CN100472784C - Light-emitting diode module and light-emitting diode bulb made of same - Google Patents

Abstract

The invention relates to a light-emitting diode bulb, in order to solve the various problems caused by the limitation of the heat dissipation condition of the existing light-emitting diode bulb, the invention provides a light-emitting diode module with small volume and higher arrangement density, wherein, dozens of light-emitting diode wafers can be arranged to enhance the light-emitting effect; the invention also provides a bulb made of the module, wherein the ceramic heat dissipation part which has good heat dissipation performance, insulating effect and lower cost is additionally arranged on the basis of the common lamp holder, and the light-emitting diode module is tightly attached to the ceramic heat dissipation part, so that the light-emitting diode module can be well dissipated; the LED chips in the LED module can be connected in series, in parallel or in series after being connected in parallel.

Description

Light-emitting diode module and light-emitting diode bulb made therefrom

technical field

The invention relates to a lighting device, more specifically, to a light-emitting diode module and a light-emitting diode bulb made of it.

Background technique

Traditional lighting lamps include incandescent lamps, fluorescent lamps, etc. These lamps usually work at 110V or 220V, and have the characteristics of high power consumption, glare, and short lifespan. Since LEDs (light-emitting diodes) can work at lower voltages, and have low power consumption and long life, multiple LEDs can be combined to form a lighting lamp.

However, in the existing LED combination lamps, the LEDs usually adopt the cannonball-type packaging with a diameter of about 5mm, and its volume is much larger than that of the LED chip (the size of the LED chip is usually 12mil*12mil, which is equivalent to 0.3mm*0.3mm , its thickness is smaller), the number of LEDs that can be placed in a combination lamp is relatively limited; in addition, the luminosity of LEDs is usually proportional to the current flowing, and the heat generation will increase with the increase of current , due to the limitation of heat dissipation conditions, the number of LEDs should not be too large, and the current should not be too large, otherwise the temperature during operation will cause damage to the LEDs.

Due to the limitations of the above-mentioned size, working current, and heat dissipation conditions, there are usually only a few or a dozen LEDs in an ordinary LED combination lamp, and its luminous effect is not ideal, and it is usually necessary to configure a step-down circuit to provide it with proper work. voltage, the overall cost is higher, and the volume is larger.

Contents of the invention

Aiming at the above-mentioned disadvantages of the prior art, the present invention aims to solve the problems of the existing light-emitting diode bulbs, such as the limited number of light-emitting diodes, unsatisfactory luminous effect, and the need to configure corresponding step-down circuits due to the limitation of heat dissipation conditions.

In order to solve the above technical problems, the present invention firstly provides a light emitting diode module, including a circuit board and a plurality of light emitting devices mounted on the circuit board; wherein, the light emitting device is a light emitting diode chip without a casing, so Each of the light emitting diode chips is welded on the circuit board; a layer of light-transmitting colloid for fixing and protecting the light emitting diode chips is laid on the surface of the circuit board.

In the LED module of the present invention, a heat dissipation metal sheet can also be added, and the metal sheet is in close contact with the back of the circuit board. Multiple light emitting diode chips in the light emitting diode module can be connected in parallel, in series or mixed in multiple ways.

The present invention also provides a light-emitting diode bulb made of the above-mentioned light-emitting diode module, which includes a lamp cap for introducing power and a light-emitting diode module electrically connected to the lamp cap; The heat sink is mounted on the lower part of the lamp cap, and the lamp cap is electrically connected to the light-emitting diode module through a wire passing through the heat sink.

In the light-emitting diode bulb of the present invention, the lamp cap is preferably a standard lamp cap, and the heat sink is preferably a ceramic heat sink. The upper part of the ceramic heat sink is connected to the lower part of the lamp cap, and the lower part is connected to the light-emitting diode. Modules fit snugly. Preferably, a light-transmitting lampshade is added, and the lampshade is installed at the lower part of the heat sink, and the light-emitting diode module is covered inside it. The shape of the lampshade can be the same as that of an ordinary incandescent lamp; it can also be spherical, ellipsoidal, cuboid, or diamond-shaped; it can also be coated with a non-transparent material at an appropriate position of the lampshade to make the light emitting effect of the lampshade be numbers, letters, or text shapes.

In the light-emitting diode bulb of the present invention, a protection circuit can also be added, including a current limiting circuit and an antistatic circuit; the protection circuit is arranged on a protection circuit board, and the protection circuit board is installed between the lamp holder and the heat sink within the gap.

It can be seen from the above scheme that the present invention provides a light-emitting diode module with small size and high arrangement density, and provides a light bulb made of this module, wherein an additional A ceramic heat sink with good heat dissipation performance, insulation effect, and low cost is obtained, and the LED module is closely attached to the ceramic heat sink, so that the LED module can be well dissipated. Therefore, the LED module can be used Dozens of light-emitting diodes are set in the center to enhance its luminous effect; in addition, these light-emitting diodes can be connected in series with each other, or first connected in parallel and then connected in series. The alternating current of commercial power can be directly applied to the light-emitting diode module, so that the step-down circuit can be omitted, so as to achieve the purpose of reducing the cost.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a schematic diagram of the appearance of an LED bulb in one embodiment of the present invention;

Fig. 2 is an exploded schematic view of the LED bulb shown in Fig. 1;

Fig. 3 is a midline sectional view of the LED bulb shown in Fig. 1;

Fig. 4 is a bottom-view effect diagram after the light-transmitting lampshade of the LED bulb shown in Fig. 1 is removed;

FIG. 5 is a schematic diagram of the electrical connection relationship between the LEDs shown in FIG. 4;

Fig. 6 is a bottom view of an LED bulb in another embodiment of the present invention.

Detailed ways

A preferred embodiment of the present invention is shown in Fig. 1 to Fig. 4, as can be seen from the figure, this LED bulb is used for introducing the standard lamp base 11 of power supply, the ceramic heat sink 12 that is connected with lamp cap, and the ceramic heat sink that is connected with ceramic heat sink. Translucent lampshade 13. Wherein, the heat sink is connected to the lamp cap through a thread structure, and the lampshade is also connected to the heat sink through a thread structure. Of course, they can also be connected through a buckle structure.

The illuminant of the LED light bulb is an LED module 14, which includes an aluminum sheet 141 and a circuit board 142, the upper part of the aluminum sheet is in close contact with the lower part of the ceramic heat sink, and the lower part is in close contact with the circuit board, thereby enhancing heat dissipation Effect.

It can be seen from FIG. 4 that on the circuit board 142 of the LED module 14, there are a plurality of LEDs 143, all of which are small light-emitting diode chips with small volume and good luminous effect.

It can be seen from FIG. 3 that the electrical connection between the lamp holder 11 and the LED module 14 is realized through the wire 15 passing through the heat sink 12 . As shown in Figure 5, during specific implementation, the multiple LEDs in the LED module are preferably connected in the following way: one or more branches are set up, and the multiple branches are connected in parallel with each other on the circuit, and then connected to the Introduce the common power line of the working power supply; there are multiple lamp groups in each branch circuit, and each lamp group is connected in series; in each lamp group, there are two LEDs, and the two LEDs are connected to each other on the circuit. in parallel.

It can be seen from Figure 5 that in order to prevent the current from being too large, the current limiting resistor R1 is connected in series. Of course, other current limiting circuits can also be used; in addition, white, pure green, purple, and blue LEDs are easily damaged by static electricity. In the case of the case, an ordinary diode D1 is also connected in parallel, such as a diode with a model number of 1N4001, 1N4002, etc. Since the light bulb can be directly connected to an AC circuit, a full-wave rectification circuit can also be added in order to enhance the luminous effect. The aforementioned protection circuit and full-wave rectification circuit can be arranged on a protection circuit board (not shown in the figure), and the protection circuit board can be installed in the gap between the lamp cap and the heat sink.

In the above embodiments, the shape of the lampshade is the same as that of an ordinary incandescent lamp, and can be made of transparent plastic or glass. According to the needs of aesthetics, the lampshade 13 can also be in the shape of a sphere, an ellipse, a cuboid, a diamond, or other shapes with an aesthetic effect. In addition, as shown in Figure 6, non-transparent materials can also be coated on the appropriate position of the lampshade, so that the luminous effect of the lampshade is in the shape of numbers, letters, or characters. The luminous effect in the figure is the letter A, and the number 0 can also be included. -9, letters A-Z, wait, take a few of them, you can combine house numbers, bar signs, etc.

Claims (10)

1, a kind of light-emitting diode (LED) module comprises circuit board and is contained in a plurality of luminescent devices on the described circuit board; It is characterized in that,

Described luminescent device is that described each LED wafer is welded on the described circuit board not with the LED wafer of shell; Also be laid with the printing opacity colloid that one deck is used for fixing and protects described each LED wafer at described circuit board surface.

2, light-emitting diode (LED) module according to claim 1 is characterized in that, wherein also comprises a heat dissipation metal plate, and the back side of described sheet metal and described circuit board is close to.

3, light-emitting diode (LED) module according to claim 2, it is characterized in that, a plurality of LED wafer in the described light-emitting diode (LED) module are formed one or more branch road, parallel with one another on circuit between described each many branch road, be connected to the common source line that is used to introduce working power;

In each bar branch road, comprise a plurality of lamp groups, series connection successively between described a plurality of lamp groups;

In each lamp group, comprise at least two LED wafer, parallel with one another on circuit between described each LED wafer.

4, light-emitting diode (LED) module according to claim 3 is characterized in that, is provided with 1-4 LED wafer on the circuit board of each square centimeter.

5, a kind ofly it is characterized in that, comprise being used to introduce the lamp holder of power supply and the light-emitting diode (LED) module that is electrically connected with described lamp holder with the light emitting diode bulb that light-emitting diode (LED) module is made described in each among the claim 1-4; Also comprise the heat sink of being close to described light-emitting diode (LED) module, described heat sink is contained in the bottom of described lamp holder, and the lead through passing described heat sink between described lamp holder and the light-emitting diode (LED) module is electrically connected.

6, light emitting diode bulb according to claim 5, it is characterized in that described lamp holder is a standard lamp head, described heat sink is a ceramic heat-dissipating spare, the top of described ceramic heat-dissipating spare is connected with the bottom of described lamp holder, and the bottom then is close to described light-emitting diode (LED) module.

7, light emitting diode bulb according to claim 6 is characterized in that, also comprises a transparent lamp shade, and described lampshade is contained in the bottom of described heat sink, and described light-emitting diode (LED) module is covered on its inside.

8, light emitting diode bulb according to claim 7 is characterized in that, the profile of described lampshade is identical with the ordinary incandescent lamp profile, perhaps is spheroidal, oval sphere, cuboid or diamond.

9, light emitting diode bulb according to claim 7 is characterized in that, the appropriate location of described lampshade scribbles non-light transmissive material, makes the illumination effect of lampshade be numeral, letter or literal shape.

10, according to each described light emitting diode bulb in the claim 5, it is characterized in that, wherein also comprise protective circuit, comprise current-limiting circuit and antistatic circuit; Described protective circuit is located on the block protection circuit board, and described protective circuit plate is loaded in the space between described lamp holder and the heat sink.

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