causes triac I j 529 to conduct. When the modulating signal on line 136 switches I off transistor 504, caoacitor 510 discharges through resistor 508, slowly switching off transistors 511 and 512, while diode 514, which is a Motorola MR751, clips the spike created b}' the ind •j tance of electric service entrance 24 and a distribution trans-j former. When transistor 505 is switched on by the modulating signal ' on line 136', transistor 515, which is a 2U2905, is switched on via I IiIi r'es'istors 516 and 517. Current then flows throug-h resistor 518, I charging capacitor 519, thereby slowly turning on transistor 520, A GEN P04 which is a 2N6386, whose emitter current is limited by resistor CH:mj 2/6/75 524 . This lowers the voltage on line 525 to that on line 24', th service entrance neutral, thereby discharging capacitor 528 throul resistor 527. The voltage drop across resistor 527 causes triac 529 to conduct. When the modulating signal on line 136' switches off transistor 505, capacitor 519 discharges through resistor 521, slowly switching off transistor 520, while diode 522, which is a Motorola MR751, clips the spike created by the inductance of electric service entrance 24 and the distribution transformer. Th 10 voltage transitions on . inc 525 are coupled to the electric service entrance, lines 24 and 24' , by coupling capacitor 109.
The circuitry just described comprises a source of unipolar potential on line526 derived from the electrical power an having ripple at the power line frequency. The transistor circuitry comprises means for interrupting the unipolar potential at a rate corresponding to the carrier frequency in response to the means for modulating applied to the bases of transistors 504 and 505 to interrupt the unipolar potential at a rate corresponding to the carrier frequency. The triac 529 comprises means for coupling 20 the interrupted unipolar potential to the power lines to provide a carrier signal on the power lines.
There has been described novel apparatus and techniques for effectively communicating over power lines with numerous advantages and features described above. It is apparent that those skilled in the art may now make numerous uses and modifications of and departures from the specific embodiments described herein with out departing from the inventive concepts. Consequently , the in- 7 vention is to be construed as embracing each and every novel feature and novel combination of features present in or possessed 30 the apparatus and techniques herein disclosed and limited solely by the spirit and scope of the appended claims.
Claims (4)
1. GEN P04 CLAIMS 1:mi /6/75 1. Apparatus for transmitting over power lines comprising, · ' ' . '· a source of a unipolar potential derived from electrical! power on said power lines and having ripple at the ■'power' line frequency of said electrical power, an input terminal pair for receiving a modulating signal of carrier frequency for interrupting said unipolar potential at a rate corresponding to said carrier frequency, . 10 and means for coupling the interrupted unipolar potential to said power lines to provide a carrier signal of said carrier frequency on said power lines.
2. Apparatus for transmitting over power lines in . accordance with claim 1 wherein said means for interrupting comprises transistor switching means coupled to said unipolar potential source rendered alternately conductive and noncon uctivel at a rate corresponding to the carrier frequency by said modulating signal.
3. Apparatus for transmitting over power lines in 20 accordance with claim 2 wherein said means for coupling the interrupted unipolar potential to said power lines comprises a triac.
4. Apparatus for transmitting over power lines, substantially as hereinbefore described with reference to the accompanying drawings. For the Applicants Dr.Yitzhak He88
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US55135675A | 1975-02-20 | 1975-02-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IL48210A0 IL48210A0 (en) | 1975-11-25 |
| IL48210A true IL48210A (en) | 1977-12-30 |
Family
ID=24200933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL48210A IL48210A (en) | 1975-02-20 | 1975-09-30 | Apparatus for transmitting information on electric power lines |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS51101411A (en) |
| AR (1) | AR204804A1 (en) |
| BE (1) | BE836830A (en) |
| BR (1) | BR7601036A (en) |
| CA (1) | CA1052280A (en) |
| CH (1) | CH600709A5 (en) |
| DE (1) | DE2545344B2 (en) |
| ES (1) | ES441952A1 (en) |
| FR (1) | FR2301979A1 (en) |
| GB (1) | GB1528369A (en) |
| IL (1) | IL48210A (en) |
| IN (1) | IN143965B (en) |
| IT (1) | IT1052793B (en) |
| NL (1) | NL7601689A (en) |
| SE (1) | SE403421B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB662655A (en) * | 1949-02-04 | 1951-12-12 | Nl Standard Electric Maatsscha | Improvements in or relating to signalling systems employing d.c. impulses over and a.c. supply line |
| US3652876A (en) * | 1970-04-30 | 1972-03-28 | Quasar Microsystems Inc | Data transmission system, utilizing ac line frequency as clock |
| CH540607A (en) * | 1971-07-01 | 1973-08-15 | Zellweger Uster Ag | Method and device for signal generation and application of the method |
| JPS5326653B2 (en) * | 1973-06-14 | 1978-08-03 |
-
1975
- 1975-01-01 AR AR261387A patent/AR204804A1/en active
- 1975-09-30 IL IL48210A patent/IL48210A/en unknown
- 1975-10-09 DE DE19752545344 patent/DE2545344B2/en not_active Withdrawn
- 1975-10-21 ES ES441952A patent/ES441952A1/en not_active Expired
- 1975-11-06 CA CA239,097A patent/CA1052280A/en not_active Expired
- 1975-11-11 IN IN2153/CAL/75A patent/IN143965B/en unknown
- 1975-11-11 SE SE7512634A patent/SE403421B/en unknown
- 1975-12-10 IT IT52617/75A patent/IT1052793B/en active
- 1975-12-12 GB GB51056/75A patent/GB1528369A/en not_active Expired
- 1975-12-16 FR FR7538550A patent/FR2301979A1/en active Granted
- 1975-12-18 BE BE162904A patent/BE836830A/en unknown
- 1975-12-22 CH CH1662775A patent/CH600709A5/xx not_active IP Right Cessation
-
1976
- 1976-01-26 JP JP51007413A patent/JPS51101411A/en active Pending
- 1976-02-19 NL NL7601689A patent/NL7601689A/en not_active Application Discontinuation
- 1976-02-19 BR BR7601036A patent/BR7601036A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IL48210A0 (en) | 1975-11-25 |
| JPS51101411A (en) | 1976-09-07 |
| BE836830A (en) | 1976-06-18 |
| IT1052793B (en) | 1981-07-20 |
| AR204804A1 (en) | 1976-02-27 |
| CA1052280A (en) | 1979-04-10 |
| GB1528369A (en) | 1978-10-11 |
| DE2545344B2 (en) | 1977-03-24 |
| FR2301979B1 (en) | 1978-05-12 |
| ES441952A1 (en) | 1977-03-16 |
| NL7601689A (en) | 1976-08-24 |
| DE2545344A1 (en) | 1976-08-26 |
| FR2301979A1 (en) | 1976-09-17 |
| BR7601036A (en) | 1976-09-14 |
| AU8528575A (en) | 1977-04-07 |
| IN143965B (en) | 1978-03-04 |
| CH600709A5 (en) | 1978-06-30 |
| SE7512634L (en) | 1976-08-23 |
| SE403421B (en) | 1978-08-14 |
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