LED drive system and method

A technology of LED drive and drive system, which is applied in lighting devices, light sources, electrical components, etc., can solve the problems of high VCC-LED and difficulty in driving multiple LEDs, and achieve the effects of reducing VCCled, improving drive efficiency, and high brightness

Active Publication Date: 2018-09-14
SHENZHEN ZHENDI INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In LED driving, due to the output limitation of the driver chip, it is often difficult for one driver chip to drive multiple LEDs. - LED too high

Method used

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  • LED drive system and method

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Experimental program
Comparison scheme
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Embodiment 1

[0018] Refer to figure 1 , First of all, the LED driving system involved in the present invention is introduced as a whole. The LED lamp driven by the driving system can be a single or multiple single-color LEDs, or a single or multiple three-color LEDs (RGB- LED). The driving system includes a control unit, a driving unit, an interface unit, and a logic selection unit. The control unit is respectively connected to the driving unit and the logic selection unit. Both the driving unit and the logic selection unit are connected to the interface unit, and the LED is connected through the interface unit. Among them, the control unit is mainly responsible for sending control instructions. The control instructions include the brightness of the LED, on / off, and the selection signal of the LED; the drive unit is used to generate a stable drive current according to the control instruction to light the LED; the interface unit according to its internal Different structures can realize seri...

Embodiment 2

[0028] This embodiment focuses on the differences from Embodiment 1, and the similarities will not be repeated. Correspondingly, such as Figure 4 As shown, the present invention also provides an LED driving method for driving multiple LEDs, which includes the following steps: S100: generating a control signal of the LED, the control signal including at least the brightness signal of the LED and its selection signal; S200 : Output the drive current of the LED corresponding to the brightness signal; S300: output the turn-on signal of the LED corresponding to the selection signal; S400: make the drive current flow through the corresponding LED according to the turn-on signal .

[0029] Further, the step S100 includes: outputting the corresponding driving current to drive the LED through the driving module according to the input control signal; sampling the current flowing through the LED through the sampling module, the sampling result is negatively fed back to the driving module,...

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PUM

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Abstract

The invention discloses an LED drive system. The LED drive system comprises a control unit, a drive unit, an interface unit, a logic selection unit and a plurality of LEDs, wherein the control unit isused for generating control signals of the LEDs, and the control signals at least comprise brightness signals and selection signals of the LEDs; the drive unit is used for outputting drive current, corresponding to the brightness signals, of the LEDs; the logic selection unit is used for outputting conduction signals, corresponding to the selection signals, of the LEDs; the interface unit is usedfor enabling the drive current to flow through the corresponding LEDs according to the conduction signals. By means of the LED system, the drive efficiency is improved and the drive voltage is reduced.

Description

Technical field [0001] In general, the present invention relates to LED driving, and more particularly to an LED driving system and method. Background technique [0002] At present, LED has gradually become the main lighting source due to its small size, high brightness, energy saving and environmental protection. In LED driving, due to the output limitation of the driving chip, it is often difficult for one driving chip to drive multiple LEDs. In order to solve this problem, when it is necessary to drive multiple LEDs, the method of increasing the LED power supply voltage is usually used, which leads to VCC -The LED is too high. Take the ordinary RGB three-color lamp as an example, generally use MCU pin control directly, or use a three-color lamp driver chip. Most of the MCU pin output current is about 20mA, which can only drive a three-color lamp. For high-brightness RGB three-color lamps, MCU pins cannot be directly controlled by the MCU pin, and a drive circuit is required;...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10H05B45/00
Inventor不公告发明人
OwnerSHENZHEN ZHENDI INFORMATION TECH CO LTD