EP1953448A1 - Improved led lighting string employing rectified and filtered device - Google Patents
Improved led lighting string employing rectified and filtered device Download PDFInfo
- Publication number
- EP1953448A1 EP1953448A1 EP07101718A EP07101718A EP1953448A1 EP 1953448 A1 EP1953448 A1 EP 1953448A1 EP 07101718 A EP07101718 A EP 07101718A EP 07101718 A EP07101718 A EP 07101718A EP 1953448 A1 EP1953448 A1 EP 1953448A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- led lighting
- lighting string
- led
- rectified
- source
- 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- Withdrawn
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S4/00—Lighting devices or systems using a string or strip of light sources
- F21S4/10—Lighting devices or systems using a string or strip of light sources with light sources attached to loose electric cables, e.g. Christmas tree lights
-
- 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
- H05B45/345—Current stabilisation; Maintaining constant current
-
- 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
- H05B45/355—Power factor correction [PFC]; Reactive power compensation
-
- 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
- F21Y2101/00—Point-like light sources
Definitions
- the present invention relates to an improved LED lighting string employing a rectified and filtered device to rectify input AC source into DC source, and more particularly to an improved LED lighting string capable of improving LED's flickering issue and optimizing the optical power factor in LED lighting string.
- a current LED lighting string 10 decorated on a Christmas tree or on windows for celebration during the Christmas day or festival every year comprises an electrical wire 11 integrating with a plug 12 to get an AC source and one or more loops of LED lighting string 15 with a predetermined number of LED lamps 15a for lighting with single or multiple colors.
- the LED lamps when to apply the AC power source fails to emit lighting during the positive half-wave and negative half-wave simultaneously. Thus, this flaw may cause LED lamp can only work during half-wave, eventually resulting in massive loss to power factor.
- the current LED lighting string 10 shown in Figs 1 and 2 obviously exists with the flickering problem, which was mainly caused by the electrical frequency of 60Hz or 50Hz workable during either positive or negative half-wave of AC input source.
- the flickering problem existed in the current LED lighting string 10 will cause consumer with uncomfortable feeling in visual perception during the application.
- the primary objective of this present invention is to provide an improved LED lighting string employing an electric circuit program integrating with a rectified and filtered device to rectify input AC source into DC source providing to the LED lighting string, with this rectified and filtered device the LED lighting string may improve LED's flickering issue to generate "flicker free LED" in the LED lighting string and may upgrade the optical power factor and efficiency, and luminous intensity in LED lighting string.
- the main feature of the improved LED lighting string of the present invention comprises an electrical wire integrating with a plug to get an AC source and one or more loops of LED lighting strings in parallel circuit each loops having a predetermined number of LED lamps for lighting with single or multiple colors, wherein each loops or at least one loop of LED lighting strings has a rectified and filtered device coupled to the plug to rectify input AC source into DC source providing to the loop of LED lighting string having one corresponding rectified and filtered device.
- each loops or at least one loop of LED lighting strings further has one or more safe LED bulbs as a current-limiting device in series circuit to stabilize the corresponding loop applied in the improved LED lighting string of the present invention.
- At least one loop of LED lighting strings has an end connector used as a device connecting the other strings and a rectified and filtered device coupled to the end connector.
- the first embodiment of an improved LED lighting string 20 of the present invention comprises an electrical wire 21 integrating with a plug 22 to get an AC source, one loop of LED lighting string 25 with a predetermined number of LED lamps 25a for lighting with single or multiple colors and a rectified and filtered device 30 coupled in between the plug 22 and the loop of LED lighting string 25 to rectify input AC source into DC source providing to the loop of LED lighting string 25.
- the electric circuit program applied to the rectified and filtered device 30 is shown as Fig. 4 , which integrates a diode D1, a resistor R1 and a capacitor C1 as a "low pass filter” device.
- Fig. 4 The electric circuit program applied to the rectified and filtered device 30 is shown as Fig. 4 , which integrates a diode D1, a resistor R1 and a capacitor C1 as a "low pass filter” device.
- the rectified and filtered device 30 has the function of rectifying an AC input source into a DC output source and providing the rectified and efficient DC source into the LED lighting string 25 of the present invention.
- the LED lighting string 25 of the improved LED lighting string 20 of the present invention may improve LED's flickering issue to generate "flicker free LED" in the LED lighting string 25 and may upgrade the optical power factor and efficiency, and luminous intensity in LED lighting string 25.
- FIG. 7 and 8 A second embodiment of the improved LED lighting string 20 of the present invention is shown as in Figs. 7 and 8 , which fundamental structure is identical to the first embodiment mentioned above but comprising more than one loops of LED lighting strings 25 in parallel circuit, wherein each loops or at least one loop of LED lighting strings 25 has a rectified and filtered device 30 coupled to the plug 22 to rectify input AC source into DC source providing to the loop of LED lighting string 25 having one corresponding rectified and filtered device 30.
- a third embodiment of the improved LED lighting string 20 of the present invention is shown as in Figs. 10 and 11 , which fundamental structure is identical to the first embodiment mentioned above but comprising more than one loops of LED lighting strings 25 in parallel circuit, wherein at least one loop of LED lighting strings 25 has an end connector 23 used as a device connecting the other loop of LED lighting string 25 and a rectified and filtered device 30 coupled in series circuit to the end connector 23 for providing a DC source.
- each loops or at least one loop of LED lighting strings 25 further has one or more safe LED bulbs 40 as a current-limiting device in series circuit to stabilize the corresponding loop of LED lighting strings 25 applied in the improved LED lighting string 20 of the present invention.
Abstract
An improved LED lighting string (25) employs a rectified and filtered device (30) functioned as a low pass filter device to rectify input AC source into DC source providing to the LED lighting string for improving LED's flickering issue and to upgrade the optical power factor and efficiency, and luminous intensity in LED lighting string.
Description
- The present invention relates to an improved LED lighting string employing a rectified and filtered device to rectify input AC source into DC source, and more particularly to an improved LED lighting string capable of improving LED's flickering issue and optimizing the optical power factor in LED lighting string.
- As shown in
Figs 1 and 2 , a currentLED lighting string 10 decorated on a Christmas tree or on windows for celebration during the Christmas day or festival every year comprises anelectrical wire 11 integrating with aplug 12 to get an AC source and one or more loops ofLED lighting string 15 with a predetermined number of LED lamps 15a for lighting with single or multiple colors. - It is known a traditional bulb is workable during the positive and negative half-wave when to input AC source into the traditional bulb. While since the LED's characteristic is different from the traditional bulb the LED lamp can work during either positive or negative half-wave only.
- Due to the LED having the characteristic of semiconductor, the LED lamps when to apply the AC power source fails to emit lighting during the positive half-wave and negative half-wave simultaneously. Thus, this flaw may cause LED lamp can only work during half-wave, eventually resulting in massive loss to power factor.
- In a word, the current
LED lighting string 10 shown inFigs 1 and 2 obviously exists with the flickering problem, which was mainly caused by the electrical frequency of 60Hz or 50Hz workable during either positive or negative half-wave of AC input source. The flickering problem existed in the currentLED lighting string 10 will cause consumer with uncomfortable feeling in visual perception during the application. - For solving the flicking problem of the current
LED lighting string 10 mentioned above, it needs to design an electrical circuit program to improve the current LED Lighting String in application. - The primary objective of this present invention is to provide an improved LED lighting string employing an electric circuit program integrating with a rectified and filtered device to rectify input AC source into DC source providing to the LED lighting string, with this rectified and filtered device the LED lighting string may improve LED's flickering issue to generate "flicker free LED" in the LED lighting string and may upgrade the optical power factor and efficiency, and luminous intensity in LED lighting string.
- The main feature of the improved LED lighting string of the present invention comprises an electrical wire integrating with a plug to get an AC source and one or more loops of LED lighting strings in parallel circuit each loops having a predetermined number of LED lamps for lighting with single or multiple colors, wherein each loops or at least one loop of LED lighting strings has a rectified and filtered device coupled to the plug to rectify input AC source into DC source providing to the loop of LED lighting string having one corresponding rectified and filtered device.
- Another feature of the improved LED lighting string of the present invention is that each loops or at least one loop of LED lighting strings further has one or more safe LED bulbs as a current-limiting device in series circuit to stabilize the corresponding loop applied in the improved LED lighting string of the present invention.
- Further another feature of the improved LED lighting string of the present invention is that at least one loop of LED lighting strings has an end connector used as a device connecting the other strings and a rectified and filtered device coupled to the end connector.
-
-
Fig. 1 is a schematic view for a current LED lighting string which employs AC source existing with the problem of flickering; -
Fig. 2 is an electric circuit diagram for the current LED lighting string showing inFig. 1 ; -
Fig. 3 is a perspective view for a LED lighting string of the present invention having a rectified and filtered device to rectify the input AC source into DC source to improve the problem of flickering; -
Fig. 4 is an electric circuit diagram for the rectified and filtered device showing inFig. 3 having the function of rectifying input AC source into DC source; -
Fig. 5 is a schematic view to the LED lighting string of the present invention with a rectified and filtered device showing inFig. 3 ; -
Fig. 6 is an electric circuit diagram for the LED lighting string of the present invention with a rectified and filtered device showing inFig. 3 ; -
Fig. 7 is a schematic view to show a second embodiment of LED lighting string of the present invention; -
Fig. 8 is an electric circuit diagram for the second embodiment of LED lighting string of the present invention showing inFig. 7 ; -
Fig. 9 is another electric circuit diagram for the second embodiment of LED lighting string of the present invention ofFig. 7 which has one or more safe LED bulbs to control LED lamps as a current-limiting device applied in the LED Lighting string; -
Fig. 10 is a schematic view to show a third embodiment of LED lighting string of the present invention; -
Fig. 11 is an electric circuit diagram for the third embodiment of LED lighting string of the present invention showing inFig. 10 ; -
Fig. 12 is another electric circuit diagram for the third embodiment of LED lighting string of the present invention ofFig. 10 which has one or more safe LED bulbs to control LED lamps as a current-limiting device applied in the LED Lighting string. - Referred to from
Fig. 3 to Fig. 6 , the first embodiment of an improvedLED lighting string 20 of the present invention comprises anelectrical wire 21 integrating with aplug 22 to get an AC source, one loop ofLED lighting string 25 with a predetermined number ofLED lamps 25a for lighting with single or multiple colors and a rectified and filtereddevice 30 coupled in between theplug 22 and the loop ofLED lighting string 25 to rectify input AC source into DC source providing to the loop ofLED lighting string 25. - The electric circuit program applied to the rectified and filtered
device 30 is shown asFig. 4 , which integrates a diode D1, a resistor R1 and a capacitor C1 as a "low pass filter" device. When AC is input to the rectified and filtereddevice 30, the input AC is processed through the diode D1 for rectification, and then gone through the resistor R1 and the capacitor C1 to rectify and filter input current with ripple and output DC. Thus the rectified and filtereddevice 30 has the function of rectifying an AC input source into a DC output source and providing the rectified and efficient DC source into theLED lighting string 25 of the present invention. - When inserting the
plug 22 of the improvedLED lighting string 20 of the present invention into an AC source, an input AC power is then supplied to the rectified and filtereddevice 30 of the improvedLED lighting string 20. After then, the workable function done from the rectified and filtereddevice 30 is further explained as follows: - 1. When AC input power is at positive half-wave, the diode D1 may work and let the current pass through diode D1 and the resistor R1 and charge to capacitor C1, the charged maximum value may be up to the peak value of Vp, wherein Vp = Vc;
- 2. When AC input value is less than the charged voltage in capacitor C1, the diode D1 may not work and the capacitor C1 may work to discharge electricity according to the time-factor RC via the load R of the
LED lighting string 25; - 3. The capacitor C1 continues to discharge electricity until when AC input value is larger than the discharged voltage in capacitor C1, at the time, the diode D1 may work, and the capacitor C1 may be charged up to Vp and continue to next circle as mentioned above;
- 4. Accordingly, the above cycles may keep each
LED lights 25a of theLED lighting string 25 workable all the time during the positive or negative half-wave of AC input power. - By employing this rectified and filtered
device 30, it is concluded that theLED lighting string 25 of the improvedLED lighting string 20 of the present invention may improve LED's flickering issue to generate "flicker free LED" in theLED lighting string 25 and may upgrade the optical power factor and efficiency, and luminous intensity inLED lighting string 25. - A second embodiment of the improved
LED lighting string 20 of the present invention is shown as inFigs. 7 and 8 , which fundamental structure is identical to the first embodiment mentioned above but comprising more than one loops ofLED lighting strings 25 in parallel circuit, wherein each loops or at least one loop ofLED lighting strings 25 has a rectified and filtereddevice 30 coupled to theplug 22 to rectify input AC source into DC source providing to the loop ofLED lighting string 25 having one corresponding rectified and filtereddevice 30. - A third embodiment of the improved
LED lighting string 20 of the present invention is shown as inFigs. 10 and 11 , which fundamental structure is identical to the first embodiment mentioned above but comprising more than one loops ofLED lighting strings 25 in parallel circuit, wherein at least one loop ofLED lighting strings 25 has anend connector 23 used as a device connecting the other loop ofLED lighting string 25 and a rectified and filtereddevice 30 coupled in series circuit to theend connector 23 for providing a DC source. - As shown in
Fig. 9 or12 , another feature for the first, the second or the third embodiment of the improvedLED lighting string 20 of the present invention is that to achieve current-limiting purpose each loops or at least one loop ofLED lighting strings 25 further has one or moresafe LED bulbs 40 as a current-limiting device in series circuit to stabilize the corresponding loop ofLED lighting strings 25 applied in the improvedLED lighting string 20 of the present invention. - The contents disclosed above relate to a preferred embodiment of the present invention. It is to be understood that all equivalent modifications, variations, improvement or changes that are easily made by skillful people in the trade and without departing from the spirit of the above contents and drawings should be included in the subject claim.
Claims (4)
- An improved LED lighting string for improving LED's flickering issue comprises an electrical wire integrating with a plug to get an AC source and one or more loops of LED lighting strings in parallel circuit each with a predetermined number of LED lamps for lighting with single or multiple colors, wherein each loops or at least one loops of LED lighting strings has a rectified and filtered device integrated a diode D1, a resistor R1 and a capacitor C1 as a low pass filter device and coupled to the plug to rectify input AC source into DC source providing to whose loop of LED lighting string has one corresponding rectified and filtered device.
- The improved LED lighting string as defined in claim 1, wherein each loops or at least one loop of LED lighting strings further has one or more safe LED bulbs as a current-limiting device.
- The improved LED lighting string as defined in claim 1, wherein at least one loop of LED lighting strings has an end connector used as a device connecting the other loop of LED lighting string and a rectified and filtered device coupled in series circuit to the end connector for providing a DC source.
- The improved LED lighting string as defined in claim 3, wherein each loops or at least one loop of LED lighting strings further has one or more safe LED bulbs as a current-limiting device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07101718A EP1953448A1 (en) | 2007-02-05 | 2007-02-05 | Improved led lighting string employing rectified and filtered device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07101718A EP1953448A1 (en) | 2007-02-05 | 2007-02-05 | Improved led lighting string employing rectified and filtered device |
Publications (1)
Publication Number | Publication Date |
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EP1953448A1 true EP1953448A1 (en) | 2008-08-06 |
Family
ID=38190876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP07101718A Withdrawn EP1953448A1 (en) | 2007-02-05 | 2007-02-05 | Improved led lighting string employing rectified and filtered device |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010080458A1 (en) * | 2008-12-19 | 2010-07-15 | 3M Innovative Properties Company | Led light assembly |
WO2011038100A1 (en) * | 2009-09-23 | 2011-03-31 | 3M Innovative Properties Company | Lighting assembly |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5661645A (en) * | 1996-06-27 | 1997-08-26 | Hochstein; Peter A. | Power supply for light emitting diode array |
WO2002023956A2 (en) * | 2000-09-15 | 2002-03-21 | Teledyne Lighting And Display Products, Inc. | Power supply for light emitting diodes |
US20020191393A1 (en) * | 2001-06-18 | 2002-12-19 | Excellence Opto, Inc. | Safe light emitting device |
US20040189555A1 (en) * | 2003-03-26 | 2004-09-30 | Capen Larry Stephen | Use of track lighting switching power supplies to efficiently drive LED arrays |
US20040201988A1 (en) * | 1999-02-12 | 2004-10-14 | Fiber Optic Designs, Inc. | LED light string and arrays with improved harmonics and optimized power utilization |
WO2005055671A1 (en) * | 2003-12-04 | 2005-06-16 | Nenova, Iskra Lubenova | Concentrated light energy saving led lamp |
GB2418080A (en) * | 2004-09-08 | 2006-03-15 | Jin Rong Chang | Driving circuit module for connecting to a Christmas light string |
-
2007
- 2007-02-05 EP EP07101718A patent/EP1953448A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5661645A (en) * | 1996-06-27 | 1997-08-26 | Hochstein; Peter A. | Power supply for light emitting diode array |
US20040201988A1 (en) * | 1999-02-12 | 2004-10-14 | Fiber Optic Designs, Inc. | LED light string and arrays with improved harmonics and optimized power utilization |
WO2002023956A2 (en) * | 2000-09-15 | 2002-03-21 | Teledyne Lighting And Display Products, Inc. | Power supply for light emitting diodes |
US20020191393A1 (en) * | 2001-06-18 | 2002-12-19 | Excellence Opto, Inc. | Safe light emitting device |
US20040189555A1 (en) * | 2003-03-26 | 2004-09-30 | Capen Larry Stephen | Use of track lighting switching power supplies to efficiently drive LED arrays |
WO2005055671A1 (en) * | 2003-12-04 | 2005-06-16 | Nenova, Iskra Lubenova | Concentrated light energy saving led lamp |
GB2418080A (en) * | 2004-09-08 | 2006-03-15 | Jin Rong Chang | Driving circuit module for connecting to a Christmas light string |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010080458A1 (en) * | 2008-12-19 | 2010-07-15 | 3M Innovative Properties Company | Led light assembly |
WO2011038100A1 (en) * | 2009-09-23 | 2011-03-31 | 3M Innovative Properties Company | Lighting assembly |
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