GB2469810A - A fluorescent lamp with overheat protection function to cut-off power - Google Patents

A fluorescent lamp with overheat protection function to cut-off power Download PDF

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Publication number
GB2469810A
GB2469810A GB0907233A GB0907233A GB2469810A GB 2469810 A GB2469810 A GB 2469810A GB 0907233 A GB0907233 A GB 0907233A GB 0907233 A GB0907233 A GB 0907233A GB 2469810 A GB2469810 A GB 2469810A
Authority
GB
United Kingdom
Prior art keywords
control circuit
protection device
fluorescent lamp
base
electrically connected
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Withdrawn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
GB0907233A
Other versions
GB0907233D0 (en
Inventor
Wen-Hsin Chao
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.)
Kaoyi Electronic Co Ltd
Original Assignee
Kaoyi Electronic Co Ltd
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 Kaoyi Electronic Co Ltd filed Critical Kaoyi Electronic Co Ltd
Priority to GB0907233A priority Critical patent/GB2469810A/en
Publication of GB0907233D0 publication Critical patent/GB0907233D0/en
Publication of GB2469810A publication Critical patent/GB2469810A/en
Withdrawn legal-status Critical Current

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
    • F21V25/10—Safety devices structurally associated with lighting devices coming into action when lighting device is overloaded, e.g. thermal switch
    • 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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • 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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2856—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against internal abnormal circuit conditions
    • 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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2986—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against internal abnormal circuit conditions

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

A fluorescent lamp includes a base (20), a control circuit 31, 32 mounted in the base (20), and a fluorescent tube 10 and a protection device 40 both electrically connected with the control circuit 31, 32. When the control circuit temperature exceeds a preset value, the protection device 40 shuts down an electric power 23 to the control circuit 31, 32 and stops the fluorescent tube 10. This is designed to protect the control circuit 31, 32 from overheat and damage when there is an overheat of the tube 10. The protection device 40 may be a thermal or heat or temperature sensitive switch or fuse or resistor or sensor. The preset temperature may be in the range 115 to 130 C. The power supply 23 may be connected to the protection device 40, then to a rectifier 31, then to a power converter 32, and then to the tube 10, returning back to the power supply 24. The lamp may include a lamp shade 22.

Description

FLUORESCENT LAMP HAVING OVERHEAT PROTECTION FUNCTION
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lamp and, more particularly, to a fluorescent lamp tO provide a lighting function.
2. Description of the Related Art
A conventional fluorescent lamp comprises a base, a control circuit mounted in the base, a fluorescent tube electrically connected with the control circuit, and a lamp shade mounted on the base to cover the fluorescent tube.
The control circuit includes a rectifier and a power converter (or transformer).
When in use, when the fluorescent lamp is electrified, an electric current from an external power supply in turn flows through the input terminal of the base, the rectifier of the control circuit, the power converter of the control circuit, and the fluorescent tube and flows outwardly from the output terminal of the base. At this time, when the electric current flows through the rectifier of the control circuit, the electric current is rectified and filtered by the rectifier of the control circuit to produce a stabilized direct current. In addition, when the electric current flows through the power converter of the control circuit, the power converter of the control circuit transforms the electric current from an alternating current into a direct current. In addition, when the electric current flows through the fluorescent tube, the fluorescent tube produces an arc discharging action to provide a lighting function.
In such a manner, when the fluorescent tube is aged or worn out during a long-term utilization, the impedance in the fluorescent tube is increased largely to produce a greater heat energy so that the temperature of the fluorescent tube is increased largely, and the temperature of the control circuit is also increased largely. However, when the temperature of the control circuit is raised excessively, the control circuit will produce overheat, so that the rectifier and the power converter of the control circuit are easily worn out or broken due to an overheat.
BRIEF SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a fluorescent lamp, comprising a base, a control circuit mounted in the base, a fluorescent tube electrically connected with the control circuit, and a protection device electrically connected with the control circuit and operable to shut an electric power supplied to the control circuit when a temperature of the control circuit is raised to reach a preset temperature value so as to stop operation of the fluorescent tube.
The primary objective of the present invention is to provide a fluorescent lamp having an overheat protection function.
Another objective of the present invention is to provide a fluorescent lamp, wherein when the temperature of the control circuit is raised excessively to reach the preset temperature value due to an overheat of the fluorescent tube, the protection device is operated to interrupt the connection between the input terminal of the base and the control circuit and to shut the electric power supplied to the control circuit so as to stop operation of the fluorescent tube and to prevent the control circuit from producing overheat, thereby protecting and preventing the rectifier and the power converter of the control circuit from being worn out or broken due to an overheat.
A further objective of the present invention is to provide a fluorescent lamp, wherein the protection device can protect the control circuit to prevent the control circuit from being burned so as to protect the user's safety and to save the costs of maintenance.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S) Fig. 1 is an exploded perspective view of a fluorescent lamp in accordance with the preferred embodiment of the present invention.
Fig. 2 is a circuit layout of the fluorescent lamp as shown in Fig. 1.
Fig. 3 is a circuit block diagram of the fluorescent lamp as shown in Fig. 1.
Fig. 4 is a circuit block diagram of a fluorescent lamp in accordance with another preferred embodiment of the present invention.
Fig. 5 is a circuit block diagram of a fluorescent lamp in accordance with another preferred embodiment of the present invention.
DETAILED DESCRIPTION OF THE FNVENTION
Referring to the drawings and initially to Figs. 1-3, a fluorescent lamp in accordance with the preferred embodiment of the present invention comprises a base 20, a control circuit 30 mounted in the base 20, a fluorescent tube 10 electrically connected with the control circuit 30, and a protection device 40 electrically connected with the control circuit 30 and operable to shut an electric power supplied to the control circuit 30 when a temperature of the control circuit 30 is raised to reach a preset temperature value so as to stop operation of the fluorescent tube 10. The fluorescent lamp further comprises a lamp shade 22 mounted on the base 20 to cover the fluorescent tube 10.
The base 20 includes an input terminal 23 and an output terminal 24.
The protection device 40 is electrically connected between the input terminal 23 of the base 20 and the control circuit 30. The control circuit 30 is electrically connected between the protection evice 40 and the fluorescent tube 10. The fluorescent tube 10 is electrically connected between the control circuit 30 and the output terminal 24 of the base 20. The fluorescent tube 10 is mounted inside of the lamp shade 22. The control circuit 30 is mounted outside of the lamp shade 22 and is located between the lamp shade 22 and the base 20. The control circuit 30 has a connecting terminal 33 electrically connected with the fluorescent tube 10. The connecting terminal 33 of the control circuit 30 is mounted inside of the lamp shade 22. The control circuit 30 includes a rectifier 3 1 electrically connected with the protection device 40 and a power converter (or transformer) 32 electrically connected between the rectifier 31 and the fluorescent tube 10. The connecting terminal 33 of the control circuit 30 is electrically connected between the power converter 32 and the fluorescent tube 10.
The protection device 40 is mounted on the control circuit 30 and is located between the lamp shade 22 and the base 20. The protection device 40 is electrically connected between the input terminal 23 of the base 20 and the rectifier 31 of the control circuit 30. Preferably, the protection device 40 is a heat sensitive switch. The preset temperature value of the control circuit 30 is ranged between 115°C and 130°C. Thus, when the temperature of the control circuit 30 is raised to reach the preset temperature value ranged between 115°C and 130°C, the protection device 40 is operable to interrupt the connection between the input terminal 23 of the base 20 and the control circuit 30 and to shut the electric power supplied to the control circuit 30 so as to stop operation of the fluorescent tube 10.
When in use, when the fluorescent lamp is electrified, an electric current from an external power supply (not shown) in turn flows through the input terminal 23 of the base 20, the protection device 40, the rectifier 31 of the control circuit 30, the power converter 32 of the control circuit 30, the connecting terminal 33 of the control circuit 30 and the fluorescent tube 10 and flows outwardly from the output terminal 24 of the base 20. At this time, when the electric current flows through the rectifier 31 of the control circuit 30, the electric current is rectified and filtered by the rectifier 31 of the control circuit to produce a stabilized direct current. In addition, when the electric current flows through the power converter 32 of the control circuit 30, the power converter 32 of the control circuit 30 transforms the electric current from an alternating current into a direct current. In addition, when the electric current flows through the fluorescent tube 10, the fluorescent tube 10 produces an arc discharging action to provide a lighting function.
In such a manner, when the fluorescent tube 10 is aged or worn out during a long-term utilization, the impedance in the fluorescent tube 10 is increased largely to produce a greater heat energy so that the temperature of the fluorescent tube 10 is increased largely, and the temperature of the control circuit 30 is also increased largely. Thus, when the temperature of the control circuit 30 is raised excessively to reach the preset temperature value (ranged between 115°C and 130°C), the protection device 40 is operated to interrupt the connection between the input terminal 23 of the base 20 and the control circuit 30 and to shut the electric power supplied to the control circuit 30 so as to stop operation of the fluorescent tube 10 and to prevent the control circuit 30 from producing overheat, thereby protecting and preventing the rectifier 31 and the power converter 32 of the control circuit 30 from being worn out or broken due to an overheat.
As shown in Fig. 3, the protection device 40 is a heating fuse.
As shown in Fig. 4, the protection device 40a is a heat fused switch.
As shown in Fig. 5, the protection device 40b is a heat sensitive resistor.
Accordingly, when the temperature of the control circuit 30 is raised excessively to reach the preset temperature value due to an overheat of the fluorescent tube 10, the protection device 40 is operated to interrupt the connection between the input terminal 23 of the base 20 and the control circuit and to shut the electric power supplied to the control circuit 30 so as to stop operation of the fluorescent tube 10 and to prevent the control circuit 30 from producing overheat, thereby protecting and preventing the rectifier 31 and the power converter 32 of the control circuit 30 from being worn out or broken due to an overheat. In addition, the protection device 40 can protect the control circuit 30 to prevent the control circuit 30 from being burned so as to protect the user's safety and to save the costs of maintenance.
Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the true scope of the invention.

Claims (18)

  1. CLAIMS1. A fluorescent lamp, comprising: abase; a control circuit mounted in the base; a fluorescent tube electrically connected with the control circuit; a protection device electrically connected with the control circuit and operable to shut an electric power supplied to the control circuit when a temperature of the control circuit is raised to reach a preset temperature value so as to stop operation of the fluorescent tube.
  2. 2. The fluorescent lamp of claim 1, wherein the base includes an input terminal and an output terminal; the protection device is electrically connected between the input terminal of the base and the control circuit.
  3. 3. The fluorescent lamp of claim 2, wherein the control circuit is electrically connected between the protection device and the fluorescent tube.
  4. 4. The fluorescent lamp of claim 3, wherein the fluorescent tube is electrically connected between the control circuit and the output terminal of the base.
  5. 5. The fluorescent lamp of claim 3, wherein the control circuit includes: a rectifier electrically connected with the protection device;Sa power converter electrically connected between the rectifier and the fluorescent tube.
  6. 6. The fluorescent lamp of claim 5, wherein the protection device is electrically connected between the input terminal of the base and the rectifier of the control circuit.
  7. 7. The fluorescent lamp of claim 5, wherein the control circuit has a connecting terminal electrically connected with the fluorescent tube.
  8. 8. The fluorescent lamp of claim 7, wherein the connecting terminal of the control circuit is electrically connected between the power converter and the fluorescent tube.
  9. 9. The fluorescent lamp of claim 1, wherein the preset temperature value of the control circuit is ranged between 115°C and 130°C.
  10. 10. The fluorescent lamp of claim 1, wherein the protection device is mounted on the control circuit.
  11. 11. The fluorescent lamp of claim 1, wherein the protection device is a heat sensitive switch.
  12. 12. The fluorescent lamp of claim 11, wherein the protection device is a heating fuse.
  13. 13. The fluorescent lamp of claim 11, wherein the protection device is a heat fused switch.
  14. 14. The fluorescent lamp of claim 11, wherein the protection device is a heat sensitive resistor.
  15. 15. The fluorescent lamp of claim 5, wherein wher the temperature of the control circuit is raised to reach the preset temperature value, the protection device is operable to interrupt a connection between the input terminal of the base and the control circuit and to shut the electric power supplied to the control circuit so as to stop operation of the fluorescent tube and to prevent the control circuit from producing overheat, thereby protecting the rectifier and the power converter of the control circuit.
  16. 16. The fluorescent lamp of claim 7, further comprising: a lamp shade mounted on the base to cover the fluorescent tube.
  17. 17. The fluorescent lamp of claim 16, wherein the fluorescent tube is mounted inside of the lamp shade; the control circuit is mounted outside of the lamp shade and is located between the lamp shade and the base; the connecting terminal of the control circuit is mounted inside of the lamp shade; the protection device is located between the lamp shade and the base.
  18. 18. A fluorescent lamp substantially ashereinbefore described with reference to and as shown in the accompanying drawin s.Amendments to the Claims have been filed as followsCLAIMS1. A fluorescent lamp, comprising: a base which includes an input terminal and an output terminal; a control circuit mounted in the base; a fluorescent tube electrically connected with the control circuit; a protection device electrically connected between the input terminal of the base and the control circuit and operable to shut off the electric power supplied to the control circuit when a temperature of the control circuit is raised to reach a preset temperature value so as to stop operation of the fluorescent tube, wherein the control circuit is electrically connected between the protection device and the fluorescent tube, the fluorescent tube is electrically connected between the control circuit and the output terminal of the base, and the control circuit includes: * *.. 15 a rectifier electrically connected with the protection device; **** * a power converter electrically connected between the rectifier and the fluorescent tube, and *** wherein the protection device is electrically connected between the S...S S...input terminal of the base and the rectifier of the control circuit, the control S..... S *circuit has a connecting terminal electrically connected with the fluorescent tube, and the connecting terminal of the control circuit is electrically connected between the power converter and the fluorescent tube, and wherein the preset temperature value of the control circuit is within therangeoffrom 115°C and 130°C.2. The fluorescent lamp of claim 1, wherein the protection device is mounted on the control circuit.3. The fluorescent lamp of claim 1, wherein the protection device is a heat sensitive switch.4. The fluorescent lamp of claim 3, wherein the protection device is a heating fuse.5. The fluorescent lamp of claim 3, wherein the protection device is a heat fused switch.6. The fluorescent lamp of claim 3, wherein the protection device is a heat sensitive resistor.7. The fluorescent lamp of claim 1, wherein, when the temperature of the control circuit is raised to reach the preset temperature value, the protection 15 device is operated to interrupt the connection between the input terminal of the * *.* base and the control circuit and to shut off the electric power supplied to the control circuit so as to stop operation of the fluorescent tube and to prevent the *** control circuit from producing overheating, thereby protecting the rectifier and **1� S...the power converter of the control circuit.S.....S S8. The fluorescent lamp of claim 1, further comprising: a lamp shade mounted on the base to cover the fluorescent tube.9. The fluorescent lamp of claim 8, wherein the fluorescent tube is mounted inside the lamp shade; the control circuit is mounted outside the lamp shade and is located between the lamp shade and the base; the connecting terminal of the control circuit is mounted inside the lamp shade; and the protection device is located between the lamp shade and the base.10. A fluorescent lamp substantially as hereinbefore described with reference to and as shown in the accompanying drawings. I... * *SS.,... * S * .* * * * S..S S.. * S... *.*S*..... * S
GB0907233A 2009-04-28 2009-04-28 A fluorescent lamp with overheat protection function to cut-off power Withdrawn GB2469810A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0907233A GB2469810A (en) 2009-04-28 2009-04-28 A fluorescent lamp with overheat protection function to cut-off power

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0907233A GB2469810A (en) 2009-04-28 2009-04-28 A fluorescent lamp with overheat protection function to cut-off power

Publications (2)

Publication Number Publication Date
GB0907233D0 GB0907233D0 (en) 2009-06-10
GB2469810A true GB2469810A (en) 2010-11-03

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GB0907233A Withdrawn GB2469810A (en) 2009-04-28 2009-04-28 A fluorescent lamp with overheat protection function to cut-off power

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277726A (en) * 1978-08-28 1981-07-07 Litton Systems, Inc. Solid-state ballast for rapid-start type fluorescent lamps
EP0954207A2 (en) * 1998-03-31 1999-11-03 Toshiba Lighting & Technology Corporation Self ballasted fluorescent lamp and lighting fixture
US20040100749A1 (en) * 2002-11-26 2004-05-27 Lentz Tracy L. System, apparatus, and method for controlling lamp operation when subject to thermal cycling
DE202004019272U1 (en) * 2004-12-13 2005-02-24 Phocos Ag Device for protecting compact fluorescent lamps against excessive temperature has e.g. temperature-dependent bimetallic switch with which supply to compact fluorescent lamp is interrupted
DE102005014857A1 (en) * 2004-03-30 2005-12-22 Stefan Ruppel Cold cathode fluorescent tube lamp for piece of furniture or display cabinet has tube of sinusoidal shape on circular backplate with switch and starter circuit and has circular transparent cover
EP1718133A1 (en) * 2005-04-18 2006-11-02 Marvell World Trade Ltd Improved control system for fluorescent light fixture
WO2007034412A2 (en) * 2005-09-26 2007-03-29 Koninklijke Philips Electronics, N.V. Magnetic ballast fault isolation system and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277726A (en) * 1978-08-28 1981-07-07 Litton Systems, Inc. Solid-state ballast for rapid-start type fluorescent lamps
EP0954207A2 (en) * 1998-03-31 1999-11-03 Toshiba Lighting & Technology Corporation Self ballasted fluorescent lamp and lighting fixture
US20040100749A1 (en) * 2002-11-26 2004-05-27 Lentz Tracy L. System, apparatus, and method for controlling lamp operation when subject to thermal cycling
DE102005014857A1 (en) * 2004-03-30 2005-12-22 Stefan Ruppel Cold cathode fluorescent tube lamp for piece of furniture or display cabinet has tube of sinusoidal shape on circular backplate with switch and starter circuit and has circular transparent cover
DE202004019272U1 (en) * 2004-12-13 2005-02-24 Phocos Ag Device for protecting compact fluorescent lamps against excessive temperature has e.g. temperature-dependent bimetallic switch with which supply to compact fluorescent lamp is interrupted
EP1718133A1 (en) * 2005-04-18 2006-11-02 Marvell World Trade Ltd Improved control system for fluorescent light fixture
WO2007034412A2 (en) * 2005-09-26 2007-03-29 Koninklijke Philips Electronics, N.V. Magnetic ballast fault isolation system and method

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Publication number Publication date
GB0907233D0 (en) 2009-06-10

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