Flexible high-power LED lighting system

• US 7,210,957 B2
• Filed: 10/19/2005
• Issued: 05/01/2007
• Est. Priority Date: 04/06/2004
• Status: Active Grant

• Current Assignee: Current Lighting Solutions, LLC (f/k/a GE Lighting Solutions, LLC) (American Industrial Partners)
• Original Assignee: Lumination LLC
• Inventors: Mrakovich, Matthew, Nall, Jeffrey
• Primary Examiner(s): Gilman; Alexander
• Application Number:
  US11/254,184
• Publication Number:
  US 20060035511A1
• Time in Patent Office: 559 Days
• Field of Search: 439/404, 439/403, 362/294, 362/559, 362/373, 362/545, 362/549, 257/E33.07, 257/6
• US Class Current: 439/404
• CPC Class Codes: F21S 4/10 with light sources attached to loose electric cables, e.g. Christmas tree lights
• CPC Class Codes: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 17/164 the parts being subjected to bending, e.g. snap joints
• CPC Class Codes: F21V 21/002 making direct electrical contact, e.g. by piercing F21V21/35 takes precedence
• CPC Class Codes: F21V 21/35 with direct electrical contact between the supporting element and electric conductors running along the guiding element
• CPC Class Codes: F21V 29/71 using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
• CPC Class Codes: F21V 29/713 in direct thermal and mechanical contact of each other to form a single system
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 31/04 Provision of filling media
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: H01R 12/675 with contacts having at least a slotted plate for penetration of cable insulation, e.g. insulation displacement contacts for round conductor flat cables
• CPC Class Codes: H01R 13/7175 Light emitting diodes (LEDs)
• CPC Class Codes: H01R 25/142 Their counterparts
• CPC Class Codes: H01R 25/147 Low voltage devices, i.e. safe to touch live conductors
• CPC Class Codes: H01R 4/2416 the contact members having insulation-cutting edges, e.g. of tuning fork type
• CPC Class Codes: H01R 4/2433 one part of the base being movable to push the cable into the slot

Abstract

A string light engine includes a flexible power cord, a heat sink, an IDC terminal, a PCB, and an LED. The flexible power cord includes an electrical wire and an insulating material for the wire. The heat sink attaches to the power cord. The IDC terminal is inserted through the insulating material and electrically communicates with the wire. The PCB is at least partially received in the heat sink. The PCB includes a first surface having circuitry and a second surface opposite the first surface. The circuitry is in electrical communication with the IDC terminal. The second surface is abutted against a surface of the heat sink so that heat is transferred from the LED into the heat sink. The LED mounts to the first surface of the PCB and is in electrical communication with the circuitry.

Claims

1. A string light engine comprising:

a flexible power cord comprising an electrical wire and an insulating material for the wire;

a heat sink attached to the power cord;

an IDC terminal inserted through the insulating material and in electrical communication with the wire;

a PCB at least partially received in the heat sink, the PCB including a first surface having circuitry and a second surface opposite the first surface, the circuitry being in electrical communication with the IDC terminal, the second surface being abutted against a surface of the heat sink so that heat is transferred from the LED into the heat sink;

an LED mounted to the first surface of the PCB and in electrical communication with the circuitry; and

a male terminal extending from the first surface of the PCB and in electrical communication with the circuitry of the PCB, and the IDC terminal includes a portion that receives the male terminal to mechanically fasten the IDC terminal to the PCB and to provide for electrical communication between the circuitry of the PCB and the wire.

2. The light engine of claim 1, further comprising a thermally conductive potting material disposed over at least a portion of the PCB for potting the PCB inside the heat sink.

3. The light engine of claim 1, further comprising a thermal film interposed between the second surface of the PCB and the heat sink.

4. The light engine of claim 1, further comprising a reflective surface extending upwardly from the heat sink and at least partially surrounding the LED.

5. A method of manufacturing a string light engine, the method comprising:

inserting an IDC terminal into a flexible power cord;

mechanically attaching the IDC terminal to an electrical connector disposed on a first surface of a PCB, wherein the electrical connector comprises at least one of an electrical receptacle and a male terminal and the IDC terminal provides electrical communication between the flexible power cord and an LED mounted on the first surface of the PCB;

inserting the PCB into a heat sink to provide a thermal path for heat to dissipate from the LED into the heat sink.

6. The method of claim 5, wherein the inserting the PCB into the heat sink step comprises inserting the PCB such that a portion of the heat sink extends over the first surface of the PCB.

7. The method of claim 6, further comprising inserting material between the first surface of the PCB and the heat sink to provide a thermal path.

8. The method of claim 7, wherein the inserting material step comprises disposing potting material between the first surface of the PCB and the heat sink.

9. A string light engine comprising:

a flexible power cord comprising a first wire, a second wire and insulating material for the wires; and

a plurality of LED modules attached to the power cord, each module comprising;

a thermally conductive PCB having circuitry printed on a first surface of the PCB;

an LED mounted to the first surface of the PCB and in electrical communication with the circuitry;

a heat conductive first housing portion receiving the PCB;

an electrically insulative second housing portion connected to the first housing portion, the second housing portion retaining the PCB against a surface of the first housing portion; and

an IDC terminal operatively connected to the PCB and inserted into the insulating material of the power cord such that the LED is in electrical communication with the first wire via the IDC terminal.

10. The light engine of claim 9, further comprising an IDC terminal holder connected to the heat sink, the IDC terminal holder comprising an electrically insulative material.

11. The light engine of claim 9, further comprising an electrically insulative member connected to the heat sink, the electrically insulative member sandwiching the IDC terminal to the power cord.

12. The light engine of claim 9, wherein the first wire and the second wire of the power cord generally reside in a plane and the power cord measures a distance d in the plane of the wires, and the heat sink measures a height h defined in a plane that is parallel to the plane of the wires, wherein 1<

hld<

1 .2.

13. The light engine of claim 9, further comprising a male terminal extending from the first surface of the PCB, wherein the IDC terminal mechanically connects to the male terminal.

14. The light engine of claim 9, where in first housing portion includes a substantially planar surface upon which the PCB rests and a mounting opening spaced from the substantially planar surface towards the flexible power cord such that when an associated fastener is received in the mounting opening the fastener does not extend through the planar surface.

15. The light engine of claim 14, further comprising a support post extending from the heat sink adjacent the opening, the support post being positioned to preclude the flexible power cord from contacting an associated fastener that is received in the mounting opening.

16. A string light engine comprising:

a flexible power cord comprising an electrical wire and an insulating material for the wire;

a heat sink attached to the power cord;

an IDC terminal inserted through the insulating material and in electrical communication with the wire;

a PCB at least partially received in the heat sink, the PCB including a first surface having circuitry and a second surface opposite the first surface, the circuitry being in electrical communication with the IDC terminal, the second surface being disposed adjacent a surface of the heat sink so that heat is transferred from the LED into the heat sink;

an LED mounted to the first surface of the PCB and in electrical communication with the circuitry; and

a thermally conductive potting material contacting at least a portion of the first surface of the PCB and at least a portion of the heat sink for potting the PCB inside the heat sink and providing a thermal path from the first surface of the PCB into the heat sink.

17. The light engine of claim 16, further comprising an electrically non-conductive PCB retainer connected to the heat sink, the PCB retainer including a resilient arm that compresses the second surface of the PCB against a generally planar surface of the heat sink.

18. The light engine of claim 16, wherein the heat sink includes a lower generally planar surface, and first and second posts each extending from the heat sink and terminating in a plane generally defined by the lower surface such that the support posts and the lower surface define three contact locations for the heat sink to mount against an associated heat conductive planar member.

19. The light engine of claim 16, further comprising an electrical connector mounted on the PCB and in electrical communication with the circuitry of the PCB, and the IDC connector includes a portion that mechanically attaches to the electrical connector to provide electrical communication between the circuitry of the PCB and the wire.

20. The light engine of claim 16, wherein the heat sink includes an opening through which a portion of the LED extends.

21. The light engine of claim 20, wherein the opening comprises a semicircular notch.