EP2443758A1 - Amplitude modulated power line communication system and method - Google Patents

Amplitude modulated power line communication system and method

Info

Publication number
EP2443758A1
EP2443758A1 EP10739721A EP10739721A EP2443758A1 EP 2443758 A1 EP2443758 A1 EP 2443758A1 EP 10739721 A EP10739721 A EP 10739721A EP 10739721 A EP10739721 A EP 10739721A EP 2443758 A1 EP2443758 A1 EP 2443758A1
Authority
EP
European Patent Office
Prior art keywords
power line
amplitude modulation
line voltage
voltage
amplitude
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.)
Withdrawn
Application number
EP10739721A
Other languages
German (de)
French (fr)
Inventor
Jozef Sedlák
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2443758A1 publication Critical patent/EP2443758A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/544—Setting up communications; Call and signalling arrangements
    • 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
    • H04B2203/5412—Methods of transmitting or receiving signals via power distribution lines by modofying wave form of the power source

Definitions

  • Electrical connection and method of amplitude modulation for transmission of information in the power line 230 V is related to switchboards, power line cables, appliances and communication between them over the common power line network. This is primarily about dimming control of the lighting via power line cables without additional control cables.
  • Remote control of electrical appliances can be performed in several ways. Most common way is with usage of the additional communication wiring near power line cable. Appliances must be tailored to this function. This means that the appliance with its power circuits contains an input to which the communication wiring is connected. One can influence the activity of the unit through the communication wiring. The necessity for the existence of communication wiring creates a various problem issues in many situations. Therefore, there are methods of wireless communication.
  • radio -frequency communication There is also a method of wireless communications using electromagnetic radio waves, i.e. radio -frequency communication.
  • Each appliance is equipped with radio-frequency receiver and a demodulator so that the received information is properly demodulated and sent to the electric appliance.
  • the systems called ZigBee, Telea work in such way.
  • the new proposed solution does not pose specific requirements of the power line cables. It is simple, robust and resistant to interference.
  • SK UV Nr. 5243 discusses a similar principle, but does not enable demodulators to be addressable, so modulation is difficult to be practiced under this arrangement and there is little tolerance to voltage fluctuations.
  • the essence of the invention lies in the amplitude modulation and demodulation of the power line voltage.
  • the essence is electrical connection to perform amplitude modulation and method of amplitude modulation of the power line voltage 230 V in the power line cables.
  • the electrical connection for amplitude modulation in the power line voltage 230 V consists of modulator block and demodulator block, interconnected by power line cable with the fact that the demodulator block is connected to power control unit block, which is connected to the appliance block.
  • Demodulator block is connected by a switching or control unit of the appliance.
  • the essence of the invention is also method of amplitude modulation of the 230V power line voltage in the power line cables, according to the power line voltage amplitude of the modulator block achieved in a way that modulator block limits the amplitude of the power line voltage during the half period by a level proportional to the voltage modulation depth while the amplitude is limited according to the transmitted instruction.
  • Power line frequency is used as the synchronisation for the information transmission.
  • the demodulator block uses power line voltage half-period amplitude peak as the reference value with power line voltage half-period of opposite polarity amplitude peak information as the information carrier. More periods of power line voltage are used to transfer instruction.
  • Modulation depth is lesser than permissible fluctuation of power line voltage.
  • Modulation clock frequency is synchronized with the power line frequency.
  • the demodulator block is synchronized with the power line frequency.
  • Demodulation process starts with the first half period, the value of which differs from the reference value of the previous half-period and ends with evaluation of defined half-period cycles.
  • the evaluation process consists of two steps, demodulating and demodulated signal decoding.
  • Modulator is in the switchboard from which is the power line voltage distributed.
  • the modulator changes amplitude of the output power line voltage according to the selected protocol synchronously with the power line frequency. Number of amplitude modulation levels may be different. As an advantage, two levels are used for this purpose. The original level (as non- reduced) and reduced by about 5%.
  • Bit word is a combination of reduced and non-reduced supply voltage half periods with the final, defined number. Only one half-period is modulated. The positive or negative half-period is modulated. The second half-period is stable and serves as a reference for the evaluation circuit of the appliance. For reasons of power line voltage fluctuations the reference is required for us. Let us take the negative half-period and positive data period as the reference.
  • the evaluation circuit compares these half-periods. It always scans negative following by its comparison with the positive one. If they are the same, nothing happens. If reduced positive follows the negative, the register is started with a defined number of bit locations. In the case of eight-bit word, there will be eight locations. Levels are assigned to the positive half-period after the register start in this way: same positive half-period is at logical zero level and decreased half-period is at logical one level. After filling the register with the clock frequency synchronized by power line frequency are data transmitted for further processing and for executing commands such as light source dimming. Bit word may have various length and may contain different instructions. Value preceding the start of the register can be used as the reference value of the power line voltage.
  • Amplitude modulation and demodulation with comparison of reference voltage value has higher fault tolerance in power line network.
  • This method of communication is suitable for lighting control, whether internal or external. There is no need for further cable installation. This information gets to the appropriate location over the power line cables.
  • Fig.l there is a principal scheme of amplitude modulation electrical circuit serving to transmit the information over power line cables.
  • Fig.2, Fig.3, Fig.4 there are possible methods of amplitude modulation and evaluating information.
  • amplitude modulation in fig.l consists of a modulator block 1, demodulator block 2, power control unit block 3, appliance block 4, while the power control unit block 3 and appliance block 4 are connected together.
  • Modulator block 1 is connected to demodulator block 2 by the line 5.
  • the modulator affects only the positive half-period. It carries instruction on the value of information. Binary modulation is used. If the positive half-period peak value is equal to the negative - reference half-period, this means logic 0 for the evaluation circuit. If the positive half-period peak value is decreased, it means logical 1. The value of the positive half-period is always compared to the previous negative reference half-period. If the demodulator identifies reduced positive half-period, recording starts automatically in the register. The register records and stores data in amount of 18. Registry operation is clocked by power line frequency. After loading of the necessary number of data, the register passes stored data for processing. Decoding circuit evaluates the incoming series of logical zeros and ones and transmits them to the power control unit.

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)

Abstract

Electrical connection and method of amplitude modulation Electrical connection and method of amplitude modulation of power line voltage is used for wireless information transmission. The solution lies in an appropriate amplitude modulation of power line voltage with subsequent demodulation, while voltage is also used as power supply for appliance. This communication method is suitable for lighting control, whether internal or external without an installation of additional control cables.

Description

AMPLITUDE MODULATED POWER LINE COMMUNICATION SYSTEM AND
METHOD
Technical field
Electrical connection and method of amplitude modulation for transmission of information in the power line 230 V is related to switchboards, power line cables, appliances and communication between them over the common power line network. This is primarily about dimming control of the lighting via power line cables without additional control cables.
The current state of the technology
Remote control of electrical appliances can be performed in several ways. Most common way is with usage of the additional communication wiring near power line cable. Appliances must be tailored to this function. This means that the appliance with its power circuits contains an input to which the communication wiring is connected. One can influence the activity of the unit through the communication wiring. The necessity for the existence of communication wiring creates a various problem issues in many situations. Therefore, there are methods of wireless communication.
One of the most popular methods of the wireless communication and control of electrical appliances is communication over the power lines. Modulation with higher frequency than the frequency of the power supply is used for this communication. It ranges from hundreds of hertz to hundreds of kilo hertz. The frequencies for this use are set out in European standard. Thus is solved the communication called XlO, Minos. The patent Nr. DE 202 15 673 Ul is also solved in this way. Communication may also contain the voltage signs modulated to the supply voltage. However, they also have the character of high frequencies modulated in the supply voltage. Such a method is contained in the patent GB Nr.1153908.
There is also a method of wireless communications using electromagnetic radio waves, i.e. radio -frequency communication. Each appliance is equipped with radio-frequency receiver and a demodulator so that the received information is properly demodulated and sent to the electric appliance. The systems called ZigBee, Telea work in such way.
The biggest disadvantage of the power line communication is high system complexity and thus high cost of implementation. Power line cables are required to be electricaly adapted for functioning signal transmission.
The new proposed solution does not pose specific requirements of the power line cables. It is simple, robust and resistant to interference.
SK UV Nr. 5243 discusses a similar principle, but does not enable demodulators to be addressable, so modulation is difficult to be practiced under this arrangement and there is little tolerance to voltage fluctuations.
Essence of the invention
The essence of the invention lies in the amplitude modulation and demodulation of the power line voltage. The essence is electrical connection to perform amplitude modulation and method of amplitude modulation of the power line voltage 230 V in the power line cables. The electrical connection for amplitude modulation in the power line voltage 230 V consists of modulator block and demodulator block, interconnected by power line cable with the fact that the demodulator block is connected to power control unit block, which is connected to the appliance block. Demodulator block is connected by a switching or control unit of the appliance.
The essence of the invention is also method of amplitude modulation of the 230V power line voltage in the power line cables, according to the power line voltage amplitude of the modulator block achieved in a way that modulator block limits the amplitude of the power line voltage during the half period by a level proportional to the voltage modulation depth while the amplitude is limited according to the transmitted instruction. Power line frequency is used as the synchronisation for the information transmission. The essence of the invention is that the demodulator block uses power line voltage half-period amplitude peak as the reference value with power line voltage half-period of opposite polarity amplitude peak information as the information carrier. More periods of power line voltage are used to transfer instruction. Essence of this method is that the modulation depth is lesser than permissible fluctuation of power line voltage. Modulation clock frequency is synchronized with the power line frequency. Further the essence of the method is that the demodulator block is synchronized with the power line frequency. Demodulation process starts with the first half period, the value of which differs from the reference value of the previous half-period and ends with evaluation of defined half-period cycles. The evaluation process consists of two steps, demodulating and demodulated signal decoding.
Modulator is in the switchboard from which is the power line voltage distributed. The modulator changes amplitude of the output power line voltage according to the selected protocol synchronously with the power line frequency. Number of amplitude modulation levels may be different. As an advantage, two levels are used for this purpose. The original level (as non- reduced) and reduced by about 5%. Bit word is a combination of reduced and non-reduced supply voltage half periods with the final, defined number. Only one half-period is modulated. The positive or negative half-period is modulated. The second half-period is stable and serves as a reference for the evaluation circuit of the appliance. For reasons of power line voltage fluctuations the reference is required for us. Let us take the negative half-period and positive data period as the reference. The evaluation circuit compares these half-periods. It always scans negative following by its comparison with the positive one. If they are the same, nothing happens. If reduced positive follows the negative, the register is started with a defined number of bit locations. In the case of eight-bit word, there will be eight locations. Levels are assigned to the positive half-period after the register start in this way: same positive half-period is at logical zero level and decreased half-period is at logical one level. After filling the register with the clock frequency synchronized by power line frequency are data transmitted for further processing and for executing commands such as light source dimming. Bit word may have various length and may contain different instructions. Value preceding the start of the register can be used as the reference value of the power line voltage.
Amplitude modulation and demodulation with comparison of reference voltage value has higher fault tolerance in power line network.
This method of communication is suitable for lighting control, whether internal or external. There is no need for further cable installation. This information gets to the appropriate location over the power line cables.
Image review
In the Fig.l, there is a principal scheme of amplitude modulation electrical circuit serving to transmit the information over power line cables. In Fig.2, Fig.3, Fig.4 there are possible methods of amplitude modulation and evaluating information.
Examples of implementation
Electrical connection of amplitude modulation in fig.l consists of a modulator block 1, demodulator block 2, power control unit block 3, appliance block 4, while the power control unit block 3 and appliance block 4 are connected together. Modulator block 1 is connected to demodulator block 2 by the line 5.
In Fig.2, there is one of possible modulation and demodulation methods. In this case, the modulator affects only the positive half-period. It carries instruction on the value of information. Binary modulation is used. If the positive half-period peak value is equal to the negative - reference half-period, this means logic 0 for the evaluation circuit. If the positive half-period peak value is decreased, it means logical 1. The value of the positive half-period is always compared to the previous negative reference half-period. If the demodulator identifies reduced positive half-period, recording starts automatically in the register. The register records and stores data in amount of 18. Registry operation is clocked by power line frequency. After loading of the necessary number of data, the register passes stored data for processing. Decoding circuit evaluates the incoming series of logical zeros and ones and transmits them to the power control unit.

Claims

Claims
1. Electrical connection of amplitude modulation in the power line 230V, characterized by the composition of a modulator block 1 and demodulator block (2) interconnected by power line cables (5). The demodulator block 2 is connected to the power control unit block 3 connected to the appliance block (4).
2. Electrical connection of amplitude modulation as having a claim 1 is characterized by the demodulator block (2) connected to a switching unit or control unit of the appliance (4).
3. Amplitude modulation method of power line voltage 230 V in the power line cables is characterized by the fact that amplitude of the modulator block 1 output voltage is achieved by modulator block (1) limiting amplitude of the supply voltage during the half-period, by the level proportional to the voltage modulation depth , the amplitude is limited by transmitted instruction.
4. Amplitude modulation method of power line voltage 230 V in the power line cables according the claim 3 is characterized by power line frequency used as synchronisation for information transmission.
5. Amplitude modulation method of power line voltage 230 V in the power line cables according to the claim 3 is characterized by demodulator block (2) using as the reference value the peak amplitude of power line voltage half-period.
6. Amplitude modulation method of power line voltage 230 V in the power line cables according to the claim 3 is characterized by demodulator block (2) using peak amplitude of power line voltage half-period of the opposite polarity as an information carrier.
7. Amplitude modulation method of power line voltage 230 V in the power line cables according to the claim 3 is characterized by more periods of power line voltage used for instruction transmission.
8. Amplitude modulation method of power line voltage 230 V in the power line cables according to the claim 3 is characterized by the depth of modulation being less than the permitted fluctuation of power line voltage.
9. Amplitude modulation method of power line voltage 230 V in the power line cables according to the claim 3 is characterized by the clock frequency of the modulation being synchronized with the power line frequency.
10. Amplitude modulation method of power line voltage 230 V in the power line cables according to the claim 3 is characterized by the demodulator block (2) being synchronized by the power line frequency.
11. Amplitude modulation method of power line voltage 230 V in the power line cables according to the claim 3 is characterized by the demodulation process starting with the first half- period, of which the value differs from the reference value of the previous half-period and ends with an evaluation of specified number of half-periods.
12. Amplitude modulation method of power line voltage 230 V in the power line cables according to the claim 3 is characterized by the information evaluation process consisting of two steps, signal demodulating and decoding of the demodulated signal.
EP10739721A 2009-06-15 2010-06-14 Amplitude modulated power line communication system and method Withdrawn EP2443758A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SK58-2009U SK5537Y1 (en) 2009-06-15 2009-06-15 Method for amplitude modulation for purpose of information transmission in power line 230V a device for thereof
PCT/SK2010/050010 WO2010147564A1 (en) 2009-06-15 2010-06-14 Amplitude modulated power line communication system and method

Publications (1)

Publication Number Publication Date
EP2443758A1 true EP2443758A1 (en) 2012-04-25

Family

ID=42788880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10739721A Withdrawn EP2443758A1 (en) 2009-06-15 2010-06-14 Amplitude modulated power line communication system and method

Country Status (4)

Country Link
EP (1) EP2443758A1 (en)
RU (1) RU2525854C2 (en)
SK (1) SK5537Y1 (en)
WO (1) WO2010147564A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016114724A1 (en) * 2015-01-16 2016-07-21 Jozef Sedlak Connection for realization of the way of communication in the power line 230v by means of modulation and demodulation of mean value of half cycle of supply voltage

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Publication number Priority date Publication date Assignee Title
US9532433B2 (en) * 2011-10-25 2016-12-27 Philips Lighting Holding B.V. Methods and apparatus for controlling a lighting fixture utilizing a communication protocol
WO2015032882A2 (en) * 2013-09-06 2015-03-12 Koninklijke Philips N.V. Controller for power line coding and power line coding method
DE102015209103A1 (en) * 2015-05-19 2016-11-24 Robert Bosch Gmbh Circuit arrangement and electrical machine with a PLC control
RU2733052C1 (en) * 2020-02-17 2020-09-29 Общество с ограниченной ответственностью "СТК-ВИКОМ" Method of data transmission along power supply lines and device for its implementation
RU2734318C1 (en) * 2020-07-09 2020-10-15 Федеральное государственное бюджетное образовательное учреждение высшего образования Северо-Кавказский горно-металлургический институт (государственный технологический университет) (СКГМИ (ГТУ) Method of receiving and transmitting information over ac power transmission line

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2050383A1 (en) * 1991-08-30 1993-03-01 Arnaldo S. Attallah Power line telecommunication method and system using a very slow modulation of the electrical parameters
WO1999050971A1 (en) * 1998-03-31 1999-10-07 Ceag Sicherheitstechnik Gmbh Method for controlling at least one electric consumer connected to a control device, and a corresponding circuit

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GB1153908A (en) 1966-11-07 1969-06-04 London Electricity Board Information Transmission Systems
AUPQ865900A0 (en) * 2000-07-07 2000-08-03 Cleansun Pty Ltd Power line communications method
IT1320621B1 (en) * 2000-09-05 2003-12-10 Wrap Spa METHOD, SYSTEM AND APPARATUS FOR DATA TRANSMISSION ON THE ELECTRICITY NETWORK
DE20215673U1 (en) 2002-10-11 2003-01-09 Beda Marco Use of a simple lighting switch to transmit coded signals allows different lighting sockets to be activated
WO2005109667A1 (en) * 2004-05-07 2005-11-17 Makoto Taguchi Communication method utilizing power line
RU2290762C1 (en) * 2005-04-18 2006-12-27 Юрий Геннадьевич Чирков Method for generating signal for controlling differentially phase protection of protected part of high voltage electric transmission line
US7729372B2 (en) * 2005-07-27 2010-06-01 Sharp Corporation Communicating in a network that includes a medium having varying transmission characteristics

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2050383A1 (en) * 1991-08-30 1993-03-01 Arnaldo S. Attallah Power line telecommunication method and system using a very slow modulation of the electrical parameters
WO1999050971A1 (en) * 1998-03-31 1999-10-07 Ceag Sicherheitstechnik Gmbh Method for controlling at least one electric consumer connected to a control device, and a corresponding circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2010147564A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016114724A1 (en) * 2015-01-16 2016-07-21 Jozef Sedlak Connection for realization of the way of communication in the power line 230v by means of modulation and demodulation of mean value of half cycle of supply voltage

Also Published As

Publication number Publication date
SK582009U1 (en) 2010-04-07
WO2010147564A1 (en) 2010-12-23
RU2525854C2 (en) 2014-08-20
SK5537Y1 (en) 2010-10-07
RU2012100298A (en) 2013-07-27

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