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A method for increasing the gray level of an LED lamp

A technology of LED lamps and grayscale, applied in the use of semiconductor lamps, electrical components, electroluminescent light sources, etc., can solve the problem of difficulty in increasing grayscale for LED lamps

Active Publication Date: 2019-01-04
GUANGZHOU YAJIANG PHOTOELECTRIC EQUIP CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a method for increasing the gray scale of LED lamps, aiming at solving the problem that the current LED lamps are difficult to increase the gray scale, and providing a method that can increase the gray scale of LED lamps

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  • A method for increasing the gray level of an LED lamp
  • A method for increasing the gray level of an LED lamp

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Embodiment Construction

[0011] like figure 1 As shown, the method for increasing the gray level of an LED lamp according to the present invention includes the following steps: S1, setting the refresh frequency of the PWM, and using the PWM frequency as the frequency of the original PWM; S2, according to the frequency of the PWM and the frequency of the original PWM Calculate the number N of cycles required to reduce the PWM frequency, so that the total cycle including N cycles is used as the new PWM; S3, assign the duty cycle of each cycle in the new PWM according to the duty cycle or grayscale of the cycle that requires PWM or grayscale output.

[0012] Compared with the prior art, the invention discloses a method for increasing the gray scale of LED lamps. Before outputting PWM each time, the amount of change in gray scale is changed according to the cycle required for PWM down-frequency to form a new PWM cycle. , so as to achieve the purpose of increasing the gray level of the PWM while reducing ...

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Abstract

The invention discloses a method for increasing the gray level of an LED lamp, which comprises the following steps: S1, the refresh frequency of the PWM is set, and the PWM frequency is used as the frequency of the original PWM; S2, calculating the number of cycles N required to reduce the PWM frequency according to the frequency requiring the PWM and the original PWM frequency, and taking the total period of N cycles as the new PWM; S3, allocating the duty cycle or gray scale of each cycle in the new PWM according to the duty cycle or gray scale of the cycle in which the PWM is required, andoutputting the duty cycle or gray scale. In accordance with that prior art, The invention discloses a method for increasing the gray level of an LED lamp. Before each PWM is output, the change amountof the gray level is changed according to the cycle required by the PWM frequency reduction so as to form a new PWM cycle, thereby realizing the purpose of reducing the refresh frequency of the PWM and simultaneously increasing the gray level of the PWM. The invention solves the problem that it is difficult to increase the gray level of the LED lamp at present, and provides a method for increasingthe gray level of the LED lamp.

Description

technical field [0001] The invention relates to the field of lamps, in particular to a method for increasing gray levels of LED lamps through PWM dimming and frequency division. Background technique [0002] At present, most LED lamps use MCU to control PWM for dimming. When PWM is used for dimming, the frequency of PWM and its period are inversely proportional. . However, LED lighting has a wide range of applications and scenes. For example, when performing a drama in a theater, a very low refresh rate may be required to highlight the stripes that appear in the recording of high-definition photography equipment. At present, in the case of splitting a 32-bit timer by the MCU to realize 2-way PWM dimming, the maximum period of one-way PWM is 65535, which is often said to be 16bit maximum grayscale. If the PWM frequency is forcibly reduced, it will cause The period value is greater than the maximum period of the PWM, resulting in data overflow and unable to dim normally. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10Y02B20/30Y02B20/40
Inventor 陈志曼黄荣丰陆神房
Owner GUANGZHOU YAJIANG PHOTOELECTRIC EQUIP CO LTD
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