LED light source module

A technology of LED module and LED light source, applied in the field of LED lighting, to achieve the effect of prolonging service life, improving efficiency and overcoming LED flickering

Inactive Publication Date: 2015-04-29
SICHUAN SUNFOR LIGHT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a white LED lighting device directly driven by alternating current with a constant current in order to solve the problem in the prior art that the alternating current directly drives the LED lighting device.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Such as figure 2 As shown, the protection unit 2 in this example is composed of a fuse F and a varistor VR. The fuse F is connected in series to the phase line L of the AC input terminal 1, and the varistor VR is connected in parallel to the phase line L and the neutral line N of the AC input terminal 1. between. The protection unit 2 is connected to the rectification unit 3 formed by the full-wave rectification circuit D1, and the output end of the rectification unit 3 is connected in parallel with 4 branches.

[0054]The first branch is composed of the first LED module and the first constant current unit in series. The first LED module is composed of one LED11, the positive end of which is connected to the positive pole of the rectification circuit D1, and the negative end is connected to the rectification circuit through the first constant current unit. D1 negative pole. In this example, the sampling is composed of a resistor network, including resistors R1 ~ R8. ...

Embodiment 2

[0058] image 3 The schematic diagram of the circuit of this example is shown, and it can be seen that this example is the same as that of Example 1 except that the LED module structure and its connection method are different from Example 1. The following only describes the structure of the LED module with four branch circuits. For other structures and their working process, please refer to the description of Embodiment 1, which will not be repeated here. The first LED module in the first branch of this example is composed of one LED31, the positive terminal of the first LED module is connected to the positive pole of the rectifier circuit D1, and the negative terminal of the first LED module is connected to the rectifier circuit through the first constant current unit D1 negative pole. The second LED module in the second branch of this example includes 4 LEDs in total, LED31, LED32, LED21, and LED22. When the first constant current unit is turned off, these 4 LEDs form a 2×...

Embodiment 3

[0062] Such as Figure 4 As shown, the circuit schematic diagram of this example is compared with that of Example 2. The connection mode of each LED module has been further optimized. The four LED modules in the four branches are composed of 16 LEDs and adopt a 4×4 matrix topology. . The first LED module in this example is composed of a 1×4 array composed of 4 LEDs connected in parallel, namely LED01, LED11, LED21 and LED31. The second LED module in this example is composed of a 2×4 array composed of 8 LEDs connected in series and parallel, including LED01, LED11, LED21, LED31, LED02, LED12, LED22, and LED32. The third LED module in this example is composed of LED01, LED11, LED21, LED31, LED02, LED12, LED22, LED32, LED03, LED13, LED23, LED33, a total of 12 LEDs connected in series and parallel to form a 3×4 array. The LED module consists of LED01, LED11, LED21, LED31, LED02, LED12, LED22, LED32, LED03, LED13, LED23, LED33, LED04, LED14, LED24, LED34, a total of 16 LEDs are c...

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Abstract

The invention discloses an LED light source module which comprises a sampling unit, a first branch formed through series connection of a first LED module and a first constant current unit, a second branch formed through series connection of a second LED module and a second constant current unit,... and an nth branch formed through series connection of an nth LED module and an nth constant current unit, wherein the sampling unit is connected with the constant current units; by means of different arrangement manners of LEDs in the LED modules as well as current values and turn-off and turn-on voltage set for the constant current units of the branches, the periodical blinking phenomenon caused by alternating voltage change can be avoided; current of each branch is constant, LED current change caused by junction temperature change can be prevented, and the reliability is improved; with increase of the number of branches, the drive current waveform can approximate to the form of sine wave, and power factor and efficiency of the light emitting device are improved; particularly, the LED modules are formed by the LEDs with controllable light emitting life, so that the LED blinking phenomenon caused by alternating current can be further prevented by means of LED light emitting afterglow.

Description

[0001] The present invention is a divisional application of the original application number 201210005714.2, the original application date is January 10, 2012, and the original invention name is a white LED lighting device directly driven by alternating current. technical field [0002] The invention relates to the field of LED lighting, in particular to an LED light source module. Background technique [0003] As a new type of solid-state light source, LED is expected to become a new generation of lighting source due to its advantages of energy saving, environmental protection and long life. As we all know, almost all existing LEDs are driven by direct current, but our production and living electricity is alternating current. Therefore, in currently used LED products, a power converter is needed to convert AC power into DC power. The introduction of power converters brings many negative effects. First, the life of the power converter is much lower than the life of the LED ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 李东明杨冕封正勇龙文涛赵昆张明
Owner SICHUAN SUNFOR LIGHT
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