WO2004046839A1 - A switching circuit for controlling electrical power - Google Patents

A switching circuit for controlling electrical power Download PDF

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Publication number
WO2004046839A1
WO2004046839A1 PCT/GB2003/004985 GB0304985W WO2004046839A1 WO 2004046839 A1 WO2004046839 A1 WO 2004046839A1 GB 0304985 W GB0304985 W GB 0304985W WO 2004046839 A1 WO2004046839 A1 WO 2004046839A1
Authority
WO
WIPO (PCT)
Prior art keywords
switch
state
circuit
output
switching circuit
Prior art date
Application number
PCT/GB2003/004985
Other languages
French (fr)
Inventor
Brian Charles Lewis Scott
Michael James Scott
Original Assignee
Eclipse (Head Quarter Espana) S.L.
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 Eclipse (Head Quarter Espana) S.L. filed Critical Eclipse (Head Quarter Espana) S.L.
Priority to AU2003283591A priority Critical patent/AU2003283591A1/en
Publication of WO2004046839A1 publication Critical patent/WO2004046839A1/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
    • H02J13/0001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission using modification of a parameter of the network power signal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission

Definitions

  • the present invention relates to a switching circuit for controlling the supply of electrical power from an AC voltage supply to a load.
  • a known switching circuit comprises a simple switch having an input terminal connected to a live side of an AC power supply with an output terminal connected to a load, the load being further connected to neutral.
  • the load can, for example only, take the form of a light switch or other switch of an electrical appliance.
  • the simple switch can be a simple mechanical switch in which an arm makes an electrical connection between the input and output terminals (the ON state) or does not make such an electrical connection (the OFF state) .
  • FIG. 1 illustrates a known two way light switching circuit.
  • a first two way switch 1 has an input terminal 2 connected to a live side L of an AC power supply.
  • This switch has a first output terminal 3A connected to a line 4 and a second output terminal 3B connected to a line 5.
  • a blade 1A of the switch either terminal 3A and hence line 4 or terminal 3B and hence line 5 can be connected to the live side.
  • a second two way switch 6 has an output terminal 8 connected to a line 9.
  • This switch has a first input terminal 7A connected to the line 4 and a second input terminal 7B connected to the line 5.
  • a blade 6A of the switch 6 By operation of a blade 6A of the switch 6, either terminal 7A and hence line 4 or terminal 7B and hence line 5 can be connected to line 9.
  • One terminal of a lamp 10 is connected to line 9 whilst the other terminal of lamp 10 is connected to a neutral side N of the AC power supply.
  • this circuit is adequate for simple control via two conventional switches, it has a problem in that providing further switches or controls for the supply of power to the lamp can not be easily achieved without the use of additional wiring. For example, enabling computer controlled operation of the lamp is difficult to achieve. This is because control at each switch in the switching circuit is dependent upon the state of the other switches. For example, if a light was to be set by automated computer control to be ON at a certain time every day, the computer could not easily determine the status of the other switch or switches in the switching circuit. Subsequently due to the status of the other switches, the computer control may actually turn the light OFF or fail to operate at all. Moreover, to provide such automated computer control requires electrical power and as mentioned above, when the switching circuit is in the OFF state, there is no electrical power on line 9 so that an additional power supply must be provided or additional wiring employed.
  • a switching circuit for controlling the supply of electrical power from an AC power supply to a load, the circuit comprising: - a first switch device having an input terminal to be connected to a live side of the AC power supply, and an output terminal, the device having an ON and OFF state; a voltage waveform changing device connected to the first switch device to provide a voltage waveform at said output which changes according to the ON/OFF state of the first switch device; a second switch device connectable between said output terminal and the load and having an ON/OFF state to electrically connect and disconnect the load with said output terminal; and a waveform detector circuit connected to detect the change in voltage waveform at said output terminal and providing an output for switching the state of the second switch device, the output changing according to detected changes in the voltage waveform at said output terminal.
  • Figure 1 shows a known two way switched lighting circuit
  • Figure 2 is a schematic diagram of a switching circuit embodying the present invention with a first switch in an ON state ;
  • Figure 3 is a schematic diagram of a switching circuit embodying the present invention with a first switch in an OFF state
  • a switch device 20 comprises a single switch which has an input terminal 21 connected to a live side L of an AC power supply.
  • the output terminal 22 of the switch 20 is connected to a line 23.
  • a pair of back to back diodes 24 are connected across the terminals 21 and 22.
  • a blade 20A can be selectively operated by hand to move from a position not providing an electrical connection between terminals 21 and 22 to a position providing an electrical connection between terminals 21 and 22.
  • Reference numeral 25 illustrates the voltage waveform on line 23 when the blade 20A connects terminals 21 and 22 and reference numeral 26 illustrates the voltage waveform on line 23 when the blade 20A does not connect terminals 21 and 22.
  • the line 23 is connected to an input terminal of a second switching device 30 which is connected via a line 31 to a load (not shown) which is further connected to neutral.
  • the second switch 30 is connected between the output terminal of the switch 20 and the load.
  • the second switching device takes the form of a triac switch having a control terminal 32 for switching the triac between an ON and OFF state to control the supply of electrical power to the load.
  • a line 33 is connected to line 23 and a bridge rectifier and signal conditioning circuit 34. This in effect creates a positive only 100 Hz signal which is passed to a waveform detector circuit 36.
  • a bridge rectifier and signal conditioning circuit 34 This in effect creates a positive only 100 Hz signal which is passed to a waveform detector circuit 36.
  • reference numeral 35 in figure 2 when the blade 20A connects terminals 21 and 22 there is zero time between the fall of one cycle in the mains and the rise of the next cycle.
  • reference numeral 37 in figure 3 when the blade 20A does not connect terminals 21 and 22 there is a small delay between the fall of one cycle and the start of the next.
  • the waveform detector circuit 36 detects this difference and provides an output to an input of a logic circuit 38 which represents a change in the state of switch 20.
  • the logic circuit 38 includes another input connected to the output of a radio transmitter 39 which receives a signal from a remotely located further switch having an ON/OFF state. In a similar manner, the input to the logic circuit represents a change in the state of the further switch.
  • the circuit shown in figures 2 and 3 operates to make the triac 30 toggle between an ON and OFF state (i.e. closed and open state) every time there is a change in the input to the logic circuit 38.
  • ON and OFF state i.e. closed and open state
  • this change in waveform is detected and manifests as a change to the input to the logic circuit 38.
  • This change is detected and alters the state of the triac 30.
  • the current state is changed by operation of switch 20.
  • a similar function is achieved when a change in the state of the remote switch is communicated to the radio transmitter which manifests as a change to the input in logic circuit 38.
  • the present invention is capable of considerable modification, the detailed embodiments of which will be readily apparent to those skilled in the art.
  • the back to back diodes can be replaced by other components which provide a modified voltage waveform on line 23 between the two states of switch 20 shown in figures 2 and 3.
  • inductive components can be used.
  • the triac 30 is one example of an electrically operated switch and other forms of switches can be used, for example a mechanical relay.
  • the load that is switched can take many forms.
  • the switch can form a part of a domestic or industrial appliance.
  • the present invention has been described with reference to ON and OFF states.
  • the present invention provides the advantage that the circuits 34, 36 and 38 are always provided with power on line 23 so that batteries are not required or a separate power supply or additional wiring.

Abstract

A two way light switching circuit comprises a first single switch (20) having a blade (20A) for making and breaking an electrical connection between a live side L and a line (23). A pair of back to back diodes (24) are connected across the switch so that there is a gap in the AC sine wave at the zero crossing point (26) when the blade breaks the connection. The line (23) connects to a second switching device (30) further connected to neutral via a line (31) and a load. A bridge rectifier and signal conditioning circuit (34) creates a positive only 100 Hz signal which is passed to a waveform detector circuit (36) to detect the small delay at the zero crossing point and provide an output representing a change in the state of the first switch (20). The output is provided to a logic circuit (38) having another input from a radio transmitter (39) which receives a signal from a remotely located further switch having an ON/OFF state and provides an output representing a change in the state of the further switch. The circuit therefore operates to make the second switch (30) toggle between an ON and OFF state (i.e. closed and open state) every time there is a change in the input to the logic circuit (38).

Description

A SWITCHING CIRCUIT FOR CONTROLLING ELECTRICAL POWER
[001] The present invention relates to a switching circuit for controlling the supply of electrical power from an AC voltage supply to a load.
[002] A known switching circuit comprises a simple switch having an input terminal connected to a live side of an AC power supply with an output terminal connected to a load, the load being further connected to neutral. The load can, for example only, take the form of a light switch or other switch of an electrical appliance. The simple switch can be a simple mechanical switch in which an arm makes an electrical connection between the input and output terminals (the ON state) or does not make such an electrical connection (the OFF state) .
[003] One of the problems of such a switching circuit is that there is no supply of current at the output terminal of the simple switch in the OFF state so that there is no electrical power available for use in the circuit beyond the simple switch, for example by a further control system. If power is required, it is necessary to provide additional wiring.
[004] A further problem arises in a two way switching circuit. Figure 1 illustrates a known two way light switching circuit. In this case, a first two way switch 1 has an input terminal 2 connected to a live side L of an AC power supply. This switch has a first output terminal 3A connected to a line 4 and a second output terminal 3B connected to a line 5. By operation of a blade 1A of the switch 1, either terminal 3A and hence line 4 or terminal 3B and hence line 5 can be connected to the live side.
[005] A second two way switch 6 has an output terminal 8 connected to a line 9. This switch has a first input terminal 7A connected to the line 4 and a second input terminal 7B connected to the line 5. By operation of a blade 6A of the switch 6, either terminal 7A and hence line 4 or terminal 7B and hence line 5 can be connected to line 9. [006] One terminal of a lamp 10 is connected to line 9 whilst the other terminal of lamp 10 is connected to a neutral side N of the AC power supply.
[007] As is known in the art, by virtue of movement of the blades 1A and 6A of either switches 1 or 6 it is possible to selectively complete or break an electrical circuit from the live side to the neutral side through the lamp 10.
[008] Although this circuit is adequate for simple control via two conventional switches, it has a problem in that providing further switches or controls for the supply of power to the lamp can not be easily achieved without the use of additional wiring. For example, enabling computer controlled operation of the lamp is difficult to achieve. This is because control at each switch in the switching circuit is dependent upon the state of the other switches. For example, if a light was to be set by automated computer control to be ON at a certain time every day, the computer could not easily determine the status of the other switch or switches in the switching circuit. Subsequently due to the status of the other switches, the computer control may actually turn the light OFF or fail to operate at all. Moreover, to provide such automated computer control requires electrical power and as mentioned above, when the switching circuit is in the OFF state, there is no electrical power on line 9 so that an additional power supply must be provided or additional wiring employed.
[009] It is an object of the present invention to provide a switching circuit whereby the ON/OFF state of the switches can be distinguished whilst maintaining a supply of power on the output side of the circuit.
[0010] According to the present invention there is provided a switching circuit for controlling the supply of electrical power from an AC power supply to a load, the circuit comprising: - a first switch device having an input terminal to be connected to a live side of the AC power supply, and an output terminal, the device having an ON and OFF state; a voltage waveform changing device connected to the first switch device to provide a voltage waveform at said output which changes according to the ON/OFF state of the first switch device; a second switch device connectable between said output terminal and the load and having an ON/OFF state to electrically connect and disconnect the load with said output terminal; and a waveform detector circuit connected to detect the change in voltage waveform at said output terminal and providing an output for switching the state of the second switch device, the output changing according to detected changes in the voltage waveform at said output terminal.
[0011] Additional features of the present invention are described in the subsidiary claims.
[0012] Examples of the present invention will now be described with reference to the accompanying drawings, in which: -
[0013] Figure 1 shows a known two way switched lighting circuit;
[0014] Figure 2 is a schematic diagram of a switching circuit embodying the present invention with a first switch in an ON state ; and
[0015] Figure 3 is a schematic diagram of a switching circuit embodying the present invention with a first switch in an OFF state;
[0016] Referring to figures 2 and 3, these show a two way light switching circuit. In this case a switch device 20 comprises a single switch which has an input terminal 21 connected to a live side L of an AC power supply. The output terminal 22 of the switch 20 is connected to a line 23. A pair of back to back diodes 24 are connected across the terminals 21 and 22. A blade 20A can be selectively operated by hand to move from a position not providing an electrical connection between terminals 21 and 22 to a position providing an electrical connection between terminals 21 and 22. Reference numeral 25 illustrates the voltage waveform on line 23 when the blade 20A connects terminals 21 and 22 and reference numeral 26 illustrates the voltage waveform on line 23 when the blade 20A does not connect terminals 21 and 22. Although shown in exaggerated form, it can be seen at waveform 26 that there is a gap in the AC sine wave at the zero crossing point. This arises as the diodes are slow starting and introduce a minor delay at the start of each cycle. Thus, the diodes 24 are connected to the switch 20 to operate to change the voltage waveform at the output thereof according to the position of the blade 20A, in effect the ON/OFF state of switch. It should be noted though that in both positions of the blade 20A voltage and hence power is still provided on line 23.
[0017] The line 23 is connected to an input terminal of a second switching device 30 which is connected via a line 31 to a load (not shown) which is further connected to neutral. Thus, the second switch 30 is connected between the output terminal of the switch 20 and the load. In the present embodiment, the second switching device takes the form of a triac switch having a control terminal 32 for switching the triac between an ON and OFF state to control the supply of electrical power to the load.
[0018] A line 33 is connected to line 23 and a bridge rectifier and signal conditioning circuit 34. This in effect creates a positive only 100 Hz signal which is passed to a waveform detector circuit 36. As shown at reference numeral 35 in figure 2, when the blade 20A connects terminals 21 and 22 there is zero time between the fall of one cycle in the mains and the rise of the next cycle. However, as shown at reference numeral 37 in figure 3, when the blade 20A does not connect terminals 21 and 22 there is a small delay between the fall of one cycle and the start of the next.
[0019] The waveform detector circuit 36 detects this difference and provides an output to an input of a logic circuit 38 which represents a change in the state of switch 20.
[0020] The logic circuit 38 includes another input connected to the output of a radio transmitter 39 which receives a signal from a remotely located further switch having an ON/OFF state. In a similar manner, the input to the logic circuit represents a change in the state of the further switch.
[0021] Accordingly, the circuit shown in figures 2 and 3 operates to make the triac 30 toggle between an ON and OFF state (i.e. closed and open state) every time there is a change in the input to the logic circuit 38. Thus, when the switch 20 is changed from the state in figure 2 passing normal mains to line 23 to the state in figure 3 where a delay is introduced into the mains waveform, this change in waveform is detected and manifests as a change to the input to the logic circuit 38. This change is detected and alters the state of the triac 30. Thus, the current state is changed by operation of switch 20. A similar function is achieved when a change in the state of the remote switch is communicated to the radio transmitter which manifests as a change to the input in logic circuit 38.
[0022] It will be appreciated that such a function can be achieved from the two way switch circuit of figure 1 by connecting the two back to back diodes 24 across lines 4 and 5.
[0023] It will also be appreciated that the present invention is capable of considerable modification, the detailed embodiments of which will be readily apparent to those skilled in the art. For example the back to back diodes can be replaced by other components which provide a modified voltage waveform on line 23 between the two states of switch 20 shown in figures 2 and 3. By way of example, inductive components can be used. The triac 30 is one example of an electrically operated switch and other forms of switches can be used, for example a mechanical relay. [0024] Whilst a light has been described in the specific example, the load that is switched can take many forms. For example only, the switch can form a part of a domestic or industrial appliance. The present invention has been described with reference to ON and OFF states. It will be apparent that this term has been used to assist in understanding that the switches in question are changed from one state to another. [0025] The present invention provides the advantage that the circuits 34, 36 and 38 are always provided with power on line 23 so that batteries are not required or a separate power supply or additional wiring.

Claims

[0026] 1. A switching circuit for controlling the supply of electrical power from an AC power supply to a load, the circuit comprising: - a first switch device having an input terminal to be connected to a live side of the AC power supply, and an output terminal, the device having an ON and OFF state; a voltage waveform changing device connected to the first switch device to provide a voltage waveform at said output which changes according to the ON/OFF state of the first switch device; a second switch device connectable between said output terminal and the load and having an ON/OFF state to electrically connect and disconnect the load with said output terminal; and a waveform detector circuit connected to detect the change in voltage waveform at said output terminal and providing an output for switching the state of the second switch device, the output changing according to detected changes in the voltage waveform at said output terminal.
[0027] 2. A switching circuit according to claim 1 wherein said second switch device includes a control terminal for changing the state thereof. [0028] 3. A switching circuit according to claim 2 wherein the waveform detector circuit is connected to the control terminal.
[0029] 4. A switching circuit according to claim 2 further comprising a switch operation circuit and a logic circuit; wherein the logic circuit has an input connected to an output of the switch operation circuit, an input connected to the output of the waveform detector circuit, and an output connected to the control terminal of the second switch device whereby a change of either input effects a change in the output of the logic circuit for changing the state of the second switch device. [0030] 5. A switching circuit according to claim 4 wherein the switch operation circuit comprises a radio or infrared receiver which changes the output of the switch operation circuit in response to a change in state of a third switch. [0031] 6. A switching circuit according to any preceding claim wherein the voltage waveform changing device introduces a delay during each wave form cycle for one state of the first switch device.
[0032] 7. A switching circuit according to claim 6 wherein the switch operation circuit comprises a forward bias circuit.
[0033] 8. A switching circuit according to claim 7 wherein the forward bias circuit comprises a pair of back to back diodes. [0034] 9. A switching circuit according to claim 6 wherein the voltage waveform changing device comprises inductive components.
[0035] 10. A switching circuit according to any preceding claim wherein said first switch device comprises a pair of two way switches connected together.
[0036] 11. A switching circuit according to any preceding claim wherein said second switch device comprises a triac or a relay.
[0037] 12. A switching circuit according to any preceding claim wherein the waveform detector circuit includes a bridge rectifier.
PCT/GB2003/004985 2002-11-16 2003-11-17 A switching circuit for controlling electrical power WO2004046839A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003283591A AU2003283591A1 (en) 2002-11-16 2003-11-17 A switching circuit for controlling electrical power

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0226802.7A GB0226802D0 (en) 2002-11-16 2002-11-16 Switch status detection
GB0226802.7 2002-11-16

Publications (1)

Publication Number Publication Date
WO2004046839A1 true WO2004046839A1 (en) 2004-06-03

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Application Number Title Priority Date Filing Date
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AU (1) AU2003283591A1 (en)
GB (1) GB0226802D0 (en)
WO (1) WO2004046839A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1031408C2 (en) * 2005-12-07 2010-09-07 Inst Information Industry ELECTRONIC SWITCH DEVICE WITH NON-INTERRUPTABLE VOLTAGE CONTROLLER.
GB2527134A (en) * 2014-06-14 2015-12-16 Alexander Joseph Dawood A light switch interface for electronic devices fitted into a light fitting

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4746809A (en) * 1986-10-30 1988-05-24 Pittway Corporation AC power line signaling system
US5541584A (en) * 1992-05-15 1996-07-30 Hunter Fan Company Remote control for a ceiling fan
GB2298553A (en) * 1995-02-21 1996-09-04 Robert William Moore Remote control system; smoke alarms combined with lights

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4746809A (en) * 1986-10-30 1988-05-24 Pittway Corporation AC power line signaling system
US5541584A (en) * 1992-05-15 1996-07-30 Hunter Fan Company Remote control for a ceiling fan
GB2298553A (en) * 1995-02-21 1996-09-04 Robert William Moore Remote control system; smoke alarms combined with lights

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1031408C2 (en) * 2005-12-07 2010-09-07 Inst Information Industry ELECTRONIC SWITCH DEVICE WITH NON-INTERRUPTABLE VOLTAGE CONTROLLER.
GB2527134A (en) * 2014-06-14 2015-12-16 Alexander Joseph Dawood A light switch interface for electronic devices fitted into a light fitting

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Publication number Publication date
GB0226802D0 (en) 2002-12-24
AU2003283591A1 (en) 2004-06-15

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