JP2002299695A - Led light-source appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems with conventional LED modules using a base for each, in which the size increase is difficult, all of the LED light-sources falls into the off state if an open-mode trouble happens in a single resistor in case where the LED light-sources are series connected, and a means for dissipating the heat generated by the LED light-sources is not efficient. SOLUTION: This LED light-source appliance comprises a base plate 1 having an upward-opened U-shaped cross-section and LED light-source modules. Each of the modules comprises a substrate of a hollow circular cylindrical shape, wherein one end of the substrate is open and is positioned on the lower planar part of the base plate, while the other end has a planar part, on which a plurality of LED light-sources are mounted. The heat dissipation efficiency is improved by using a material of high thermal conductivity such as metal for the material of the LED light-source modules. The connection circuit for the LED light sources is of series connection, wherein a Zener diode is connected to each LED light source with reverse polarity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting fixture using an LED light source, and more particularly to a configuration of a lighting fixture using a modularized LED light source and a compensation circuit for failure of the LED light source.

[0002]

2. Description of the Related Art FIG. 7 is a cross-sectional view of a conventional LED light source module described in Japanese Patent Laid-Open No.
2 is a connection diagram of an LED light source described in JP-A-9-213115. In FIG. 7, 3 is an LED light source, 13 is a substrate on which the LED light source 3 is mounted, and 14 is a base for supplying power to the LED light source 3. FIG. 8 shows an example in which LED light sources are connected in parallel, and FIG. 9 shows an example in which LED light sources are connected in series.

In this configuration, the LED light source 3 and the resin case 4 are supported by the base 14 serving as a power supply portion to the LED light source 3, thereby satisfying the function as a lighting fixture. The connection method of the LED light sources 3 is parallel connection or series connection.

[0004]

The conventional L as described above is used.
In the ED light source module, it is difficult to manufacture a large-sized LED light source module due to the problem of the strength of the base 14, and there is also a problem in a method of connecting the LED light sources 3. That is, when the LED light sources 3 are connected in parallel, L
It is necessary to connect a resistor for protecting the ED light source, which causes a power loss. In the case of serial connection, if one resistor fails in the open mode, the entire LED light source is turned off. Further, there is a problem that the heat generated from the LED light source 3 is not an efficient heat radiation means.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can use a large number of LED light sources, reduce power loss and cause one of the LED light sources connected in series to fail. It is another object of the present invention that the other LED light sources are not turned off.

[0006]

An LED according to the present invention
The light source fixture has a base with a U-shaped cross section that opens upward,
One end disposed on the lower flat portion of the base is open, and an LED light source module including a hollow cylindrical substrate having a plurality of LED light sources mounted on the other flat portion is provided.

Further, by using a material having high thermal conductivity such as metal as the material of the LED light source module, the heat radiation efficiency is improved.

Further, the connection circuit of the LED light sources is connected in series by connecting a zener diode to each of the LED light sources so as to have a polarity opposite to that of the LED light source.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an LED light source device according to an embodiment of the present invention will be described with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a partially cutaway perspective view showing an LED light source device according to Embodiment 1 of the present invention, and FIG.
It is sectional drawing of an ED light source module, and the transparent cover is added. FIG. 3 is a partially exploded perspective view of FIG. FIG. 4 is an enlarged sectional view of a principal part of the part of FIG. In FIG. 1, the LED light source device is disposed on a base 1 having a U-shaped cross section opened upward and a lower flat portion of the base 1.
The LED light source module 2 includes a hollow cylindrical substrate having one end open and a plurality of LED light sources mounted on a flat surface at the other end. FIG. 2 shows an example of a combination of the LED light source module 2 and the cover. That is, the transparent cover 4 arranged to cover the LED light source module 2
3 shows a state in which the light source module 2 is screwed and attached to a thread formed on a side wall of the light source module 2. FIG. 4 shows the connection state of the LED light source. An insulating layer 6 is formed on the flat surface of the LED light source module 2, and an electric circuit 7 is printed thereon.
The ED light source 3 is mounted.

In this configuration, the LED light source module 2 can be set to an arbitrary size,
By forming the light source module 2 from a metal material having high thermal conductivity, heat from the LED light source 3 can be efficiently guided to the base 1. Since the base 1 has a large surface area, the amount of heat radiation from the base 1 is large.

As described above, the number of LED light sources 3 can be increased, and the heat radiation effect can be enhanced.

Embodiment 2 FIG. FIG. 6 is a partially cutaway perspective view of the LED light source module part of the LED light source device according to Embodiment 2 of the present invention. The difference from the LED light source module 2 of FIG. That is, a Zener diode is arranged. FIG. 5 shows a connection circuit at this time. In FIG. 5, 3 is an LED light source and 11 is L
Zener diodes individually connected in parallel with the ED light source 3.

In FIG. 5, considering that one of the LED light sources 3 connected in series has a failure in the open mode, the Zener diode 11 connected in parallel with the failed LED light source 3 in reverse polarity. When this potential reaches the Zener voltage, the Zener diode 11 is almost short-circuited and a current flows through the entire circuit.

As described above, even if one of the LED light sources 3 connected in series fails in the open mode, the LED light sources 3 other than the failed LED light source 3 continue to light.

[0015]

As described above, according to the present invention, a large number of LED light sources can be used, the power loss is reduced, and even if one of the LED light sources connected in series fails, other LED light sources can be used. The light source is not turned off.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an LED light source device according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view of the LED light source module of FIG. 1, illustrating a state where a transparent cover is added.

FIG. 3 is a partially exploded perspective view of FIG. 2;

FIG. 4 is an enlarged sectional view of a part of the main part of FIG.

FIG. 5 is a connection diagram of an LED light source according to a second embodiment of the present invention.

FIG. 6 is a partially cutaway perspective view of an LED light source module unit according to Embodiment 2 of the present invention.

FIG. 7 is a cross-sectional view of a conventional LED light source module.

FIG. 8 is a connection diagram of a conventional LED.

FIG. 9 is another connection diagram of a conventional LED.

[Explanation of symbols]

Reference Signs List 1 base, 2 LED light source module, 3 LED light source, 4 transparent cover, 5 packing, 6 insulating layer, 7 electric circuit, 8 LED light source electrode, 9 solder, 10 electric wire, 11
Zener diode, 12 DC constant current power supply, 13 substrate, 14 bases.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05B 37/03 F21Y 101: 02 // F21Y 101: 02 F21S 1/02 G (72) Inventor Kenichi Yamada Kanagawa 2-14-40, Ofuna, Kamakura-shi, Japan Mitsubishi Electric Lighting Co., Ltd. F-term (reference)

Claims (5)

[Claims] 1. A base having an upwardly open U-shaped cross section and one end disposed on a lower flat portion of the base are open,
An LED light source device comprising an LED light source module comprising a hollow cylindrical substrate having a plurality of LED light sources mounted on a flat surface at the other end. 2. The LED light source device according to claim 1, further comprising a plurality of LED light sources connected in series, and a zener diode connected in parallel to each of the LED light sources so that the polarities are reversed. 3. The LED light source device according to claim 2, wherein the power supply unit is a DC constant current power supply. 4. A power supply connector inside the LED light source module.
The LED light source device according to the above. 5. The LED light source device according to claim 1, further comprising a transparent hollow cylinder upper cover arranged so as to surround the LED light source module.