US20070164683A1 - Unique lighting string rectification - Google Patents
Unique lighting string rectification Download PDFInfo
- Publication number
- US20070164683A1 US20070164683A1 US11/332,281 US33228106A US2007164683A1 US 20070164683 A1 US20070164683 A1 US 20070164683A1 US 33228106 A US33228106 A US 33228106A US 2007164683 A1 US2007164683 A1 US 2007164683A1
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- Prior art keywords
- series
- rectification
- light string
- led light
- string according
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- 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]
-
- 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 present invention relates to the field of decorative LED light strings and particularly an improved circuit to be used to connect LED light strings having one or more series connection.
- LEDs are becoming increasingly popular as a light source in decorative and Christmas lights due to their reliability, energy savings, longevity, and cool operation.
- Manufacturers of decorative light strings are constantly working to maximize the brightness and benefits of LEDs as a light source as well as reduce production cost to narrow the gap between traditional, incandescent and LED light string cost.
- FIG. 1 shows a prior art embodiment of an LED light string comprising a light string requiring 4 conductor wires when a single series block of LED lamps and an end connector is employed. Five (5) conductor wires are required when two or more series blocks of LED lamps are employed. Both the AC to DC converter and additional wires imposed by this design add significant cost and detract from the aesthetics of the light string.
- FIGS. 2A and 2B also show prior art embodiments of LED light strings.
- the prominent feature of these prior arts is circuit rectification wherein the rectifying diodes are installed in split pairs in an attempt to save wire, thus reducing cost.
- three (3) conductor wires and a “dummy plug” is required when the light string does not have an end connector.
- significant modifications, enlarging the plug and/or end connector would be required in order to house the split pairs of rectifying diodes and voltage reducing devices.
- the split diode pairs and voltage reducing devices would require a fairly large, separate enclosure to house them. Both of these options add significant cost and detract from the aesthetics of the light string.
- the number of conductor wires required in the manufacture of the light chain increases one-for-one with each parallel connected series block of LEDs added to the lighting chain.
- a light string employing 2 series blocks of LED lamps requires 4 conductor wires (3 series blocks require 5 conductor wires, etc.).
- An even larger enclosure is required in order to house the diode pairs, multiple conductor wires, and voltage reducing devices;
- the invention disclosed defeats the wire saving purpose, adds cost, places severe limitations on the design, complicates the manufacturing process, and further detracts from the aesthetics of the light string.
- both of the light string designs shown in FIG. 1 and FIGS. 2A and 2B create a safety hazard when additional series blocks of LED lamps are employed.
- the AC to DC converter rectifying diodes
- the AC to DC converter will quickly overheat due to the increased electrical load (current summation) imposed by the additional parallel connected series blocks of LED lamps. Accordingly, both of these designs have severe limitations.
- the object of the present invention is to provide an improved decorative light string circuit that can solve the problems mentioned previously.
- the present invention comprises a common decorative light string current tap or plug, a common end connector, full bridge rectification consisting of 4 rectifying diodes and at least 1 block of series connected LED lamps.
- Individual rectifying diodes form electrical connections between parallel and series conductors at various points within the light string.
- Said individual rectifying diodes can be distributed and housed among the light string plug, end connector, decorative light string lamp husks, or attached directly to the LED electrical contacts or conductor wires (or any combination thereof), simplifying the manufacturing process and rendering them invisible and thus eliminating the manufacture, enclosing, and electrically insulating of the 4 diode set and multiple conductor connections required of prior art FIG. 1 , and the split pairs of rectifying diodes and/or current and voltage control devices and multiple conductor connections required of prior art FIG. 2A and 2B .
- Additional LED series sets can be added in parallel to the first using traditional series/parallel light string construction and assembly methods. This eliminates the rectifying diode current summation load restrictions imposed by prior art and associated safety hazard due to diode overheating and further simplifies the light string manufacturing process.
- each bridge and LED series circuit is electrically independent parallel connected series blocks of LEDs can have varying number of serially connected LEDs within the same light string.
- series block # 1 could have 75 LED lamps in series with parallel connected series block # 2 having only 25 LED lamps in series and parallel connected series block # 3 having 50 LED lamps in series.
- Manufacturing cost is significantly reduced and light string appearance improved as the number of conductor wires does not increase as the number of LED series blocks connected in parallel increases.
- the prior art shown in FIG. 1 requires 5 conductor wires when multiple series blocks of LED lamps are connected in parallel.
- Prior art shown in FIG. 2B requires 1 additional conductor wire for each parallel connected series block of LED lamps.
- the present invention requires only 3 conductor wires regardless of the number of parallel connections employed.
- FIG. 1 is a prior art schematic circuit diagram of a decorative light string.
- FIGS. 2A and 2B are prior art schematic circuit diagrams of decorative light strings.
- FIG. 3A and 3B is schematic circuit diagrams of this invention
- FIGS. 4A-4C illustrates a physical embodiment of the circuit diagram shown in FIG. 3A and 3B .
- the LED light string includes a common household AC input voltage source and AC plug ( 101 ), parallel conductor wires ( 103 and 105 ), series conductor wire ( 104 ), a plurality of LED lamps, and end connector plug ( 102 ) incorporating exit AC voltage for powering additional light strings.
- First rectifying diode ( 110 ) forms an electrical connection between parallel conductor wire ( 103 ) via optional resistor ( 120 ) and the positive terminal of first light emitting diode ( 130 ). Subsequent light emitting diodes are electrically connected in series via series conductor wire ( 104 ) through last series connected light emitting diode ( 133 ). Second rectifying diode ( 111 ) forms an electrical connection between the negative terminal of last light emitting diode ( 133 ) and parallel conductor wire ( 103 ) via optional resistor ( 120 ), thus giving half wave rectification to the partially completed circuit.
- Third rectifying diode ( 112 ) forms an electrical connection between parallel conductor wire ( 105 ) via optional resistor ( 120 ) and the negative terminal of second series connected light emitting diode ( 131 ).
- Fourth rectifying diode ( 113 ) forms an electrical connection between the negative terminal of next to last series connected light emitting diode ( 132 ) and parallel conductor wire ( 105 ) via optional resistor ( 120 ), thus completing the circuit and providing full bridge rectification.
- Optional series resistors ( 121 ) can be added in order to drive the serially connected LED lamps at the desired current.
- a varistor, capacitor, current saturated transistor, current limiting diode (CLD) or other impedance device can be substituted for one or more of resistors ( 120 and 121 ).
- additional series blocks of LED lamps can be connected in parallel with each additional series block operating electrically independent of prior and subsequent series blocks of LED lamps.
- FIGS. 4A-4C A physical embodiment of the circuit diagram shown in FIG. 3A and 3B is illustrated in FIGS. 4A-4C with main components numbered accordingly.
- FIG. 4A illustrates rectifying diodes ( 110 , 111 , 112 , and 113 ) connected directly to parallel conductor wires ( 103 and 105 ) respectively.
- FIG. 4B illustrates one each of the rectifying diodes contained inside the conventional AC plug and end connector and one each of the rectifying diodes connected directly to the respective LED lamp and contained inside the conventional, plastic light string lamp husk. Alternately, all four rectifying diodes can be housed within the plug and cord connected and connected to the respective LED lamps in the manner shown.
- FIG. 4C illustrates one each of the rectifying diodes connected directly to the respective LED lamp and contained inside the conventional, plastic light string husk.
Abstract
Description
- The present invention relates to the field of decorative LED light strings and particularly an improved circuit to be used to connect LED light strings having one or more series connection.
- LEDs are becoming increasingly popular as a light source in decorative and Christmas lights due to their reliability, energy savings, longevity, and cool operation. Manufacturers of decorative light strings are constantly working to maximize the brightness and benefits of LEDs as a light source as well as reduce production cost to narrow the gap between traditional, incandescent and LED light string cost.
- It is known in the art the use of a DC power supply to power LED lamps maximize LED brightness and longevity. However, prior art discloses the use of a full bridge rectification circuit that requires additional conductor wires, separate enclosures to house rectifying diodes and/or additional conductor connections and/or voltage and current reducing devices, and places undue current load on rectifying diodes, detracting from the appearance of the light string and creating a potential safety hazard.
-
FIG. 1 shows a prior art embodiment of an LED light string comprising a light string requiring 4 conductor wires when a single series block of LED lamps and an end connector is employed. Five (5) conductor wires are required when two or more series blocks of LED lamps are employed. Both the AC to DC converter and additional wires imposed by this design add significant cost and detract from the aesthetics of the light string. -
FIGS. 2A and 2B also show prior art embodiments of LED light strings. The prominent feature of these prior arts is circuit rectification wherein the rectifying diodes are installed in split pairs in an attempt to save wire, thus reducing cost. However according to the embodiment ofFIG. 2A of the invention, three (3) conductor wires and a “dummy plug” is required when the light string does not have an end connector. In addition, significant modifications, enlarging the plug and/or end connector would be required in order to house the split pairs of rectifying diodes and voltage reducing devices. Alternately, the split diode pairs and voltage reducing devices would require a fairly large, separate enclosure to house them. Both of these options add significant cost and detract from the aesthetics of the light string. - According to the embodiment of
FIG. 2B of this invention the number of conductor wires required in the manufacture of the light chain increases one-for-one with each parallel connected series block of LEDs added to the lighting chain. Thus, a light string employing 2 series blocks of LED lamps requires 4 conductor wires (3 series blocks require 5 conductor wires, etc.). An even larger enclosure is required in order to house the diode pairs, multiple conductor wires, and voltage reducing devices; Thus the invention disclosed defeats the wire saving purpose, adds cost, places severe limitations on the design, complicates the manufacturing process, and further detracts from the aesthetics of the light string. - In addition, both of the light string designs shown in
FIG. 1 andFIGS. 2A and 2B create a safety hazard when additional series blocks of LED lamps are employed. The AC to DC converter (rectifying diodes) will quickly overheat due to the increased electrical load (current summation) imposed by the additional parallel connected series blocks of LED lamps. Accordingly, both of these designs have severe limitations. - In view of the disadvantages of the prior art, the object of the present invention is to provide an improved decorative light string circuit that can solve the problems mentioned previously.
- To attain the aforesaid object, the present invention comprises a common decorative light string current tap or plug, a common end connector, full bridge rectification consisting of 4 rectifying diodes and at least 1 block of series connected LED lamps. Individual rectifying diodes form electrical connections between parallel and series conductors at various points within the light string. Said individual rectifying diodes can be distributed and housed among the light string plug, end connector, decorative light string lamp husks, or attached directly to the LED electrical contacts or conductor wires (or any combination thereof), simplifying the manufacturing process and rendering them invisible and thus eliminating the manufacture, enclosing, and electrically insulating of the 4 diode set and multiple conductor connections required of prior art
FIG. 1 , and the split pairs of rectifying diodes and/or current and voltage control devices and multiple conductor connections required of prior artFIG. 2A and 2B . - Additional LED series sets can be added in parallel to the first using traditional series/parallel light string construction and assembly methods. This eliminates the rectifying diode current summation load restrictions imposed by prior art and associated safety hazard due to diode overheating and further simplifies the light string manufacturing process.
- In addition, since each bridge and LED series circuit is electrically independent parallel connected series blocks of LEDs can have varying number of serially connected LEDs within the same light string. For example
series block # 1 could have 75 LED lamps in series with parallel connectedseries block # 2 having only 25 LED lamps in series and parallel connectedseries block # 3 having 50 LED lamps in series. - Manufacturing cost is significantly reduced and light string appearance improved as the number of conductor wires does not increase as the number of LED series blocks connected in parallel increases. The prior art shown in
FIG. 1 requires 5 conductor wires when multiple series blocks of LED lamps are connected in parallel. Prior art shown inFIG. 2B requires 1 additional conductor wire for each parallel connected series block of LED lamps. The present invention requires only 3 conductor wires regardless of the number of parallel connections employed. - This invention, as well as its advantages will become apparent to one of ordinary skill in the art upon review of the included description and figures.
-
FIG. 1 is a prior art schematic circuit diagram of a decorative light string. -
FIGS. 2A and 2B are prior art schematic circuit diagrams of decorative light strings. -
FIG. 3A and 3B is schematic circuit diagrams of this inventionFIGS. 4A-4C illustrates a physical embodiment of the circuit diagram shown inFIG. 3A and 3B . - Reference will now be made to the exemplary embodiments illustrated in the drawings, and specific language will be used herein to describe the same.
- As shown in
FIGS. 3A and 3B , the LED light string includes a common household AC input voltage source and AC plug (101), parallel conductor wires (103 and 105), series conductor wire (104), a plurality of LED lamps, and end connector plug (102) incorporating exit AC voltage for powering additional light strings. - First rectifying diode (110) forms an electrical connection between parallel conductor wire (103) via optional resistor (120) and the positive terminal of first light emitting diode (130). Subsequent light emitting diodes are electrically connected in series via series conductor wire (104) through last series connected light emitting diode (133). Second rectifying diode (111) forms an electrical connection between the negative terminal of last light emitting diode (133) and parallel conductor wire (103) via optional resistor (120), thus giving half wave rectification to the partially completed circuit.
- Third rectifying diode (112) forms an electrical connection between parallel conductor wire (105) via optional resistor (120) and the negative terminal of second series connected light emitting diode (131). Fourth rectifying diode (113) forms an electrical connection between the negative terminal of next to last series connected light emitting diode (132) and parallel conductor wire (105) via optional resistor (120), thus completing the circuit and providing full bridge rectification.
- Optional series resistors (121) can be added in order to drive the serially connected LED lamps at the desired current. A varistor, capacitor, current saturated transistor, current limiting diode (CLD) or other impedance device can be substituted for one or more of resistors (120 and 121).
- As shown in
FIG. 3B , additional series blocks of LED lamps can be connected in parallel with each additional series block operating electrically independent of prior and subsequent series blocks of LED lamps. - A physical embodiment of the circuit diagram shown in
FIG. 3A and 3B is illustrated inFIGS. 4A-4C with main components numbered accordingly. -
FIG. 4A illustrates rectifying diodes (110, 111, 112, and 113) connected directly to parallel conductor wires (103 and 105) respectively. -
FIG. 4B illustrates one each of the rectifying diodes contained inside the conventional AC plug and end connector and one each of the rectifying diodes connected directly to the respective LED lamp and contained inside the conventional, plastic light string lamp husk. Alternately, all four rectifying diodes can be housed within the plug and cord connected and connected to the respective LED lamps in the manner shown. -
FIG. 4C illustrates one each of the rectifying diodes connected directly to the respective LED lamp and contained inside the conventional, plastic light string husk. - These figures are not meant to be all inclusive and are provided to illustrate to light string manufacturers how all or partial individual rectifying diodes can be incorporated within or attached to standard, commonly used lighting string components without alteration or modification of the components, or requiring fabrication of additional enclosures, thus allowing manufacturers to follow the assembly process traditionally practiced by the decorative lighting industry.
- Naturally, the polarity of components and series connected LEDs can be reversed. Positive DC connections were illustrated first for consistency of illustration only.
- It is to be understood that the above-referenced arrangements are illustrative of the application of the principles of the present invention. It will be apparent to those of ordinary skill in the art that numerous modifications can be made without departing from the principles and concepts of the invention as set forth in the following claims:
Claims (14)
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US11/332,281 US7250730B1 (en) | 2006-01-17 | 2006-01-17 | Unique lighting string rectification |
CA2547865A CA2547865C (en) | 2006-01-17 | 2006-05-24 | Unique lighting string rectification |
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US11/332,281 US7250730B1 (en) | 2006-01-17 | 2006-01-17 | Unique lighting string rectification |
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US7250730B1 US7250730B1 (en) | 2007-07-31 |
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CA2547865A1 (en) | 2007-07-17 |
CA2547865C (en) | 2010-08-10 |
US7250730B1 (en) | 2007-07-31 |
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