CA2844719A1

CA2844719A1 - High power led bulb

Info

Publication number: CA2844719A1
Application number: CA2844719A
Authority: CA
Inventors: Liang NI
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-03-13
Filing date: 2014-03-04
Publication date: 2014-09-13
Also published as: CN203223778U

Abstract

The invention relates to LED lighting technology, more particularly a high power LED bulb which improves heat dissipation effect by improving heat dissipation channels of an LED bulb.
The high power LED bulb comprises a holder, a lamp housing and a lamp shade, the holder is internally provided with a power module, the lamp housing is internally provided with a substrate and radiators, LEDs are installed on the substrate, sealed in the lamp shade and connected with the power module, the substrate is provided with a through hole, the holder is of tubular shape and has a sealed end and an open end extending into the lamp housing and communicated with the outside through the through hole, a vent hole is arranged on the holder exposing the lamp housing, and the lamp housing is provided with heat dissipation holes communicated with the outside through the through hole. The high power LED
bulb greatly improves heat dissipation effect of LED bulbs.

Description

High Power LED Bulb Field of the Invention [0001] The invention relates generally to the field of LED lighting technology, in particular to a high power LED bulb.
Description of the Related Art

[0002] In recent years, LED lighting technology has developed rapidly, and various high power LED bulbs have been available in the market successively and widely applied. An LED
bulb has comparatively similar appearance and structure to general lighting bulbs such as incandescent lamps and energy-saving lamps, and is composed of a holder, a lamp housing and a lamp shade. The holder is generally of screw structure and can be directly connected to alternating current. The holder is internally provided with a power module for converting AC
voltage into LED operating voltage. The lamp housing is internally provided with a substrate and radiators, and LEDs of different quantities are installed on the substrate based on different powers and LED power capacities. In order to protect LED chips and avoid stimulation from strong light, the LEDs are sealed in the lamp shade, and each LED is connected with the power module through a circuit on the substrate. However, as high power LEDs have large calorific capacity in operation, LED chips will suffer from irreversible damage if heat is untimely exchanged with the atmosphere, accelerating light failure of LEDs. Existing high power LED
bulbs have inappropriate heat dissipation in structural design, resulting in abnormal light failure of LED and shortened service life of LED drive power. In practical application, these LED
bulbs have low heat dissipation efficiency, resulting in heat accumulation and accelerating light failure of LEDs. Meanwhile, heated air rises, and temperature at holder part rises, aggravating heat accumulation of the power modules encapsulated in the holders, thus greatly shortening the service life of power module components, and becoming bottleneck of the service life of high power LED bulbs.
Summary of the Invention

[0003] For the structural disadvantage of poor heat dissipation of high power LED bulbs in the prior art, a technical problem to be solved by the invention is to provide a high power LED
bulb to improve heat dissipation effect by improving heat dissipation channels of an LED bulb.

[0004] A technical solution to solving the technical problem is a high power LED bulb comprising a holder, a lamp housing and a lamp shade, the holder is internally provided with a power module, the lamp housing is internally provided with a substrate and radiators, and LEDs are installed on the substrate, sealed in the lamp shade and connected with the power module, and the high power LED bulb is characterized in that the substrate is provided with a through hole, the holder is of tubular shape and has a sealed end and an open end extending into the lamp housing and communicated with the outside through the through hole, a vent hole is arranged on the holder exposing the lamp housing, and the lamp housing is provided with heat dissipation holes communicated with the outside through the through hole.

[0005] The technical solution is as follows: heat generated by the power module in the tubular holder can be dissipated by convection through the open end and the vent hole on the holder, and heat generated by the radiators installed on the substrate can be dissipated by convection through the through hole on the substrate and the heat dissipation holes on the lamp housing. The two heat dissipation channels are independent, thus greatly improving heat dissipation effect on the premise of ensuring seal integrity of LEDs.

[0006] Preferably, the open end of the holder is of conical shape and passes through the through hole.

[0007] The open end of the holder is of conical shape and passes through the through hole, and can isolate the two heat dissipation channels in a better manner.
Increased length of the tubular holder is favorable for improving heat dissipation of the power module in the holder.
The conical structure of the open end of the holder can increase air circulation and improve heat dissipation effect of radiators in the lamp housing.

[0008] Further, the LEDs are uniformly distributed around the through hole.

[0009] Uniform distribution of the LEDs can improve luminance uniformity of the bulb, and improve lighting effects.

[0010] The recommended installation positions of the LEDs are corresponding to installation positions of the radiators.

[0011] In the solution, the radiators and the LEDs are respectively installed at both sides of the substrate, and the installation positions of the radiators are corresponding to the installation positions of the and the LEDs, which is favorable for improving heat dissipation effect of the LEDs and reducing light failure.

[0012] Specifically, the heat dissipation holes are arranged on the side wall and/or at the top of the lamp housing.

[0013] The heat dissipation holes are arranged on the side wall or at the top of the lamp housing, and can be selected based on detailed design. Dustproof effect is good when the heat dissipation holes are arranged on the side wall of the lamp housing, and air mobility is good when the heat dissipation holes are arranged at the top of the lamp housing, either of them has its own advantage.

[0014] Specifically, the substrate is an aluminum substrate.

[0015] Aluminum substrate is a widely used LED lighting substrate, and characterized by low cost and high thermal conductivity.

[0016] Specifically, the radiators are graphite radiators.

[0017] Graphite radiators are characterized by convenient processing and good formability, and very suitable for heat dissipation of LED lighting devices.

[0018] The high power LED bulb has the following benefits: the power module and heat dissipation channels of the LED radiators are reasonably designed based on structural features of the bulb, thus greatly improving heat dissipation efficiency and extending the service life of the bulb. The high power LED bulb is also characterized by compact structure and attractive appearance.
Brief Description of the Drawings

[0019] Figure 1 is a schematic diagram of example 1;

[0020] Figure 2 is a top view of Figure 1;

[0021] Figure 3 is a schematic diagram of distribution of LEDs on a substrate of example 1;

[0022] Figure 4 is a schematic diagram of distribution of radiators on the substrate of example 1;

[0023] Figure 5 is a schematic diagram of example 2;

[0024] Figure 6 is a top view of Figure 5;

[0025] Figure 7 is a schematic diagram of distribution of LEDs on the substrate of example 2; and

[0026] Figure 8 is a schematic diagram of distribution of radiators on the substrate of example 2.

[0027] In the figures, 1 represents a holder, 10 represents a vent hole, 11 represents a power module, 2 represents a lamp housing, 20 represents heat dissipation holes, 21 represents radiators, 3 represents a lamp shade; 30 represents LEDs, 31 represents a substrate, 32 represents a through hole, and arrows A and B represent air flow directions.
Description of the Preferred Embodiments

[0028] The technical solution will be described in detail in combination with drawings and examples.

[0029] For the high power LED bulb, different heat dissipation channels are designed for the power module and LED radiators so as to completely avoid heat accumulation and superposition, and greatly improve heat dissipation conditions of the bulb.
Heat generated by the power module in the tubular holder can be dissipated by convection through the open end and the vent hole on the holder, and heat generated by the radiators installed on the substrate can be dissipated by convection through the through hole on the substrate and the heat dissipation holes on the lamp housing. The two heat dissipation channels are independent, thus greatly improving heat dissipation effect on the premise of ensuring seal integrity of LEDs.

[0030] Example 1

[0031] Referring to Figures 1 to 4, the high power LED bulb in the example comprises a holder 1, a lamp housing 2 and a lamp shade 3. The holder 1 is internally provided with a power module 11, the lamp housing 2 is internally provided with an aluminum substrate 31 and graphite radiators 21, and six LEDs 30 are installed on the back of the aluminum substrate 31, uniformly distributed around a through hole 32 on the aluminum substrate 31, and sealed in the lamp shade 3. Radiators 21 of the same number are installed at positions corresponding to the LEDs 30 on the front of the aluminum substrate 31 for improving heat dissipation effect. If power of each LED is low and installation density is low, the quantity of radiators 21 can be properly reduced to reduce the bulb weight and cost. The lamp shade 3 is generally made of a transparent material such as glass, the lamp housing 2 can be made of plastic or metal, and the holder 1 has metal thread for connecting to alternating current. The aluminum substrate 31 is provided with circuits, and the LEDs 30 are connected with the power module 11 through leads. It can be seen from Figure 1 that the holder 1 in the example is of tubular shape and has a sealed end and an open end, the open end is of conical shape, extends into the lamp housing 2 and is communicated with the outside through the through hole 32 on the aluminum substrate 31. A vent hole 10 is arranged on the holder 1 exposing the lamp housing 2 and communicated with the open end of the holder 1, and air enters the holder 1 in the direction of arrow B and carries away heat generated by the power module 11 through the through hole 10. Heat dissipation holes 20 arranged on the lamp housing 2 are communicated with the outside through the through hole 32, and air enters the lamp housing 2 in the direction of arrow A, exchanges heat with the radiators 21 and carries away heat through the heat dissipation holes 20. The conical structure of the open end of the holder 1 can increase air flow in the direction of arrow A and improve heat dissipation effect of the radiators 21 in the lamp housing 2. It can be seen from Figures 1 and 2 that the heat dissipation holes 20 in the example are arranged at the top of the lamp housing 2, and uniformly distributed around the holder 1.
Such heat dissipation holes can be made into heat dissipation holes of shutter type to improve dustproof effect. The LED bulb in the example has a cylindrical shape and a symmetrical structure, thus the LED bulb is beautiful and practical, and easy in processing and manufacture.

[0032] Example 2

[0033] The LED bulb in the example has a structure as showed in Figures 5 to 8, the holder 1 is of cylindrical shape, the lamp housing 2 is of right quadrangular prism shape, and the corresponding aluminum substrate 31 is of square shape, as shown in Figures 7 and 8. As shown in Figure 5, the heat dissipation holes 20 in the example are arranged on the side wall of the lamp housing 2 for dust prevention and heat dissipation. Refer to description of example 1 for other structures in the example.

[0034] Various embodiments of the invention have now been described in detail.
Those skilled in the art will appreciate that numerous modifications, adaptations and variations may be made to the embodiments without departing from the scope of the invention, which is defined by the appended claims. The scope of the claims should be given the broadest interpretation consistent with the description as a whole and not to be limited to these embodiments set forth in the examples or detailed description thereof.

Claims

- 7 -WHAT IS CLAIMED IS:

1. A high power LED bulb, comprising a holder, a lamp housing and a lamp shade, the holder being internally provided with a power module, the lamp housing being internally provided with a substrate and radiators, and LEDs being installed on the substrate, sealed in the lamp shade and connected with the power module, characterized in that the substrate is provided with a through hole, the holder is of tubular shape and has a sealed end and an open end extending into the lamp housing and communicated with the outside through the through hole, a vent hole is arranged on the holder exposing the lamp housing, and the lamp housing is provided with heat dissipation holes communicated with the outside through the through hole.

2. The high power LED bulb of claim 1, characterized in that the open end of the holder is of conical shape and passes through the through hole.

3. The high power LED bulb of claim 1, characterized in that the LEDs are uniformly distributed around the through hole.

4. The high power LED bulb of claim 3, characterized in that installation positions of the LEDs are corresponding to installation positions of the radiators.

5. The high power LED bulb of claim 1, characterized in that the heat dissipation holes are arranged on the side wall and/or at the top of the lamp housing.

6. The high power LED bulb of any one of claims 1 to 5, characterized in that the substrate is an aluminum substrate.

7. The high power LED bulb of claim 6, characterized in that the radiators are graphite radiators.