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Method for realizing stroboflash-free and noise-free PWM dimming

A noise-free, flicker-free technology, applied in electrical components and other directions, to achieve the effect of small current and high consistency of lamps

Active Publication Date: 2020-03-13
ZHUHAI SHENGCHANG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the noise problem has not been solved. We know that the sound frequency that the human ear can hear is between 20Hz-20KHz. To solve the noise problem, the PWM frequency needs to be 20KHz or above
At present, due to hardware factors, it is still blank in the market to achieve 20KHz or above and meet people's requirements for dimming depth of 0.1%, strobe exemption, and no noise.

Method used

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  • Method for realizing stroboflash-free and noise-free PWM dimming
  • Method for realizing stroboflash-free and noise-free PWM dimming

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Embodiment Construction

[0015] Such as figure 1 and figure 2 As shown, in this embodiment, the circuit used in the method for achieving flicker-free and noise-free PWM dimming includes a single-chip microcomputer, a drive circuit, a lamp, and a dimming signal output module, and the dimming signal output module and the The drive circuits are all electrically connected to the single-chip electromechanical device, and the lamp is electrically connected to the drive circuit. The method for realizing flicker-free and noise-free PWM dimming includes the following steps:

[0016] Steps from lightest to darkest:

[0017] a. The dimming signal output module transmits the dimming signal to the single-chip microcomputer. When the single-chip microcomputer receives the brightest dimming signal, the single-chip microcomputer outputs a PWM signal with a duty cycle of 100%, and the driving circuit receives the PWM signal. Drive the lamp to emit light after the signal;

[0018] b. The process of adjusting the di...

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Abstract

The invention discloses a PWM dimming method, and aims to provide a method for realizing stroboflash-free and noise-free PWM dimming by adjusting the dimming depth to 0.1%. The method for realizing stroboflash-free and noise-free PWM dimming comprises the following steps: when a dimming signal is in the brightest state and is adjusted from the brightest state to X%, the frequency of a PWM signal output by a single-chip microcomputer being greater than or equal to 20KHz; when the dimming signal is adjusted from X% to the darkest, adjusting the frequency of the PWM signal output by the single chip microcomputer from more than or equal to 20KHz to more than or equal to 3.12 KHz, and adjusting the duty ratio from less than or equal to 10% to less than or equal to 0.1%; when the dimming signalis adjusted to the lowest brightness, the PWM signal output by the single-chip microcomputer being greater than or equal to 3.12 KHz, and even if the duty ratio is less than or equal to 0.1%, a commondriving circuit can realize relatively high consistency. The invention is applied to the technical field of PWM dimming.

Description

technical field [0001] The invention relates to the technical field of lighting dimming, in particular to the technical field of PWM dimming. Background technique [0002] With the improvement of people's quality of life and the improvement of health concerns, people are paying more and more attention to the strobe of lights and the noise emitted by lamps. Low-frequency strobe lights will have an impact on personal health and safety, especially on the eyes. . The noise of lamps can disturb people's daily life. At present, many lamps use PWM technology to adjust the brightness of the light. The frequency of PWM directly affects the stroboscopic and noise of the lamps. However, the stroboscopic frequency of many lamps is less than 3KHz. The IEEE standard stipulates that the strobe with a frequency greater than 3.12KHz can be exempted, that is, it is considered to have no impact on personal health and safety, and it is also considered to be free of strobe by the industry. At...

Claims

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Application Information

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IPC IPC(8): H05B47/10
Inventor 郑德华赵显云
Owner ZHUHAI SHENGCHANG ELECTRONICS CO LTD