CA1082329A - Power supply fo power line carrier communication systems - Google Patents
Power supply fo power line carrier communication systemsInfo
- Publication number
- CA1082329A CA1082329A CA262,768A CA262768A CA1082329A CA 1082329 A CA1082329 A CA 1082329A CA 262768 A CA262768 A CA 262768A CA 1082329 A CA1082329 A CA 1082329A
- Authority
- CA
- Canada
- Prior art keywords
- primary
- power
- frequency
- oscillator
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/44—Arrangements for feeding power to a repeater along the transmission line
Abstract
POWER SUPPLY FOR POWER LINE
CARRIER COMMUNICATION SYSTEMS
ABSTRACT OF THE DISCLOSURE
Apparatus for powering a signal amplifier or repeater connected to the primary or high-voltage portion of a power distribution system. Oscillator and amplifier circuits are energized by power from the secondary or low-voltage portion of the power distribution system. The oscillator and ampli-fier circuits are connected to the primary winding of an air-core transformer. A capacitor is also connected to the primary winding to make the primary circuit of the air-core transformer resonant at the frequency of the oscillator. The secondary winding of the air-core transformer is connected to a reson-ating capacitor and to transformer and rectifier circuits which convert the AC voltage into DC voltage for powering the signal amplifier. Electrical isolation between the high-voltage and low-voltage portions of the distribution system is provided by the separation distance between the primary and secondary windings of the air-core transformer. Sufficient electrical energy is transferred between the primary and secondary windings of the air-core transformer by energizing the primary winding with a high-frequency voltage from the oscillator and amplifier circuits. The mutual inductance between the primary and secondary windings of the air-core transformer is low enough to permit reasonably efficient power transfer when the oscillator and amplifier circuits operate at high frequencies.
CARRIER COMMUNICATION SYSTEMS
ABSTRACT OF THE DISCLOSURE
Apparatus for powering a signal amplifier or repeater connected to the primary or high-voltage portion of a power distribution system. Oscillator and amplifier circuits are energized by power from the secondary or low-voltage portion of the power distribution system. The oscillator and ampli-fier circuits are connected to the primary winding of an air-core transformer. A capacitor is also connected to the primary winding to make the primary circuit of the air-core transformer resonant at the frequency of the oscillator. The secondary winding of the air-core transformer is connected to a reson-ating capacitor and to transformer and rectifier circuits which convert the AC voltage into DC voltage for powering the signal amplifier. Electrical isolation between the high-voltage and low-voltage portions of the distribution system is provided by the separation distance between the primary and secondary windings of the air-core transformer. Sufficient electrical energy is transferred between the primary and secondary windings of the air-core transformer by energizing the primary winding with a high-frequency voltage from the oscillator and amplifier circuits. The mutual inductance between the primary and secondary windings of the air-core transformer is low enough to permit reasonably efficient power transfer when the oscillator and amplifier circuits operate at high frequencies.
Description
BACKGROUND OF THE INVENTION
Field of the_Inve_tion:
This invention relates, in general3 to communication ..... , ..... ... .. .. . ., , . . . .. ... . ; . . ~ . . , ,. . . , . - . .
- .. . , . .... ~ , :
:.. . ~ , . . , . ~ , .:
10f~3Z~
systerns ror electr:ical power lines and, more speci~ically, to appara-tus I`or supplying power to communication ampli~iers or repeaters connec-ted to the primary portions of a power distribution system.
Description of the Prior Art-.
Communication signal ampli~iers or repeaters areused in power line carrier communication systems to compensate for attenuation of the communication signal along the power line. Such signal ampli~iers or repea-ters usually include electronic circuitry which requires electrical power for its operation. Although many arrangements have been proposed, one of the most practical methods lnvolves acquiring elec-trical energy ~rom the power line system to which it is asso-ciated.
When the slgnal amplifiers or repea-ters are connected to the secondary or low-voltage por-tion o~ -the power distri-bution lines, the electrical power ~or operating the ampli~ier can be obtained directly ~rom the secondary portion o~ -the distribution sys-tem. However, when the ampli~ier is associated with the high-voltage or primary portion O:r the distribution system, extreme oare must be used when delivering power to the ampli:rier ~rorn a secondary or low-voltage line. This is due mainly to the possibility that high-vol-tage surges on -the primary portion o~ the distribution line may be conducted to the secondary portion o~ the distribution line through the appara-tus which powers the signal amplifier. Consequently, such power arrangements must provide complete isolation between the primary and secondary power line systems under severe voltage surge conditions.
To eliminate the need ~or isolation between the
Field of the_Inve_tion:
This invention relates, in general3 to communication ..... , ..... ... .. .. . ., , . . . .. ... . ; . . ~ . . , ,. . . , . - . .
- .. . , . .... ~ , :
:.. . ~ , . . , . ~ , .:
10f~3Z~
systerns ror electr:ical power lines and, more speci~ically, to appara-tus I`or supplying power to communication ampli~iers or repeaters connec-ted to the primary portions of a power distribution system.
Description of the Prior Art-.
Communication signal ampli~iers or repeaters areused in power line carrier communication systems to compensate for attenuation of the communication signal along the power line. Such signal ampli~iers or repea-ters usually include electronic circuitry which requires electrical power for its operation. Although many arrangements have been proposed, one of the most practical methods lnvolves acquiring elec-trical energy ~rom the power line system to which it is asso-ciated.
When the slgnal amplifiers or repea-ters are connected to the secondary or low-voltage por-tion o~ -the power distri-bution lines, the electrical power ~or operating the ampli~ier can be obtained directly ~rom the secondary portion o~ -the distribution sys-tem. However, when the ampli~ier is associated with the high-voltage or primary portion O:r the distribution system, extreme oare must be used when delivering power to the ampli:rier ~rorn a secondary or low-voltage line. This is due mainly to the possibility that high-vol-tage surges on -the primary portion o~ the distribution line may be conducted to the secondary portion o~ the distribution line through the appara-tus which powers the signal amplifier. Consequently, such power arrangements must provide complete isolation between the primary and secondary power line systems under severe voltage surge conditions.
To eliminate the need ~or isolation between the
- 2 -... . . .
~01 3Z3Z~
apparatus which supplies power to the ampli~ier and the high potential on the d:Lstribu-tion line, some arrangements have used ~ppar~tus which divides or reduces the vo]-~age of the high-vo:Ltage distribut:lon llne to that suitable ~or powering the signal amplifier. One such arrangement uses a series network of capacitors connec-ted between the high-voltage line and ground potential. The capacitor arrangement acts as a capacitive voltage divider circui-t and provides a reduced voltage to the signal amplifier. Another arrangeme~t uses a step-down transformer which is connected between the high-voltage line and ground potential and is connected to -the signal amplifier. Although both arrangements have been used in practical applications, the requiremen-t that the components used -therein be suitable for use at extremely high potentials increases the cost of such apparatus.
Therefore, i-t is desirable, and it is an ob~ect of -this invention, to provide an arrangemen-t for powering a signal amplifier connected -to the primary portion of a power dis-tribution line, with such arrangement providing an economi- `
cal and reliable means for supplying power to the signal amplifier while still maintaining isola-tion between the primary and secondary conductors of the power distribution system. `~
SUMMARY OF THE INVENTION ;
There :ls dLsolosed here:Ln a new and use~u:L arrange-ment for powering a signal amplifier or repeater whic~ is connected to the high-voltage portion o~ a power distribution line. A low-voltage power supply is connected to the secondary portion of the power distribution line and supplies power to oscillator and amplifier circuits. The oscillator and ampli-fier circuits supply a relatively high frequency electrical
~01 3Z3Z~
apparatus which supplies power to the ampli~ier and the high potential on the d:Lstribu-tion line, some arrangements have used ~ppar~tus which divides or reduces the vo]-~age of the high-vo:Ltage distribut:lon llne to that suitable ~or powering the signal amplifier. One such arrangement uses a series network of capacitors connec-ted between the high-voltage line and ground potential. The capacitor arrangement acts as a capacitive voltage divider circui-t and provides a reduced voltage to the signal amplifier. Another arrangeme~t uses a step-down transformer which is connected between the high-voltage line and ground potential and is connected to -the signal amplifier. Although both arrangements have been used in practical applications, the requiremen-t that the components used -therein be suitable for use at extremely high potentials increases the cost of such apparatus.
Therefore, i-t is desirable, and it is an ob~ect of -this invention, to provide an arrangemen-t for powering a signal amplifier connected -to the primary portion of a power dis-tribution line, with such arrangement providing an economi- `
cal and reliable means for supplying power to the signal amplifier while still maintaining isola-tion between the primary and secondary conductors of the power distribution system. `~
SUMMARY OF THE INVENTION ;
There :ls dLsolosed here:Ln a new and use~u:L arrange-ment for powering a signal amplifier or repeater whic~ is connected to the high-voltage portion o~ a power distribution line. A low-voltage power supply is connected to the secondary portion of the power distribution line and supplies power to oscillator and amplifier circuits. The oscillator and ampli-fier circuits supply a relatively high frequency electrical
- 3 -. .
: : : : . : -.:
~)8Z3~
power slgna:l to a primary winding o~ an air-core trans~ormer.
The pr:imary ~nd secondary wlndlngs o:~ the air-core transformer are connected to capacitive elements whlch resonate the windings at the oscilla-tor frequency to improve -the efficiency of the coupling between the windings.
Due to -the relatively high frequency of the voltage produced by the oscilla-tor, the mutual inductance between the primary and secondary windings does not appreciably reduce the amoun-t of power transfer between the windings. Thus, an appreciable amount o~ high-frequency electrical power is availabl.e a-t the secondary winding of the ai.r-core transformer, The energy from the secondary winding of the air-core trans-former is applied to transformer and rectifier circuits which process -the voltage for providing the appropriate power to the amplifier or repeater apparatus. Due to the relatively wide spacing which can be main-tained between -the primary and secondary windings o:~ the air-core transformer, suitable isolation is provided between the primary and secondary por-tions of the power distribution system.
BRIEF DESCRIPTION OF TH _DR~WING
Fur-ther advantages and uses o~ thls invention will beoome more apparent when cons:ldered in vlew o:~ the :~ollowlng detalled descriptlon and draw:Lng, ln whLch:
Figure 1 is a diagram o~ a portion of a power dis--tribu-tion line communication system constructed according to the teachings of this invention; and Figure 2 is a diagram of the isolated power supply :
shown in Figure 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the following description, similar reference : . .
~0f~23~9 characters rerer to s-imilar elements or members in all of the ~`:igures o~ the draw:ing.
Re~erring now to the drawing, and to Figure 1 in particular, there is shown a diagram o~ a portion o~ a com-munication system associated with a power distribution system.
The power distribution sys-tem includes the primary or high-voltage conductors 10 and 12 which conduct electrical power at relatively high voltages. The distribution system also includes the secondary or low-voltage conductors 1~, 16 and 18 which supply power at relatively low voltages. The dis--tribution transformer 20 in-terconnects the high-voltage and low-voltage portions of the distribution system. The distrl-bution trans~ormer 20 includes the magnetic core 22, the primary winding 24 which is connected to the conductors 10 and 12, and the secondary wlnding 26 which is connected to the conductors 14, 16 and 18.
Carrier communication signals are usually coupled , . . . .. .
to one or more o~ the high-voltage conductors and propagate along these conductors until received by detecting appara-tus or attenuated by various devices. When the attenuatlon is severe, a suitable signal amplL~ier is help~ul ln providing reliable commun:lcatlons over the h:Lgh-voltage power dLstribu-tion system. Signal ampli~ier 28 represents such an amplifier.
It is also conceivable that a signal repeater may also be used to extend the range o~ power line carrier communication signals. A repeater generally translates or changes the ~requency o~ the inooming signal and provides a new outgoing signal at a di~erent ~requency.
In ~igure 1, assuming that the communication signal is propagated in the direction indicated by the arrow o~ 34, ~()82329 the communication signa:l. would enter -the signal amplifier 28 through the terrninal 30. The slgna:l would be ampli~ied and applied aga:in to the conductor :l2 at the terminal 32 for conduction on down the conductor 12 in the same direction.
It is also just as conceivable that -the comrnunicatlon signal could originally be propagated in the opposi-te direction, such as the direction indicated by the arrow 36. In some installations, the signal amplifier 28 would be capable of amplifying signals conducted along the conduc-tors in both directions, either simultaneously or separa-tely.
Since the signal amplifier 28 would normally contain electronic circuitry, some source of power is needed for the proper operation thereof. In the em'bodiment shown, powe:r is supplied by the conductors 35 and 37 which extend from the isolated power supply 38. The isolated power supply 38 receives its power at a relatively low voltage by connection to the conductors 14 and 16 at -the terminals ~0 and 42, respec- '' tively. The isolated power supply 38 transmits su~ficient .' power from the low-voltage portion of the distribution line to the signal amplifier 28 while maintaining su~ficient elec-trical isolation between the high-voltage portion of the dis- ' tribution system and the low-vo:Ltage portlon o~ the dist:r:Lbu-tlon system. ',~
Figure 2 is a diagram illustrating an arrangement of components ~or the isolated power supply 38 shown in Figure 1. The power supply ~4 may be of conventional design and supplies power for the oscillator and amplifier circuit 46. The oscillator and amplifier circuit 46 generates,a ,relatively high frequency signal which is of sufficient fre~
quency to provide adequate coupling be-tween the windings of " : ' . ' ' .:. . . ~'. ' . , lO~Z3~
the air-core transformer ~. Generally, -the frequency o~
the voltage rrom the oscillator ~6 would be at leas-t ten tlmes the ~requency o:~ the power signals existing on the conductors 1~ and 16, which is usually 50 or 60 her-tz. Experi-mental models have been found satisfactory which have an output voltage with a frequency above 15 kilohertz.
The primary winding 50 of the air-core transformer ~8 is connected to -the oscillator and amplifier ~6 through the capacitor 52. The purpose of a capacitor 52 is to resonate ;
the winding 50 at the frequency of the voltage from the oscil-lator and amplifier circui-t ~6. This provides the most effi-cient manner in which to couple power to -the primary winding of the air-core transformer 48, since the impedance represented by the series resonant circuit is substantlally a pure resistance of relatively low value. The secondary winding 5~ of alr-core transformer ~8 is connected in parallel clrcuit relationship with the capacitor 56 to provide a resonant circuit at the oscillator frequency for the same .
reasons. The difference between the series and parallel .
20 resonant clrcuits is necessitated by the inpu-t and ou-tpu-t ~`
impedances of the assoclated clrcults. It is wlthin the contemplation o~ this lnvent:Lon that a parallel resonant clrcu:Lt or a serles :resonant clrcult can be used on elther a primary or secondary winding. The determining factor would be the value o~ the impedance to which it is to be matched.
The voltage from the secondary winding 5~ is applied to the transformer and rectifier circuits 58 where it is .' transformed and rectified sufficiently to provide the desired value of voltage to the signal amplifier 28. Since the coupling between -the primary and secondary windings of the air-core i .~ ... ...
10~23Z9 trans~ormer ~ is subs-tantially '!tight" at the frequency o~ the oscillator and amp~ ier c:ircuit ~6, a suf~icient amount O:r energy may be trans~erred between the primary winding 50 and the secondary winding 5~ ~or powering the signal ampli-fier 28. However, due to -the physical spacing between these two windings, electrical isolation between the components at the low-voltage potential and at the high-voltage potential is maintained su~iciently. Experimental models tested using `
the teachings o~ this invention have indicated that a power trans~er of approximately 47 percent can be achieved when the primary and secondary windings are separated by approxi-mately 15 inches. However, other spacing values may be used within the contemplation of this invention, provided that they are sufficiently large enough to provide the electrical isolation desired. Physical spacing less than 5 inches would be considered too close to provide -the elec-trical isolation needed between -the high-voltage and low-voltage portions o~
the power distribution system.
The novel arrangement disclosed herein provides ~or a su~ficient amount o~ power trans~er -to operate a rela-tively low power consuming signal ampli:~ier and, at the same time, economical].y provide for isola-tion between the sLgnal amp:L:L~ier and the power provldlng clrcults. :Cn addltlon, since numerous changes may be made in -the above-described apparatus, and since di~erent embodiments o~ the invention may be made wlthout departing ~rom the spirit thereo~, it is intended that all o~ the matter con-tained in the ~oregoing description, or shown in the accompanying drawing, shall be interpreted as illus-trative rather than limiting.
, ,.
: : : : . : -.:
~)8Z3~
power slgna:l to a primary winding o~ an air-core trans~ormer.
The pr:imary ~nd secondary wlndlngs o:~ the air-core transformer are connected to capacitive elements whlch resonate the windings at the oscilla-tor frequency to improve -the efficiency of the coupling between the windings.
Due to -the relatively high frequency of the voltage produced by the oscilla-tor, the mutual inductance between the primary and secondary windings does not appreciably reduce the amoun-t of power transfer between the windings. Thus, an appreciable amount o~ high-frequency electrical power is availabl.e a-t the secondary winding of the ai.r-core transformer, The energy from the secondary winding of the air-core trans-former is applied to transformer and rectifier circuits which process -the voltage for providing the appropriate power to the amplifier or repeater apparatus. Due to the relatively wide spacing which can be main-tained between -the primary and secondary windings o:~ the air-core transformer, suitable isolation is provided between the primary and secondary por-tions of the power distribution system.
BRIEF DESCRIPTION OF TH _DR~WING
Fur-ther advantages and uses o~ thls invention will beoome more apparent when cons:ldered in vlew o:~ the :~ollowlng detalled descriptlon and draw:Lng, ln whLch:
Figure 1 is a diagram o~ a portion of a power dis--tribu-tion line communication system constructed according to the teachings of this invention; and Figure 2 is a diagram of the isolated power supply :
shown in Figure 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the following description, similar reference : . .
~0f~23~9 characters rerer to s-imilar elements or members in all of the ~`:igures o~ the draw:ing.
Re~erring now to the drawing, and to Figure 1 in particular, there is shown a diagram o~ a portion o~ a com-munication system associated with a power distribution system.
The power distribution sys-tem includes the primary or high-voltage conductors 10 and 12 which conduct electrical power at relatively high voltages. The distribution system also includes the secondary or low-voltage conductors 1~, 16 and 18 which supply power at relatively low voltages. The dis--tribution transformer 20 in-terconnects the high-voltage and low-voltage portions of the distribution system. The distrl-bution trans~ormer 20 includes the magnetic core 22, the primary winding 24 which is connected to the conductors 10 and 12, and the secondary wlnding 26 which is connected to the conductors 14, 16 and 18.
Carrier communication signals are usually coupled , . . . .. .
to one or more o~ the high-voltage conductors and propagate along these conductors until received by detecting appara-tus or attenuated by various devices. When the attenuatlon is severe, a suitable signal amplL~ier is help~ul ln providing reliable commun:lcatlons over the h:Lgh-voltage power dLstribu-tion system. Signal ampli~ier 28 represents such an amplifier.
It is also conceivable that a signal repeater may also be used to extend the range o~ power line carrier communication signals. A repeater generally translates or changes the ~requency o~ the inooming signal and provides a new outgoing signal at a di~erent ~requency.
In ~igure 1, assuming that the communication signal is propagated in the direction indicated by the arrow o~ 34, ~()82329 the communication signa:l. would enter -the signal amplifier 28 through the terrninal 30. The slgna:l would be ampli~ied and applied aga:in to the conductor :l2 at the terminal 32 for conduction on down the conductor 12 in the same direction.
It is also just as conceivable that -the comrnunicatlon signal could originally be propagated in the opposi-te direction, such as the direction indicated by the arrow 36. In some installations, the signal amplifier 28 would be capable of amplifying signals conducted along the conduc-tors in both directions, either simultaneously or separa-tely.
Since the signal amplifier 28 would normally contain electronic circuitry, some source of power is needed for the proper operation thereof. In the em'bodiment shown, powe:r is supplied by the conductors 35 and 37 which extend from the isolated power supply 38. The isolated power supply 38 receives its power at a relatively low voltage by connection to the conductors 14 and 16 at -the terminals ~0 and 42, respec- '' tively. The isolated power supply 38 transmits su~ficient .' power from the low-voltage portion of the distribution line to the signal amplifier 28 while maintaining su~ficient elec-trical isolation between the high-voltage portion of the dis- ' tribution system and the low-vo:Ltage portlon o~ the dist:r:Lbu-tlon system. ',~
Figure 2 is a diagram illustrating an arrangement of components ~or the isolated power supply 38 shown in Figure 1. The power supply ~4 may be of conventional design and supplies power for the oscillator and amplifier circuit 46. The oscillator and amplifier circuit 46 generates,a ,relatively high frequency signal which is of sufficient fre~
quency to provide adequate coupling be-tween the windings of " : ' . ' ' .:. . . ~'. ' . , lO~Z3~
the air-core transformer ~. Generally, -the frequency o~
the voltage rrom the oscillator ~6 would be at leas-t ten tlmes the ~requency o:~ the power signals existing on the conductors 1~ and 16, which is usually 50 or 60 her-tz. Experi-mental models have been found satisfactory which have an output voltage with a frequency above 15 kilohertz.
The primary winding 50 of the air-core transformer ~8 is connected to -the oscillator and amplifier ~6 through the capacitor 52. The purpose of a capacitor 52 is to resonate ;
the winding 50 at the frequency of the voltage from the oscil-lator and amplifier circui-t ~6. This provides the most effi-cient manner in which to couple power to -the primary winding of the air-core transformer 48, since the impedance represented by the series resonant circuit is substantlally a pure resistance of relatively low value. The secondary winding 5~ of alr-core transformer ~8 is connected in parallel clrcuit relationship with the capacitor 56 to provide a resonant circuit at the oscillator frequency for the same .
reasons. The difference between the series and parallel .
20 resonant clrcuits is necessitated by the inpu-t and ou-tpu-t ~`
impedances of the assoclated clrcults. It is wlthin the contemplation o~ this lnvent:Lon that a parallel resonant clrcu:Lt or a serles :resonant clrcult can be used on elther a primary or secondary winding. The determining factor would be the value o~ the impedance to which it is to be matched.
The voltage from the secondary winding 5~ is applied to the transformer and rectifier circuits 58 where it is .' transformed and rectified sufficiently to provide the desired value of voltage to the signal amplifier 28. Since the coupling between -the primary and secondary windings of the air-core i .~ ... ...
10~23Z9 trans~ormer ~ is subs-tantially '!tight" at the frequency o~ the oscillator and amp~ ier c:ircuit ~6, a suf~icient amount O:r energy may be trans~erred between the primary winding 50 and the secondary winding 5~ ~or powering the signal ampli-fier 28. However, due to -the physical spacing between these two windings, electrical isolation between the components at the low-voltage potential and at the high-voltage potential is maintained su~iciently. Experimental models tested using `
the teachings o~ this invention have indicated that a power trans~er of approximately 47 percent can be achieved when the primary and secondary windings are separated by approxi-mately 15 inches. However, other spacing values may be used within the contemplation of this invention, provided that they are sufficiently large enough to provide the electrical isolation desired. Physical spacing less than 5 inches would be considered too close to provide -the elec-trical isolation needed between -the high-voltage and low-voltage portions o~
the power distribution system.
The novel arrangement disclosed herein provides ~or a su~ficient amount o~ power trans~er -to operate a rela-tively low power consuming signal ampli:~ier and, at the same time, economical].y provide for isola-tion between the sLgnal amp:L:L~ier and the power provldlng clrcults. :Cn addltlon, since numerous changes may be made in -the above-described apparatus, and since di~erent embodiments o~ the invention may be made wlthout departing ~rom the spirit thereo~, it is intended that all o~ the matter con-tained in the ~oregoing description, or shown in the accompanying drawing, shall be interpreted as illus-trative rather than limiting.
, ,.
Claims (8)
1. A power line communication system for trans-mitting carrier signals over a distibution power line having high voltage primary and low voltage secondary conductors, said communication system comprising:
a signal amplifier means detecting and processing said carrier signals transmitted on said primary line con-ductor wherein said signal amplifier includes a power supply input; and a power supply means for said signal amplifier means including:
an input means connected to said secondary line conductors, an oscillator circuit means supplied by electric power applied to said input of said power supply means and operating at a frequency substantially higher than the frequency of the applied electric power, an air core transformer having primary and secondary windings conductively coupled together through an air space, first and second tuned circuit means each having a resonant frequency substantially equal to the oscillator frequency, said first tuned circuit means being connected between said oscillator circuit means and said primary winding and said second tuned circuit means being con-nected to said secondary winding, and an output means between said secondary winding and said power supply input of said signal amplifier means whereby said power supply means is effective to supply said signal amplifier means while being electrically isolated from the high voltage of the associated primary line conductor.
a signal amplifier means detecting and processing said carrier signals transmitted on said primary line con-ductor wherein said signal amplifier includes a power supply input; and a power supply means for said signal amplifier means including:
an input means connected to said secondary line conductors, an oscillator circuit means supplied by electric power applied to said input of said power supply means and operating at a frequency substantially higher than the frequency of the applied electric power, an air core transformer having primary and secondary windings conductively coupled together through an air space, first and second tuned circuit means each having a resonant frequency substantially equal to the oscillator frequency, said first tuned circuit means being connected between said oscillator circuit means and said primary winding and said second tuned circuit means being con-nected to said secondary winding, and an output means between said secondary winding and said power supply input of said signal amplifier means whereby said power supply means is effective to supply said signal amplifier means while being electrically isolated from the high voltage of the associated primary line conductor.
2. The communication system of claim 1 wherein said second tuned circuit means includes a first capacitor connected in parallel circuit relationship with the secondary winding.
3. The communication system of claim 1 wherein said first tuned circuit means includes a second capacitor connected in series circuit relationship with the primary winding.
4. The communication system of claim 1 wherein the primary and secondary windings of the air-core transformer are separated at least 5 inches.
5. The communication system of claim 1 wherein the oscillator frequency is greater than ten times the frequency of the power conducted by the secondary distribution line.
6. The communication system of claim 5 wherein the oscillator frequency is greater than 15 kilohertz.
7. A power line carrier communication system comprising:
processing means coupled to a primary distribution line for processing communication signals detected from said line;
an air-core transformer having primary and secondary windings;
said secondary windings being coupled to the pro-cessing means for the purpose of delivering power to the processing means;
an oscillator circuit providing an oscillating signal at a first frequency;
said primary winding being connected to said oscillator circuit;
a first capacitor connected to the secondary winding for providing a secondary circuit which is resonant at said first frequency;
a second capacitor connected to the primary winding for providing a primary circuit which is resonant at said first frequency; and, means for powering the oscillator circuit from a secondary distribution line;
said secondary distribution line having a lower voltage than said primary distribution line, and said first frequency being substantially greater than the frequency of the power conducted by the secondary distribution line.
processing means coupled to a primary distribution line for processing communication signals detected from said line;
an air-core transformer having primary and secondary windings;
said secondary windings being coupled to the pro-cessing means for the purpose of delivering power to the processing means;
an oscillator circuit providing an oscillating signal at a first frequency;
said primary winding being connected to said oscillator circuit;
a first capacitor connected to the secondary winding for providing a secondary circuit which is resonant at said first frequency;
a second capacitor connected to the primary winding for providing a primary circuit which is resonant at said first frequency; and, means for powering the oscillator circuit from a secondary distribution line;
said secondary distribution line having a lower voltage than said primary distribution line, and said first frequency being substantially greater than the frequency of the power conducted by the secondary distribution line.
8. The communication system of claim 7 wherein the primary and secondary windings of the air-core transformer are physically separated from each other sufficiently to provide electrical isolation between the windings at power line frequencies.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US620,444 | 1975-10-07 | ||
| US05/620,444 US4004110A (en) | 1975-10-07 | 1975-10-07 | Power supply for power line carrier communication systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1082329A true CA1082329A (en) | 1980-07-22 |
Family
ID=24485971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA262,768A Expired CA1082329A (en) | 1975-10-07 | 1976-10-05 | Power supply fo power line carrier communication systems |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4004110A (en) |
| JP (1) | JPS5246711A (en) |
| CA (1) | CA1082329A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018175703A1 (en) * | 2017-03-23 | 2018-09-27 | Texas Instruments Incorporated | Low loss galvanic isolation circuitry |
Families Citing this family (70)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| FR816510A (en) * | 1935-01-30 | 1937-08-10 | Materiel Telephonique | Improvements to electrical signaling systems |
| US3459895A (en) * | 1966-05-19 | 1969-08-05 | Itt | Centrally powered subscriber carrier systems |
| US3435358A (en) * | 1966-06-08 | 1969-03-25 | Anaconda Electronics Co | Cable television amplifier powering |
| DE2310885B2 (en) * | 1973-03-05 | 1978-10-26 | Kabel- Und Metallwerke Gutehoffnungshuette Ag, 3000 Hannover | Method for remote direct current supply in a system for the transmission and distribution of high-frequency energy |
-
1975
- 1975-10-07 US US05/620,444 patent/US4004110A/en not_active Expired - Lifetime
-
1976
- 1976-10-05 CA CA262,768A patent/CA1082329A/en not_active Expired
- 1976-10-07 JP JP51119918A patent/JPS5246711A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018175703A1 (en) * | 2017-03-23 | 2018-09-27 | Texas Instruments Incorporated | Low loss galvanic isolation circuitry |
| US10523175B2 (en) | 2017-03-23 | 2019-12-31 | Texas Instruments Incorporated | Low loss galvanic isolation circuitry |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5246711A (en) | 1977-04-13 |
| US4004110A (en) | 1977-01-18 |
| JPS5632815B2 (en) | 1981-07-30 |
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