Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B3/00—Line transmission systems
  • H04B3/54—Systems for transmission via power distribution lines
• • G—PHYSICS
  • G08—SIGNALLING
  • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
  • G08C19/00—Electric signal transmission systems
• • G—PHYSICS
  • G08—SIGNALLING
  • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
  • G08C19/00—Electric signal transmission systems
  • G08C19/16—Electric signal transmission systems in which transmission is by pulses
  • G08C19/22—Electric signal transmission systems in which transmission is by pulses by varying the duration of individual pulses
• • 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
  • H04B2203/5425—Methods of transmitting or receiving signals via power distribution lines improving S/N by matching impedance, noise reduction, gain control
• • 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
  • H04B2203/5429—Applications for powerline communications
  • H04B2203/5433—Remote metering
• • 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
  • H04B2203/5429—Applications for powerline communications
  • H04B2203/5441—Wireless systems or telephone
• • 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
  • H04B2203/5429—Applications for powerline communications
  • H04B2203/5445—Local network
• • 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
  • H04B2203/5429—Applications for powerline communications
  • H04B2203/5458—Monitor sensor; Alarm systems

Definitions

• the present invention relates to a data transmission apparatus through a network, and more particularly, to an asynchronous power line transmission apparatus for transmitting an impulse radio data signal through a power line.
• Power line communication refers to a communication method using an AC 110V/220V power line as a communication media, for which communication equipments are communicated through the power line without installation of an extra telephone line or a dedicated line for data communication.
• a power line transmission apparatus in use for the power line communication is applied to a high-speed power line communication modem, a power line communication unit of various sensors or driving apparatus, a unit of a sensor for measuring the physical quantity of electric power water or gas, a power line communication unit for constructing a high speed communication network (i.e., LAN, etc ) or for an industrial automation, or an applied field such as an Internet automatic telemetering
• the power line communication systems employ a carrier synchronizing method to per orm communication
• the communication method such as the FSK or the PSK adopted between transmitting/receiving terminals is disadvantageous in that due to the noise environment around the power line and the loading l effects of various loads connected to the power line the impedance that is a line constant, is much varied, so that a signal transmission rate is low and a signal detection is not so reliable
• the low signal transmission rate through the power line and the low reliability in the signal detection are also resulted from a difficulty in synchronously 0 controlling a signal transmitted through the power line because of the hne characteristics change as a transmission channel or the noise
• the communication system should be noise- resistant and the problem of the synchronization controlling should be solved.
• the present invention proposes a method of transmitting a 1 -cycle sinusoidal shock pulse (referred to as an 'impulse data signal, hereinafter), that is, an 5 impulse data signal.
• a 'impulse data signal referred to as an 'impulse data signal, hereinafter
• the impulse data signal refers to a signal of which time average is O' and its pulse time width is below scores of [nsec], having characcteristics that it is evenly transmitted regardless of variation of the impedance, that is, a line constant, due to the environmental noise 10 of the power line, working and variation of loads of various electrical devices
• an object of the present invention is to provide an asychronous power line transmission apparatus which is capable of transmitting a data at an ultra-high speed with reliability by employing a i signal detecting method of asychronous system for the impulse data signal transmitting method, and capable of simply constructing a transmitting/receiving apparatus
• an asynchronous power line transmission apparatus including a transmitting circuit having an impulse data signalizing circuit for converting a transfer data pulse from a digital terminal such as a personal computer to an impulse data signal and transmitting the impulse data signal to the other party through a power line, and a receiving circuit having an amplifying and level clipping unit for receiving an impulse data signal transmitted from the 5 other party through the power line by its receiving terminal, removing a noise amplifying the impulse data signal to a certain level and clipping the impulse data signal by above a certain level, an impulse data signal separating and detecting unit for separating a positive (+) impulse and a negative (-) impulse of a transferred pulse corresponding a positive
• a pulse reproducing unit for setting the positive (+) pulse interval of the impulse data signal separating and detecting unit as a positive (+) set pulse and the negative (-) pulse interval as a positive (+) reset pulse, arranging the pulses to set-reset pair of pulses and reset-set pair of pulses corresponding to 1 -cycle i s impulse data signal on time basis, selecting only a first pulse of each pair of pulses so that if the selected pulse is a set pulse a high level signal pulse is generated while if the selected pulse is a reset pulse, a low level pulse signal is generated, to thereby reproduce a transfer data pulse signal and transmit it to a PC interface 0
• the positive edge and the negative edge of the data pulse are converted to an impulse data signal having a mutually inverted potential to be transmitted so that the transmission characteristics are constantly maintained regardless of the background noise around the power line or the load variation of the power line
• the impulse noise pulse can be separated with the impulse data signal of a high frequency
• a noise removing unit that employs a cascaded 2-stage processing frequency separating method in consideration of even a random particular noise, a i s reliability in reproducing the data pulse by the data pulse reproducing unit is highly improved and a ultra-high data transmission can be accomplished by the transceiver system of the impulse data signal having the duration of below [nsec]
• Figure 1 is a schematic view showing a construction of a network adopting a general power line transfer system in accordance with a conventional art
• Figure 2 is a schematic view showing a construction of a power line transmission apparatus in accordance with the present invention.
• FIG. 3 is a view showing waveforms of input and output signal of each circuit of Figure 2 in accordance with the present invention
• Figure 1 is a schematic view showing a construction of a network adopting a general power line transmission system which includes a single-phase two-wire power line 104 for supplying power, power line transmitting/receiving devices 103 and 105 for transmitting and receiving data through the power line 104, and interface units 102 and 106 for transmitting and receiving data between terminal equipments such as personal computers 101 and 107.
• Figure 2 is a schematic view showing a construction of a power line transmission apparatus in accordance with the present invention
• the asychronous power line transmission apparatus of the present invention includes a transmitting circuit consisting of an impulse circuit 130 for respectively converting a positive edge and a negative edge of an output pulse to an impulse pulse (an impulse signal) having a constant duration so as to transfer a data pulse transmitted by a clock generator of a predetermined frequency and an impulse data signal circuit 135 for receiving the impulse signal and converting it to an impulse data signal suitable for transmission through a power line 140, a receiving circuit consisting of a receiving signal transforming and noise removing unit 150 for receiving the impulse data signal transmitted from the other party (impulse data signal circuit 135) through the power line 140 and removing its noise, an amplifying and level clipping unit 160 for amplifying the impulse data signal outputted from the receiving signal transforming and noise removing unit 150 to a certain level and clipping the amplified impulse data signal by above a certain level to remove a noise again, an impulse data signal separating and detecting unit 170 for separating the output signal from the amplifying and level clipping unit 160 into
• the impulse data signal circuit 135 includes a pulse transformer
• the impulse signal outputted from the impulse data signal circuit 135 is a shock pulse signal of 1 -cycle or of 1/2-cycle sinusoidal that has been mutually phase-inverted
• the impulse circuit of the transmitting circuit When a data pulse as shown in Figure 3A is generated and transmitted by a clock generator of the PC 110 having a certain data transmission rate through the interface 120 to the transmitting circuit, the impulse circuit of the transmitting circuit generates a positive (+) impulse having a predetermined duration corresponding to the positive edge and the negative edge of the data pulse and outputs it to the impulse data signal circuit 135 Upon receipt of the impulse signal from the impulse circuit 130, as shown in Figure 3B, the impulse data signal circuit 135 converts the positive edge of the data pulse to an impulse data signal with 1 cycle of positive (+) and negative (-) (or 1/2 cycle of positive (+)) having a certain duration from scores of pico seconds ([psec]) to scores of nano seconds ([nsec])
• the impulse data signal circuit 135 converts the negative edge of the data pulse to a phase-inverted (the opposite to the phase of a signal obtained from the positive edge) impulse data signal with 1 cycle of negative (-) and positive (+) (or 1/2 cycle of negative (-)) having a certain duration from scores of pico seconds ([psec] to scores of nano seconds ([nsec])
• the impulse data signal circuit 135 transmits the generated impulse data signal through the power line 140 to the other party
• the receiving signal transforming and noise removing unit 150 The receiving signal transforming and noise removing unit 150
• the amplifying and level clipping unit 160 Upon receipt of the impulse data signal from the receiving signal transforming and noise removing unit 150, the amplifying and level clipping unit 160 amplifies the impulse data signal to a certain level and clips the amplified impulse data signal to have a signal above a certain level so as to remove a noise
• the positive (+) clipping impulse data signal as shown in Figure 3C
• the negative (-) clipping impulse data signal as shown in Figure 3D
• the impulse data signal separating and detecting unit 170 outputs the positive (+) impulse and the negative (-) impulse (a set signal and a reset signal) that were separated and detected by the amplifying and level clipping unit 160 to the data pulse reproducing unit 180
• the data pulse reproducing unit 180 arranges the positive (+) pulse and the negative pulse (-) (the set signal and the reset signal) as separated and detected as a pair of the positive (+) set and reset pulses and a pair of the positive (+) reset and a set pulses corresponding to the 1 -cycle impulse data signal on a time basis
• the data pulse reproducing unit 180 selects only a first pulse of each pulse pair, so that when the selected pulse is a set pulse the data pulse reproducing unit 180 generates a high level pulse signal while the selected pulse is a reset pulse, it generates a low level pulse signal, to thereby reproduce the data pulse signal transmitted through the power line and output the reproduced data pulse signal through the interface unit 120 to the PC 110
• the asynchronous power line transmission apparatus transmits and receives the data through the power line
• the amplitude of the random impulsive noise pulse that may be generated when a load of the power line is varied has a high level of about 20 ⁇ 50dB, higher by 10-300 times than the amplitude of the power line background noise having an amplitude of micro voltage unit ([ ⁇ V]), and the time-width of the impulsive noise pulse has a low frequency characteristic represented in a micro seconds ([ ⁇ sec]) But since the time-width of the impulse data signal has a high frequency characteristic below scores of nano seconds ([nsec]), the noise pulse can be removed by filtering through the frequency separating method
• the noise removing unit adopting the cascaded two-stage processing of frequency separating method in consideration of even the random particular noise completely removes the noise, so that the data pulse reproducing unit can reproduce the reliable data pulse Also, the data can be transmitted at an ultra-high speed owing to the transmitting method that transmits the impulse data signal having a time-width of below scores of nano seconds ([nsec])
• asynchronous power line transmission apparatus of the present invention thanks to the low signal attenuation characteristic of the power line and little signal decaying effect in an electric concentric-plug with respect to the impulse data signal transmitted having a certain time-width, a low level signal can be transmitted through the power line Also since the level of the transmitted signal is low, an electromagnetic interference (EMI) problem does not occur, and when the data is transmitted to a remote location, its constant signal transmission characteristic can be maintained
• the asynchronous power line transmission apparatus can be applied to an ultra-high speed power line communication network (LAN) construction within 2-3 km radius, a CCTV network construction, a factory automation construction, an underground wireless relay network construction, and home appliance information network construction, or also can be applied to control various electromechanical apparatus and to a telemetering field
• LAN ultra-high speed power line communication network
• CCTV network construction within 2-3 km radius
• factory automation construction a factory automation construction
• underground wireless relay network construction an underground wireless relay network construction
• home appliance information network construction or also can be applied to control various electromechanical apparatus and to a telemetering field

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• 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)
• Arrangements For Transmission Of Measured Signals (AREA)
• Dc Digital Transmission (AREA)

Applications Claiming Priority (3)

Publications (1)

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ID=19612453

Family Applications (1)

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• 1999
  • 1999-09-21 KR KR1019990040687A patent/KR100336638B1/ko not_active IP Right Cessation
• 2000
  • 2000-01-22 AU AU23292/00A patent/AU2329200A/en not_active Abandoned
  • 2000-01-22 IL IL13942300A patent/IL139423A0/xx unknown
  • 2000-01-22 EP EP00902167A patent/EP1135758A1/de not_active Withdrawn
  • 2000-01-22 WO PCT/KR2000/000048 patent/WO2001022380A1/en not_active Application Discontinuation
  • 2000-01-22 CN CN00801047A patent/CN1314031A/zh active Pending
  • 2000-01-22 JP JP2001525666A patent/JP2003510867A/ja active Pending
  • 2000-08-29 TW TW089117454A patent/TW488137B/zh active

Non-Patent Citations (1)

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