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LED dimming control circuit, chip, lighting device and dimming control method

A dimming control circuit, LED light string technology, applied in the direction of energy-saving control technology, electrical components, etc., can solve the problems of flicker, poor dimming accuracy, single dimming effect, etc., achieve ultra-low standby power consumption, eliminate flicker effect of the phenomenon

Pending Publication Date: 2021-06-04
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing LED dimming control methods have the problems of poor dimming accuracy, flickering during the dimming process, and single-color dimming effects.

Method used

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  • LED dimming control circuit, chip, lighting device and dimming control method
  • LED dimming control circuit, chip, lighting device and dimming control method
  • LED dimming control circuit, chip, lighting device and dimming control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1: realize that the LED dimming control chip 71 enters the sleep mode (Sleep Mode), and does not perform dimming operation. Specifically, the input procedure of the MCU is as follows:

[0060] Start: 10000000 (write to Byte0, where B0[5:4]=00 to enter Sleep mode)

[0061] Stop.

Embodiment 2

[0062] Embodiment 2: Realize the simultaneous output of 5 output channels OUT1~OUT5; the maximum current of OUT1~OUT3 is 40mA, the grayscale of OUT1 is 2 / 1024, the grayscale of OUT2 is 512 / 1024, and the grayscale of OUT3 is 1022 / 1024; the maximum current of OUT4~OUT5 is 60mA , OUT4 grayscale 512 / 1024, OUT5 grayscale 1022 / 1024. Specifically, the input procedure of the MCU is as follows:

[0063] Start: 10110000 (write to Byte0, OUT1~OUT5 output at the same time, select Byte1)

[0064] 01001100 (write to Byte1, set the range current of OUT1~OUT3 to 40mA, and the range current of OUT4~OUT5 to 60mA)

[0065] 10100010 (write to Byte2)

[0066] 10100000 (write to Byte3, Byte2 and Byte3 together set OUT1 grayscale 2 / 1024)

[0067] 10100000 (write to Byte4)

[0068] 10110000 (write Byte5, Byte4 and Byte5 together set OUT2 grayscale 512 / 1024)

[0069] 10111110 (write Byte6)

[0070] 10111111 (write to Byte7, Byte6 and Byte7 together set OUT3 grayscale 1022 / 1024)

[0071] 10100000 ...

Embodiment 3

[0076] Embodiment 3: Realize the simultaneous output of selected output channels OUT4~OUT5; the maximum current of OUT4~OUT5 is 60mA, the grayscale of OUT4 is 2 / 1024, the grayscale of OUT5 is 512 / 1024; after 1mS, the grayscale of OUT4 is 512 / 1024, and the grayscale of OUT5 is 2 / 1024. Specifically, the input procedure of the MCU is as follows:

[0077] Start1: 10100000 (write to Byte0, OUT4~OUT5 output at the same time, select Byte1)

[0078] 00001100 (write to Byte1, set the range current of OUT1~OUT3 to 0mA, and the range current of OUT4~OUT5 to 60mA)

[0079] Stop1 (here indicates the interval between frames)

[0080] Start2: 10100111 (write Byte0, OUT4~OUT5 output at the same time, select Byte8)

[0081] 10100010 (write Byte8)

[0082] 10100000 (write to Byte9, Byte8 and Byte9 together set OUT4 grayscale 2 / 1024)

[0083] 10100000 (write Byte10)

[0084] 10110000 (write Byte11, Byte10 and Byte11 together set OUT5 grayscale 512 / 1024)

[0085] Stop2

[0086] Start3: 1...

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Abstract

The invention discloses an LED dimming control circuit, a chip, a lighting device and a dimming control method. The circuit comprises: a reference current module configured to provide first and second reference currents; an I2C communication controller configured to receive a clock signal and a data signal, generate and output five paths of I2C control information so as to select output channels which need to be output and provide current and gray scale of the selected output channels; first to third paths of constant current driving modules configured to receive the first reference current and the corresponding I2C control information so as to output driving signals through corresponding output channels and adjust current and gray scales of first to third paths of LED lamp strings; fourth to fifth paths of constant current driving modules configured to receive the second reference current and the corresponding I2C control information so as to output driving signals through the corresponding output channels and adjust the current and the gray scale of fourth to fifth paths of LED lamp strings. According to the invention, multiple channels are integrated, high-precision dimming can be realized, current control can be realized, and the flicker phenomenon in the dimming process can be eliminated.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an integrated multi-channel, high-precision dimming LED dimming control circuit, chip, lighting device and dimming control method. Background technique [0002] Since light emitting diode (Light Emitting Diode, referred to as LED) light source has the advantages of high efficiency and energy saving compared with traditional light source, under the background of global energy saving and emission reduction, LED light source is increasingly replacing traditional light source. At the same time, as people's life demands more and more, dimming (Dimming) applications also emerge as the times require. The so-called dimming means that according to the needs of users, the brightness of the light emitted by LED lights can be adjusted through devices such as light switches. [0003] At present, many LED lighting products based on LED dimming technology have appeared on the marke...

Claims

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Application Information

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IPC IPC(8): H05B45/10H05B45/345H05B47/165
CPCH05B45/10H05B45/345H05B47/165Y02B20/40
Inventor 孙顺根
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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