High power LED lighting assembly incorporated with a heat dissipation module with heat pipe

• US 20080253125A1
• Filed: 04/11/2007
• Published: 10/16/2008
• Est. Priority Date: 04/11/2007
• Status: Active Grant

• Current Assignee: Tamkang University
• Original Assignee: Tamkang University
• Inventors: Tsai, Meng-Chang, Kang, Shung-Wen, Chien, Kun-Cheng
• Granted Patent: US 7,581,856 B2
• Time in Patent Office: Days
• US Class Current: 362/294
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/777 the planes containing the fins or blades having directions perpendicular to 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 3/10 characterised by coatings
• CPC Class Codes: F21Y 2107/30 on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A high power light emitting diode (LED) lighting assembly incorporated with heat dissipation module is provided. The LED lighting assembly includes a heat exchange base, at least one LED array, at least one heat pipe and a heat dissipation module. The heat exchange base includes at least one LED configuration plan for mounting of the LED array and at least a hollow part for insertion of the heat pipe. The LED array is arranged at a predetermined projecting angle at the LED configuration plane. The heat pipe includes a heated section, a cooling section and a conducting section, and contains a working fluid therein. The heat exchange base is mounted to the heated section and the heat dissipation module is mounted to the cooling section. The thermal energy generated by the LEDs is conducted from the heat exchange base to the heated section of the heat pipe, whereby allowing the working fluid in the heat pipe to be heated and vaporized, and flows, from the conducting section to the cooling section for dissipation at the heat dissipation module.

Claims

1. A LED lighting assembly, comprising:

a heat exchange base, comprising at least one LED configuration plane and at least one central hollow part, the LED configuration plane thereof being located on an outer surface of the heat exchange base;

at least one LED array, comprising a plurality of LEDs, each LED being positioned on the LED configuration plane of the heat exchange base at a predetermined angle for projection;

at least one heat pipe, comprising a heated section, a cooling section and a conducting section which connects the heated section to the cooling section and containing a working fluid, in which the heated section is inserted into the central hollow part of the heat exchange base and the connecting channel extends from the heat exchange base; and

a heat dissipation module, being arranged at the cooling section of the heat pipe;

wherein when a thermal energy generated by the LED is conducted from the heat exchange base to the heated section of the heat pipe, the working fluid in the heat pipe is heated and flows from the conducting section to the cooling section and transmits heat to the heat dissipation module at the cooling section to dissipates the thermal energy.

2. The LED lighting assembly as claimed in claim 1, wherein the LED lighting assembly further comprises a lamp shade, which covers the heat pipe, the heat exchange base, the LED array and the heat dissipation module, the lamp shade having a plurality of heat dissipating vents located in the vicinity of the heat dissipation module to allow the heated air surrounding the heat dissipation module to dissipate by convection.

3. The LED lighting assembly as claimed in claim 1, wherein the heat exchange base comprises at least one lighting auxiliary structure, which protrudes outward from the two sides of the LED configuration plane to a predetermined length, assisting focusing or diverging the light generated by the LEDs of the LED array.

4. The LED lighting assembly as claimed in claim 1, wherein the hollow part is provided with a top opening and a bottom opening, defining an internal space for the insertion of the heat pipe and having an internal surface, and the heat exchange base further comprises at least one thermal stress pressing structure having a through hole and a connecting channel in communication with the hollow part and being arranged at a selected location at the heat exchange base, wherein during operation, the heat generated from the LEDs produces a thermal stress acts on the thermal stress pressing structure, makes the heat exchange base clamping to the heat pipe and lowers the thermal resistance between the heat exchange base and the heat pipe, and electrical wires are arranged at the connecting channel for supplying power to the LEDs.

5. The LED lighting assembly as claimed in claim 1, wherein the LED lighting assembly comprises a plurality of peripheral hollow parts arranged at specified locations of the heat exchange base for insertion of heat pipes, and each peripheral hollow parts is located adjacent to each of the LED configuration planes, in order to facilitate the conduction of the thermal energy generated by the LEDs of the LED array through the heat exchange base to the heated section of the heat pipes.

6. The LED lighting assembly as claimed in claim 1, wherein the LED configuration plane is parallel to the heat pipe, and the bottom of the LED is adhered flat to the LED configuration plane, so as to allow the light produced by the LED to be projected perpendicular to the heat pipe to the surroundings.

7. The LED lighting assembly as claimed in claim 1, wherein the LED array comprises at least one circuit board having an aperture where the LEDs are fitted to, such that the bottoms of LEDs and the bottom of the circuit board form a continuous flat surface for close contact between the LEDs and the LED configuration planes.