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LED (Light Emitting Diode) drive circuit

A technology of LED driving and driving current, applied in the direction of lamp circuit layout, electric light source, electrical components, etc., can solve the problems of low LED utilization rate, affecting the service life of the system, and uneven LED utilization rate.

Inactive Publication Date: 2014-01-08
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Seoul Semiconductor has proposed a sequential multi-level LED (light-emitting diode) light string structure control strategy. The basic structure of the LED light string is as follows: figure 1 As shown, the advantage of this working mode is that it is easy to control, and there is no problem of video flickering in any LED, but the LED utilization rate is unbalanced. For example, when the switch Sa is turned on, the LED La is always on; when the switch Sb is turned on , LED La and Lb are always emitting light; when switches Sa and Sb are turned off, LED La, Lb and Lc are always emitting light, it can be seen that the utilization rate of LED La is high, but the utilization rate of LED Lb and Lc is low, which may affect lifetime of the entire system
Therefore, the unreasonable structural design of the load LED will lead to low or unbalanced LED utilization, which will affect the service life of the entire system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] In this example, if image 3 As shown, the LED array includes two LEDs L1, L2 and two switches S1, S2, the two LEDs are respectively the first LED L1 and the second LED L2, and the cathode of the first LED L1 is connected to the second LED L1. The anodes of the two LED L2 are connected, and the anode of the first LED L1 and the cathode of the second LED L2 are respectively connected to the output voltage v o The high and low voltage terminals are connected, the two switches are the first switch S1 and the second switch S2 respectively, and the first switch S1 and the second switch S2 are respectively connected in parallel with the first LED L1 and the second LED L2 , the LED structure control circuit is used to control the on-off of the two switches S1 and S2.

[0126] In this embodiment, the first voltage value is the minimum voltage level, the third voltage value is the maximum voltage level, the first current value is the maximum current, and the third current value...

Embodiment 2

[0134] Compared with the technical solution in the first embodiment, this embodiment is different in steps 4 and 5 in the LED array and its driving method, and the rest of the technical features are the same as those in the first embodiment, which will not be repeated here.

[0135] In this example, if Figure 4 and Figure 5 As shown, the LED array includes three LEDs L3, L4, L5 and two switches S3, S4, the three LEDs are respectively the third LED L3, the fourth LED L4 and the fifth LED L5, the third The cathode of the LED L3 is connected to the anode of the fourth LED L4, the anode of the fourth LED L4 is connected to the anode of the fifth LED L5, the anode of the third LED L3 is connected to the anode of the fifth LED L5 Negative poles are respectively connected to the output voltage v o The high and low voltage terminals are connected, the two switches are respectively the third switch S3 and the fourth switch S4, the third switch S3 is connected in parallel with the t...

Embodiment 3

[0143] Compared with the technical solutions in the previous two embodiments, this embodiment is different in steps 4 and 5 in the LED array and its driving method, and the rest of the technical features are the same as those in the previous two embodiments, so it will not be repeated here. repeat.

[0144] In this example, if Image 6 As shown, the LED array includes three LEDs L6, L7, L8 and four switches S5, S6, S7, S8, the three LEDs are respectively the sixth LED L6, the seventh LED L7 and the eighth LED L8, The negative pole of the sixth LED L6 is connected to the positive pole of the seventh LED L7, the negative pole of the seventh LED L7 is connected to the positive pole of the eighth LED L8, and the positive pole of the sixth LED L6 is connected to the positive pole of the eighth LED L8. The negative poles of the eight LEDs L8 are respectively connected to the output voltage v o The high and low voltage terminals are connected, and the four switches include the fift...

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Abstract

The invention provides an LED (Light Emitting Diode) drive circuit. The LED drive circuit comprises a rectifier circuit, a drive current generation circuit, a bus voltage detection circuit, an LED structure control circuit and an LED array. According to the LED drive circuit provided by the invention, the LED array in the prior art is changed on the basis of reducing energy consumption or realizing a high PF (Performance Factor) value, and a utilization rate of each LED is adjusted through switching each switch, so that the utilization rate of the LED in the LED array is more uniform, thus the service life of the LED drive circuit is prolonged.

Description

technical field [0001] The invention relates to a driving circuit, in particular to an LED driving circuit. Background technique [0002] In order to meet the relevant harmonic standards, the PF (Power Factor, referred to as power factor) value of the AC-DC LED driver (AC-DC light-emitting diode driver) must be within the specified range. Traditional AC-DC LED drivers are divided into single-stage AC-DC LED drivers and two-stage AC-DC LED drivers. A single-stage AC-DC LED driver can achieve a high PF value by designing reasonable parameters, but the control variables are limited, which is not conducive to optimizing the efficiency of the LED driver, and electrolytic capacitors must be used, which affects the service life of the LED driver. There may be video flickering issues. The two-stage AC-DC LED driver can adopt full variable control to achieve a high PF value, which is conducive to optimizing the efficiency of the LED driver, and can achieve no video flicker. Since ...

Claims

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Application Information

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IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/44
Inventor 余峰赵晨
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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