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LED dimming control circuit and method, chip and lighting device
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A dimming control circuit and circuit 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 phenomenon. Effect
Pending Publication Date: 2021-06-11
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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Summary
Abstract
Description
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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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Embodiment 1
[0060] 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:
[0061] Start: 10000000 (write to Byte0, where B0[5:4]=00 to enter sleep mode)
[0062] Stop.
Embodiment 2
[0063] 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:
[0065] 00011111 (write Byte1, set OUT1~OUT5 output enable to be valid)
[0066] 00101000 (write to Byte2, set the range current of OUT1 to 40mA)
[0067] 00101000 (write to Byte3, set the range current of OUT2 to 40mA)
[0068] 00101000 (write to Byte4, set the range current of OUT3 to 40mA)
[0069] 00111100 (write to Byte5, set the range current of OUT4 to 60mA)
[0070] 00111100 (write to Byte6, set OUT5 range current to 60mA)
[0071] 10100010 (write to Byte7)
[0072] 10100000 (write Byte8, Byte7 and Byte8 together set...
Embodiment 3
[0082] Embodiment 3: Realize the simultaneous output of selected output channels OUT4~OUT5; the maximum current of OUT4~5 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:
[0083] Start1: 10110000 (write Byte0, normal mode, select Byte1)
[0084] 00011000 (write to Byte1, set OUT1~OUT3 output invalid, OUT4~OUT5 output valid)
[0085] 00000000 (write to Byte2, set OUT1 range current to 0mA)
[0086] 00000000 (write to Byte3, set OUT2 range current to 0mA)
[0087] 00000000 (write to Byte4, set OUT3 range current to 0mA)
[0088] 00111100 (write to Byte5, set the range current of OUT4 to 60mA)
[0089] 00111100 (write to Byte6, set OUT5 range current to 60mA)
[0090] Stop1 (here indicates the interval between frames)
[0091] Start2: 10111100 (write Byte0, normal mode, select Byte13)
[0092] 10100010...
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Abstract
The invention discloses an LED dimming control circuit and method, a chip and a lighting device. The circuit comprises a reference current module configured to provide five reference currents; an I2C communication controller which is configured to receive the clocksignal and the data signal, generate and output five paths of I2C control information so as to select an output channel which needs to be output and provide current and gray scale of the selected output channel; and five constant current driving modules, wherein each constant current driving module is configured to receive the corresponding reference current and the corresponding I2C control information, so as to output a driving signal through the corresponding output channel, adjust the current and the gray scale of the corresponding LED lamp string, and realize the dimming control of the five 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, method and lighting device. 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 market, mainly used for lan...
Claims
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Application Information
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