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A dimming method for an LED driver

A technology of LED driving and LED lights, applied in the field of circuits, can solve problems such as difficult to achieve small current precision control, achieve the effect of improving stability and avoiding mutual crosstalk

Active Publication Date: 2021-06-25
GUANGZHOU YAJIANG PHOTOELECTRIC EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a dimming method of an LED driving device to solve the technical problem that the existing high-current driver is difficult to realize the precision control of small current. Dimming method with subdivision series and precision

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  • A dimming method for an LED driver
  • A dimming method for an LED driver
  • A dimming method for an LED driver

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0024] See figure 2 and image 3 , an embodiment of the present invention provides an LED driving device, including an LED lamp, a microprocessor, and N+1 constant current source branches electrically connected to the microprocessor, where N is an integer greater than or equal to 1;

[0025] The input end of the LED lamp is connected to the positive pole of the power supply, the output end of the LED lamp is respectively connected to the input end of each of the ...

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Abstract

The invention discloses a dimming method of an LED driving device. The LED driving device comprises an LED lamp, a microprocessor, and N+1 constant current source branches electrically connected to the microprocessor. The dimming The method comprises that the microprocessor sets the clock frequency in the microprocessor as GCLK, and the PWM period that the microprocessor outputs to each of the constant current source branches is T n+1 ; The microprocessor determines that each of the constant current source branch input PWM subdivision gray levels is g n+1 =GCLK / T n+1 , then the subdivision gray level of the LED driving device is G=(N+1)g n+1 ; The microprocessor controls the PWM signal output to each of the constant current source branches to adjust the subdivision current accuracy of the LED driving device. The embodiment of the present invention can increase the dimming level and accuracy of LED dimming gray level dimming method on the basis of realizing high current driving.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a dimming method for realizing LED dimming gray scales by an LED driving device that realizes constant current expansion through low-end current sampling. Background technique [0002] Due to the unique advantages of extremely high luminous efficiency and no mercury pollution, LED is recognized as the most ideal green lighting source today. The vigorous development and promotion of LED lighting has become the mainstream of modern lighting development. With the emergence of high-power LEDs, the current driving the LEDs has also increased from a few milliamps to tens of amperes, and the gray scale of LED dimming has also increased from 8 bits to more than 16 bits. However, the inventors of the present invention found in the research of the prior art that for LED drivers with a high current of a few amperes to more than ten amperes, only the accuracy of the high current can be ensured, so it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/30H05B45/325
CPCY02B20/40
Inventor 陈志曼黄荣丰陈运筹
Owner GUANGZHOU YAJIANG PHOTOELECTRIC EQUIP CO LTD
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