WO2014086360A1 - Led tubes with safety circuit and use - Google Patents

Led tubes with safety circuit and use Download PDF

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Publication number
WO2014086360A1
WO2014086360A1 PCT/DK2013/000082 DK2013000082W WO2014086360A1 WO 2014086360 A1 WO2014086360 A1 WO 2014086360A1 DK 2013000082 W DK2013000082 W DK 2013000082W WO 2014086360 A1 WO2014086360 A1 WO 2014086360A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
led
terminals
led tube
luminaire
Prior art date
Application number
PCT/DK2013/000082
Other languages
French (fr)
Inventor
Peder Pedersen
Original Assignee
Neoline A/S
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 Neoline A/S filed Critical Neoline A/S
Publication of WO2014086360A1 publication Critical patent/WO2014086360A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/02—Safety devices structurally associated with lighting devices coming into action when lighting device is disturbed, dismounted, or broken
    • F21V25/04—Safety devices structurally associated with lighting devices coming into action when lighting device is disturbed, dismounted, or broken breaking the electric circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/27—Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/357—Driver circuits specially adapted for retrofit LED light sources
    • H05B45/3578—Emulating the electrical or functional characteristics of discharge lamps
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/26—Circuit arrangements for protecting against earth faults
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • 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
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the invention relates to an LED-tube for light emission with electrical terminals al, a2 in one tube end and electrical terminals bl, b2 in the opposite tube end, where the LED tube between the al, a2 and bl, b2 terminals are provided with electronic circuits, such as in the form of a number, preferably two, diode bridges and an LED module that comprises a number of light-emitting diodes, and where the LED tube can be installed in a fluorescent tube luminaire with a Starter and a Ballast in which the LED tube is provided with a safety circuit that only switches on the electric current between the electrical terminals al, a2 and bl, b2 when the LED tube is properly installed in a fluorescent tube luminaire.
  • the invention relates to the use of LED tubes.
  • Gas-filled fluorescent tubes are designed so that they work no matter how they are directed in the luminaire. It is possible even to insert one end of the tube in the luminaire, with the power on, without applying a voltage at the other end of the tube, since the gas inside the tube is non-conductive before the tube is properly installed and started.
  • LED tubes is produced that can be placed in fluorescent tube luminaires and thus substituere the fluorescent tubes.
  • LED tubes is different from fluorescent tubes in that the LED tubes do not contain a gas, but rather a number of LEDs (Light Emitting Diode) and an electric circuit connected to the terminals at both ends of the tube to ensure compatibility with existing fluorescent tube luminaires.
  • LEDs Light Emitting Diode
  • LED tube discloses an LED tube, where the LED tube can be installed in a fluorescent tube luminaire with a Starter and a Ballast, and the LED tube is provided with a safety circuit that only opens for the electrical current between the electrical terminals when the LED tube is properly installed in the fluorescent tube luminaire .
  • an LED tube of the type indicated in the preamble of claim 1 where the LED tube is characterized in that the safety circuit comprises a diode bridge, which is operated by al, a2 terminals and which controls a switch that is placed in series with the LED module.
  • the safety circuit comprises a diode bridge, which is operated by al, a2 terminals and which controls a switch that is placed in series with the LED module.
  • the invention also relates to the use of LED tubes for substitution of fluorescent tubes.
  • Fig. 1 shows a conventional LED tube that is placed in a fluorescent tube luminaire, which comprises a Starter and a Ballast.
  • Fig. 1.1 shows a schematic drawing of the electrical circuit which is embedded in the LED tube of Fig. 1
  • Fig. 2 shows a conventional LED tube, where only the one set of end terminals are placed in the fluorescent tube luminaire, and where a current may flow through the tube to the free end terminals, with the risk that the service man is exposed to an electrical shock.
  • Fig. 2.1 shows a schematic drawing of the electrical circuit which is embedded in the LED tube of Fig. 2, indicating the current that can flow through the LED tube.
  • Fig. 3 shows a schematic drawing of a safety circuit for an LED tube made in accordance with the invention.
  • Fig. 4 shows an LED tube made in accordance with the invention which is placed in a fluorescent tube luminaire, which comprises a Starter and a Ballast.
  • Fig. 4.1 shows a schematic drawing of the electrical circuit which is embedded in the LED tube of Fig. 4, indicating the current flowing in the circuit.
  • Fig. 5 shows an LED tube made in accordance with the invention wherein only the one set of end terminals are placed in the fluorescent tube luminaire but where a current cannot flow through the tube to the free end terminals.
  • Fig. 5.1 shows a schematic drawing of the electrical circuit which is embedded in the LED tube of Fig. 5 indicating the current flowing in the circuit.
  • Fig. 6 shows an LED tube made in accordance with the invention with switches for disconnecting the flow through the Starter and with circuit for compensating the energy supply to the LEDs.
  • Fig. 7 shows a safety circuit disengaging the Starter after startup .
  • an LED tube is designated with the numeral 1 that internally is traditionally structured as shown in the schematic diagram Fig. 1.1.
  • the LED tube 1 is placed in a fluorescent tube luminaire, comprising a so-called starter which in the location of the LED tube 1 shown in Fig. 1 is placed between terminals al and bl of the LED tube 1.
  • the fluorescent tube luminaire is further provided with a so- called ballast, which is placed between the L terminal of the lighting mains and a terminal a2 of the LED tube 1.
  • a terminal b2 of the LED tube 1 is in the location of the LED tube 1 shown in Fig. 1 connected to the N (Neutral) terminal of the lighting mains.
  • the fluorescent tube luminaire 1 as shown in Fig. 1 can be shielded by connection to earth (PE) .
  • Fig. 1.1 shows a schematic diagram of the electrical circuit, which is enclosed in the internal structure of the LED tube 1.
  • the end terminals al, a2 of the LED tube 1 are connected to a diode bridge 6, which output terminals are connected to a LED module 7, which comprises the light-emitting diodes that give light when the LED tube 1 is activated.
  • the output terminals of the diode bridge. 6 are connected to a diode bridge 8, which other two terminals are connected to the terminals bl, b2 of the two LED tubes 1.
  • Fig. 1.1 the electric current through the LED tube 1 is indicated at 5.
  • Fig. 2 shows an LED tube 1, which is only installed at the one end to the terminals al, a2, such that the terminals bl, b2 are free and can be touched by a user or service man.
  • the situation as shown in Fig. 2 can occur during installation or removal of an LED tube 1 in or from a fluorescent tube luminaire . If the fluorescent tube luminaire, which is in the situation shown in Fig. 2, is connected to the lighting mains, an electric current 9 will flow through the LED tube 1 in case of a conventional electrical circuit, as mentioned for the LED tube 1 of Fig. 1.1.
  • the current 9 will flow through a service man who comes into contact with end terminals bl, b2, if the service man is in contact with, for example, the earth potential (PE) .
  • PE earth potential
  • Fig. 3 it is shown how the electrical circuit of a conventional LED tube 1 may be modified according to the invention with a safety circuit 10, which eliminates the risk of electric shock to a user or service man, as described above .
  • the safety circuit 10 comprises a circuit breaker or switch 12, which is inserted in series with the LED module 7, where the switch 12 is controlled by a circuit 11 which is connected to the end terminals al, a2 such that the switch 12 is only closed when there is an operating voltage across the terminals al, a2.
  • a current can only flow through the LED module 7 when the LED tube 1 is properly placed in a fluorescent tube luminaire such that both end terminals al, a2 and bl, b2 are inserted in the fluorescent tube luminaire.
  • Fig. 3 is shown a preferred embodiment of the circuit 11 in form of a diode bridge.
  • Fig. 4 shows how the electric current 13 flows through the fluorescent tube luminaire and the LED tube 1 when the LED tube 1 is modified with a safety circuit 10.
  • Fig. 4.1 is shown how the electric current 13 flows in the circuit of the modified internal LED tube 1, where the circuit is provided with a safety circuit 10 comprising a switch 12 and a diode bridge 11 when the LED tube 1 is properly placed in a fluorescent tube luminaire as shown in Fig. 4.
  • a safety circuit 10 comprising a switch 12 and a diode bridge 11 when the LED tube 1 is properly placed in a fluorescent tube luminaire as shown in Fig. 4.
  • Fig. 5 shows an LED tube 1 with a modified safety circuit 10 where the LED tube 1 has only the one set of end terminals al,lie a2 placed in a fluorescent tube luminaire where the electric current that can flow through the LED tube 1 is indicated at 14.
  • Fig. 5.1 shows how the electric current 14 will flow in the LED tube 1 which is provided with a safety circuit 10 comprising a switch 12 and a diode bridge 11, and where the LED tube 1 is placed with only one pair of end terminals al, a2 placed in a fluorescent tube luminaire as indicated in Fig. 5. Since an operating voltage across the terminals al, a2 is not applied, in a configuration as indicated in Fig. 5, the switch 12 remains disconnected, and therefore the electric current 14 cannot flow through the LED module 7 and therefore cannot pass the end terminals bl, b2 either.
  • an LED tube 1 which is modified with a safety circuit 10
  • a user or service man does not run the risk of electric shock when touching the free end terminals bl, b2 where only a pair of end terminals al, a2 are placed in a fluorescent tube luminaire.
  • An LED tube, which is modified with a safety circuit 10 in accordance with the invention will work regardless of how the LED tube 1 is turned with respect to a fluorescent tube luminaire, which is illustrated in Fig. 6.
  • Fig. 6 is thus shown a situation with an LED tube 1 modified with a safety circuit 10 which is turned 180 degrees from the situation shown in Fig. 5.
  • Fig. 6.1 shows how the electrical current 15- will flow through the internal circuit of the LED tube 1.
  • the safety circuit 10 can be modified as shown in Fig. 7.
  • a switch 17 is inserted in series with the existing switch 12 to disconnect the current through the Starter.
  • a switch 16 can then be added, which is placed parallelly over the switch 12 to ensure that the LED module 7 is kept on when the Starter is disconnected by switch 17.
  • the switches 16 and 17 are controlled by the LED module 7, so that they are active when the LED module 7 is turned on.
  • LED tube 1 with a modified safety circuit 10 can therefore simply and safely be used to substitute all the existing fluorescent tubes.

Abstract

The invention comprises an LED tube (1) for lighting with electrical terminals a1, a2 in a tube end and electrical terminals b1, b2 in the opposite tube end, where the LED tube (1) between the a1, a2 and b1, b2 terminals are provided with electronic circuits such as in the form of a number, preferably two diode bridges (6,8) and an LED module (7) comprising a number of light emitting diodes, and where the LED tube can be installed in a fluorescent tube luminaire with a Starter (2) and a Ballast (3), where the LED tube (1) is provided with a safety circuit (10), which only opens for electrical current between the electrical terminals a1, a2 and b1, b2 when the LED tube (1) is properly installed in a fluorescent tube luminaire. Further, the invention comprises the use of LED tubes (1) which are provided with a safety circuit (10) for substitution of fluorescent tubes. By means of the invention is achieved that the LED tube (1) can be installed in any existing fluorescent tube luminaire with no safety risk that the user or service man is exposed to electric shock from the free end terminals, when only one pair of end terminals are installed in a fluorescent tube luminaire.

Description

LED Tubes with Safety Circuit and Use
The invention relates to an LED-tube for light emission with electrical terminals al, a2 in one tube end and electrical terminals bl, b2 in the opposite tube end, where the LED tube between the al, a2 and bl, b2 terminals are provided with electronic circuits, such as in the form of a number, preferably two, diode bridges and an LED module that comprises a number of light-emitting diodes, and where the LED tube can be installed in a fluorescent tube luminaire with a Starter and a Ballast in which the LED tube is provided with a safety circuit that only switches on the electric current between the electrical terminals al, a2 and bl, b2 when the LED tube is properly installed in a fluorescent tube luminaire.
In addition, the invention relates to the use of LED tubes.
Gas-filled fluorescent tubes are designed so that they work no matter how they are directed in the luminaire. It is possible even to insert one end of the tube in the luminaire, with the power on, without applying a voltage at the other end of the tube, since the gas inside the tube is non-conductive before the tube is properly installed and started. To reduce energy consumption and to improve the quality of light, so-called LED tubes is produced that can be placed in fluorescent tube luminaires and thus substituere the fluorescent tubes. LED tubes is different from fluorescent tubes in that the LED tubes do not contain a gas, but rather a number of LEDs (Light Emitting Diode) and an electric circuit connected to the terminals at both ends of the tube to ensure compatibility with existing fluorescent tube luminaires. However, it has been found that there are some problems with the known LED tubes.
Since the circuit of a LED tube is connected at both ends of the tube to ensure compatibility with existing luminaires, there is a risk that by incorrect installation a current flows from the tube terminals of one installed end to the other end of the tube, if the voltage over the luminaire is applied. If an electrician or another operator touches the terminals of the available other end of the LED tube while touching earth on the luminaire or elsewhere, there is a risk of electric shock. EP 2381159 A2 (TEKNOWARE OY [FI] ) , Oct. 26, 2011 discloses an LED tube, where the LED tube can be installed in a fluorescent tube luminaire with a Starter and a Ballast, and the LED tube is provided with a safety circuit that only opens for the electrical current between the electrical terminals when the LED tube is properly installed in the fluorescent tube luminaire .
However, it is a disadvantage of the technique described in EP 2381159 A2 that the safety circuit uses relatively expensive components.
It is therefore an object of the invention to provide an LED tube without the above disadvantages. Objects of the invention are provided by an LED tube of the type indicated in the preamble of claim 1, where the LED tube is characterized in that the safety circuit comprises a diode bridge, which is operated by al, a2 terminals and which controls a switch that is placed in series with the LED module. In this way it is possible to assemble and disassemble LED tubes in existing fluorescent tube luminaires without the risk that the the installer is subjected to electric shocks, using a safety circuit manufactured by cheap standard components.
Other expedient embodiments of the method are indicated in claims 2 and 3.
As mentioned, the invention also relates to the use of LED tubes for substitution of fluorescent tubes.
This makes it possible to substitute fluorescent tubes with LED tubes reducing energy consumption and increasing light quality without exposing the service man to the risk of health-threatening electrical shock.
The invention will now be explained with reference to the drawings, in which: Fig. 1 shows a conventional LED tube that is placed in a fluorescent tube luminaire, which comprises a Starter and a Ballast.
Fig. 1.1 shows a schematic drawing of the electrical circuit which is embedded in the LED tube of Fig. 1
Fig. 2 shows a conventional LED tube, where only the one set of end terminals are placed in the fluorescent tube luminaire, and where a current may flow through the tube to the free end terminals, with the risk that the service man is exposed to an electrical shock.
Fig. 2.1 shows a schematic drawing of the electrical circuit which is embedded in the LED tube of Fig. 2, indicating the current that can flow through the LED tube. Fig. 3 shows a schematic drawing of a safety circuit for an LED tube made in accordance with the invention.
Fig. 4 shows an LED tube made in accordance with the invention which is placed in a fluorescent tube luminaire, which comprises a Starter and a Ballast.
Fig. 4.1 shows a schematic drawing of the electrical circuit which is embedded in the LED tube of Fig. 4, indicating the current flowing in the circuit.
Fig. 5 shows an LED tube made in accordance with the invention wherein only the one set of end terminals are placed in the fluorescent tube luminaire but where a current cannot flow through the tube to the free end terminals.
Fig. 5.1 shows a schematic drawing of the electrical circuit which is embedded in the LED tube of Fig. 5 indicating the current flowing in the circuit.
Fig. 6 shows an LED tube made in accordance with the invention with switches for disconnecting the flow through the Starter and with circuit for compensating the energy supply to the LEDs.
Fig. 7 shows a safety circuit disengaging the Starter after startup .
In Fig. 1, an LED tube is designated with the numeral 1 that internally is traditionally structured as shown in the schematic diagram Fig. 1.1.
The LED tube 1 is placed in a fluorescent tube luminaire, comprising a so-called starter which in the location of the LED tube 1 shown in Fig. 1 is placed between terminals al and bl of the LED tube 1. The fluorescent tube luminaire is further provided with a so- called ballast, which is placed between the L terminal of the lighting mains and a terminal a2 of the LED tube 1.
A terminal b2 of the LED tube 1 is in the location of the LED tube 1 shown in Fig. 1 connected to the N (Neutral) terminal of the lighting mains. The fluorescent tube luminaire 1 as shown in Fig. 1 can be shielded by connection to earth (PE) .
The electric current flowing in the circuit as shown in Fig. 1 in normal operation, is indicated at 5.
Fig. 1.1 shows a schematic diagram of the electrical circuit, which is enclosed in the internal structure of the LED tube 1.
As will be apparent from Fig. 1.1, the end terminals al, a2 of the LED tube 1 are connected to a diode bridge 6, which output terminals are connected to a LED module 7, which comprises the light-emitting diodes that give light when the LED tube 1 is activated. Moreover, the output terminals of the diode bridge. 6 are connected to a diode bridge 8, which other two terminals are connected to the terminals bl, b2 of the two LED tubes 1.
In Fig. 1.1 the electric current through the LED tube 1 is indicated at 5.
Fig. 2 shows an LED tube 1, which is only installed at the one end to the terminals al, a2, such that the terminals bl, b2 are free and can be touched by a user or service man. The situation as shown in Fig. 2 can occur during installation or removal of an LED tube 1 in or from a fluorescent tube luminaire . If the fluorescent tube luminaire, which is in the situation shown in Fig. 2, is connected to the lighting mains, an electric current 9 will flow through the LED tube 1 in case of a conventional electrical circuit, as mentioned for the LED tube 1 of Fig. 1.1.
The current 9 will flow through a service man who comes into contact with end terminals bl, b2, if the service man is in contact with, for example, the earth potential (PE) . Such a shock can at worst be life threatening.
In Fig. 3 it is shown how the electrical circuit of a conventional LED tube 1 may be modified according to the invention with a safety circuit 10, which eliminates the risk of electric shock to a user or service man, as described above .
The safety circuit 10 comprises a circuit breaker or switch 12, which is inserted in series with the LED module 7, where the switch 12 is controlled by a circuit 11 which is connected to the end terminals al, a2 such that the switch 12 is only closed when there is an operating voltage across the terminals al, a2. This ensures that a current can only flow through the LED module 7 when the LED tube 1 is properly placed in a fluorescent tube luminaire such that both end terminals al, a2 and bl, b2 are inserted in the fluorescent tube luminaire. In Fig. 3 is shown a preferred embodiment of the circuit 11 in form of a diode bridge. Fig. 4 shows how the electric current 13 flows through the fluorescent tube luminaire and the LED tube 1 when the LED tube 1 is modified with a safety circuit 10.
In Fig. 4.1 is shown how the electric current 13 flows in the circuit of the modified internal LED tube 1, where the circuit is provided with a safety circuit 10 comprising a switch 12 and a diode bridge 11 when the LED tube 1 is properly placed in a fluorescent tube luminaire as shown in Fig. 4.
Fig. 5 shows an LED tube 1 with a modified safety circuit 10 where the LED tube 1 has only the one set of end terminals al,„ a2 placed in a fluorescent tube luminaire where the electric current that can flow through the LED tube 1 is indicated at 14.
Fig. 5.1 shows how the electric current 14 will flow in the LED tube 1 which is provided with a safety circuit 10 comprising a switch 12 and a diode bridge 11, and where the LED tube 1 is placed with only one pair of end terminals al, a2 placed in a fluorescent tube luminaire as indicated in Fig. 5. Since an operating voltage across the terminals al, a2 is not applied, in a configuration as indicated in Fig. 5, the switch 12 remains disconnected, and therefore the electric current 14 cannot flow through the LED module 7 and therefore cannot pass the end terminals bl, b2 either.
With an LED tube 1, which is modified with a safety circuit 10, a user or service man does not run the risk of electric shock when touching the free end terminals bl, b2 where only a pair of end terminals al, a2 are placed in a fluorescent tube luminaire. An LED tube, which is modified with a safety circuit 10 in accordance with the invention will work regardless of how the LED tube 1 is turned with respect to a fluorescent tube luminaire, which is illustrated in Fig. 6.
In the Fig. 6 is thus shown a situation with an LED tube 1 modified with a safety circuit 10 which is turned 180 degrees from the situation shown in Fig. 5. Fig. 6.1 shows how the electrical current 15- will flow through the internal circuit of the LED tube 1.
Since in the situation depicted in Fig. 5 and Fig. 5.1 there is is no operating voltage between the terminals al and a2, the switch 12 will remain disconnected and electrical current 15 cannot flow across the LED tube 1.
To avoid that there is a permanent current through the Starter after startup, the safety circuit 10 can be modified as shown in Fig. 7. A switch 17 is inserted in series with the existing switch 12 to disconnect the current through the Starter. A switch 16 can then be added, which is placed parallelly over the switch 12 to ensure that the LED module 7 is kept on when the Starter is disconnected by switch 17. The switches 16 and 17 are controlled by the LED module 7, so that they are active when the LED module 7 is turned on.
It should be emphasized that an LED tube 1 modified with a safety circuit 10 will operate in existing fluorescent tube luminaires, without any changes to these.
LED tube 1 with a modified safety circuit 10 can therefore simply and safely be used to substitute all the existing fluorescent tubes.

Claims

Claims An LED tube (1) for lighting with electrical terminals al, a2 in a tube end and electrical terminals bl, b2 in the opposite tube end, where the LED tube (1) between the al, a2 and bl, b2 terminals are provided with electronic circuits such as in the form of a number, preferably two, diode bridges (6,8), and where an LED module (7) comprising a number of light-emtting diodes, and where the LED tube can be installed in a fluorescent tube luminaire with a Starter (2) and a Ballast (3), where the LED tube (1) is provided with a safety circuit (10) , which only opens for electrical current between the electrical terminals al, a2 and bl, b2, when the LED tube
(1) is properly installed in a fluorescent tube luminaire characterized in that the safety circuit (10) comprises a diode bridge (11), operated by the terminals al, a2, and which controls a switch (12) which is placed in series with the LED module (7) .
An LED tube (1) according to claim 2 characterized in that a switch (17) is placed in series with the switch (12) for disconnecting the current through the Starter
(2) , where the switch (17) is controlled by the LED module ( 7 ) .
An LED tube (1) according to claim 3, characterized in that, a switch (16) is placed in parallel with the switch (12), where the switch (16) keeps the LED module (7) turned on when the Starter (2) is disconnected by the switch (17), where the switch (16) is controlled by the LED module (7) .
Use of LED tube (1) according to one or more of claims 1 to 3 for substitution of fluorescent tubes.
PCT/DK2013/000082 2012-12-03 2013-11-25 Led tubes with safety circuit and use WO2014086360A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201200762 2012-12-03
DKPA201200762A DK177611B1 (en) 2012-12-03 2012-12-03 LED pipes with safety circuits and use

Publications (1)

Publication Number Publication Date
WO2014086360A1 true WO2014086360A1 (en) 2014-06-12

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Application Number Title Priority Date Filing Date
PCT/DK2013/000082 WO2014086360A1 (en) 2012-12-03 2013-11-25 Led tubes with safety circuit and use

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DK (1) DK177611B1 (en)
WO (1) WO2014086360A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011014111A1 (en) * 2009-07-29 2011-02-03 Td Light Sweden Ab Lighting system
EP2381158A2 (en) * 2010-04-23 2011-10-26 Teknoware Oy LED tube and lamp arrangement
EP2482618A2 (en) * 2011-01-31 2012-08-01 Teknoware Oy LED tubular lamp and lighting fixture arrangement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011014111A1 (en) * 2009-07-29 2011-02-03 Td Light Sweden Ab Lighting system
EP2381158A2 (en) * 2010-04-23 2011-10-26 Teknoware Oy LED tube and lamp arrangement
EP2482618A2 (en) * 2011-01-31 2012-08-01 Teknoware Oy LED tubular lamp and lighting fixture arrangement

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