CN110881234B - Method for realizing non-stroboscopic and non-noise PWM dimming - Google Patents
Method for realizing non-stroboscopic and non-noise PWM dimming Download PDFInfo
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- CN110881234B CN110881234B CN201911352084.4A CN201911352084A CN110881234B CN 110881234 B CN110881234 B CN 110881234B CN 201911352084 A CN201911352084 A CN 201911352084A CN 110881234 B CN110881234 B CN 110881234B
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Abstract
The invention discloses a PWM dimming method, aiming at providing a PWM dimming method which can achieve dimming depth of 0.1% and realize no-strobe and no-noise dimming. The method for realizing the non-strobe and non-noise PWM dimming comprises the following steps: when the dimming signal is brightest and in the process of dimming to X% from the brightest, the frequency of the PWM signal output by the single chip microcomputer is more than or equal to 20 KHz; when the dimming signal is adjusted from X% to the darkest, the frequency of the PWM signal output by the single chip microcomputer is adjusted from more than or equal to 20KHz to more than or equal to 3.12KHz, and the duty ratio is adjusted from less than or equal to 10% to less than or equal to 0.1%; when the dimming signal is adjusted to the lowest brightness, the single chip outputs a PWM signal which is more than or equal to 3.12KHz, and even under the condition that the duty ratio is less than or equal to 0.1 percent, a common driving circuit can also realize higher consistency. The invention is applied to the technical field of PWM dimming.
Description
Technical Field
The invention relates to the technical field of lighting dimming, in particular to the technical field of PWM dimming.
Background
Along with the improvement of the quality of life of people and the improvement of paying attention to health, people pay more and more attention to the light stroboflash and the noise that lamps and lanterns sent, and the light stroboflash of low frequency can have the influence to health and safety, especially to the influence of eyes. The noise of the lamp can interfere with people's daily life. At present, a plurality of lamps can utilize the PWM technology to adjust the brightness of light, the frequency of PWM directly influences the stroboflash and the noise of the lamps, and the stroboflash frequency of the lamps is less than 3KHz at present. Stroboflash with frequency more than 3.12KHz regulated by the IEEE standard can be exempted, namely, the stroboflash is considered to have no influence on the health and safety of a human body and is considered to be not stroboflash by the industry. At present, manufacturers make the frequency to be 3KHz-4KHz, thereby achieving the stroboscopic exemption level. However, the problem of noise is not solved, and the frequency of sound which can be heard by human ears is between 20Hz and 20KHz, and the PWM frequency needs to be 20KHz or more to solve the problem of noise. At present, due to the factor of hardware, the requirement of people on dimming depth of 0.1%, stroboflash exemption and no noise is met while the factor of hardware is more than 20KHz, and the market is blank.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide a method for realizing PWM dimming without stroboflash and noise, wherein the dimming depth can reach 0.1%.
The technical scheme adopted by the invention is as follows: the circuit used by the method for realizing the non-stroboscopic and non-noise PWM dimming comprises a single chip microcomputer, a driving circuit, a lamp and a dimming signal output module, wherein the dimming signal output module and the driving circuit are both electrically connected with the single chip microcomputer, the lamp is electrically connected with the driving circuit, and the method for realizing the non-stroboscopic and non-noise PWM dimming comprises the following steps:
from brightest to darkest step:
a. the dimming signal output module transmits a dimming signal to the single chip microcomputer, the single chip microcomputer outputs a PWM signal with a duty ratio of 100% when receiving the brightest dimming signal, and the driving circuit drives the lamp to emit light after receiving the PWM signal;
b. the process that the dimming signal received by the single chip microcomputer is adjusted from 100% to X% is a duty ratio adjusting section in the range, the duty ratio of the PWM signal output by the single chip microcomputer becomes lower along with the decrease of the dimming signal, the frequency of the PWM signal output by the single chip microcomputer is not less than 20KHz, and the duty ratio of the PWM signal output by the single chip microcomputer is adjusted from 100% to not more than 10%;
c. the process that the dimming signal received by the single chip microcomputer is adjusted from X% to the lowest brightness is a mixed section of frequency adjustment and duty ratio adjustment, the PWM signal output by the single chip microcomputer is changed from the duty ratio adjustment to the frequency adjustment and the duty ratio adjustment at the same time, the frequency of the PWM signal is adjusted from more than or equal to 20KHz to more than or equal to 3.12KHz along with the adjustment of the dimming signal, and the duty ratio is adjusted from less than or equal to 10% to less than or equal to 0.1%; or the PWM signal output by the singlechip is changed from the duty ratio regulation into a first section of frequency regulation and then a second section of duty ratio regulation, the frequency of the PWM signal is regulated to be more than or equal to 3.12KHz from more than or equal to 20KHz along with the reduction of the dimming signal, and then the duty ratio of the PWM signal is regulated to be less than or equal to 0.1% from less than or equal to 10%;
d. when the single chip microcomputer receives the minimum brightness dimming signal, the frequency of a PWM signal output by the single chip microcomputer is more than or equal to 3.12KHz, and the minimum duty ratio is less than or equal to 0.1%;
adjusting the brightness from the lowest brightness to the highest brightness, and reversely repeating the steps;
the X% is a certain percentage point of the dimming signal, which can be adjusted according to the actual application and the dimming curve, so that the percentage point is not specified, and the frequency and the duty ratio are also given a maximum value, and the values of the frequency and the duty ratio can be adjusted within a given range in the actual application and different dimming curves.
The invention has the beneficial effects that: when the dimming signal is brightest and in the process of dimming from the brightest to X%, the frequency of the PWM signal output by the single chip microcomputer is more than or equal to 20KHz, the PWM signal drives the lamp to dim light, noise which can be heard by human ears can not be generated in the lamp and a circuit, and the lamp flicker frequency is far greater than the stroboscopic exemption level and is regarded as no stroboscopic; when the dimming signal is adjusted from X% to the darkest, the frequency of the PWM signal output by the single chip microcomputer is adjusted from more than or equal to 20KHz to more than or equal to 3.12KHz, the duty ratio is adjusted from less than or equal to 10% to less than or equal to 0.1%, the duty ratio of the PWM signal is low, the PWM signal drives the lamp to adjust the light, the current of the lamp is low, noise which can be heard by human ears cannot be generated, and the flicker frequency of the lamp is more than or equal to 3.12KHz, and the lamp is considered to be not stroboscopic when reaching the stroboscopic exemption level; when the dimming signal is adjusted to the lowest brightness, the singlechip outputs a PWM signal of about 3.12KHz, the frequency of the PWM signal is lower, and a common driving circuit can realize higher consistency even if the duty ratio is less than or equal to 0.1 percent, so that the dimming depth of the lamp can be easily realized to be less than 0.1 percent.
Drawings
FIG. 1 is a flow chart of the present invention;
fig. 2 is a schematic diagram of a circuit to which the present invention is applied.
Detailed Description
As shown in fig. 1 and fig. 2, in this embodiment, a circuit used in the method for implementing non-strobe and non-noise PWM dimming includes a single chip, a driving circuit, a lamp and a dimming signal output module, the dimming signal output module and the driving circuit are both electrically connected to the single chip, the lamp is electrically connected to the driving circuit, and the method for implementing non-strobe and non-noise PWM dimming includes the following steps:
from brightest to darkest step:
a. the dimming signal output module transmits a dimming signal to the single chip microcomputer, the single chip microcomputer outputs a PWM signal with a duty ratio of 100% when receiving the brightest dimming signal, and the driving circuit drives the lamp to emit light after receiving the PWM signal;
b. the process that the dimming signal received by the single chip microcomputer is adjusted from 100% to X% is a duty ratio adjusting section in the range, the duty ratio of the PWM signal output by the single chip microcomputer becomes lower along with the adjustment of the dimming signal, the frequency of the PWM signal output by the single chip microcomputer is not less than 20KHz, and the duty ratio of the PWM signal output by the single chip microcomputer is adjusted from 100% to not more than 10%; the frequency of the PWM signal output by the singlechip is more than or equal to 20KHz, the PWM signal drives the lamp to adjust the light, noise which can be heard by human ears can not be generated in the lamp and a circuit, and the lamp flicker frequency is far greater than the stroboscopic exemption level and is regarded as no stroboscopic;
c. the process that the dimming signal received by the single chip microcomputer is adjusted from X% to the lowest brightness is a mixed section of frequency adjustment and duty ratio adjustment, the PWM signal output by the single chip microcomputer is changed from the duty ratio adjustment to the frequency adjustment and the duty ratio adjustment at the same time, the frequency of the PWM signal is adjusted from more than or equal to 20KHz to more than or equal to 3.12KHz along with the adjustment of the dimming signal, and the duty ratio is adjusted from less than or equal to 10% to less than or equal to 0.1%; or the PWM signal output by the singlechip is changed from the duty ratio regulation into a first section of frequency regulation and then a second section of duty ratio regulation, the frequency of the PWM signal is regulated to be more than or equal to 3.12KHz from more than or equal to 20KHz along with the reduction of the dimming signal, and then the duty ratio of the PWM signal is regulated to be less than or equal to 0.1% from less than or equal to 10%; the frequency of the PWM signal output by the single chip microcomputer is adjusted from more than or equal to 20KHz to more than or equal to 3.12KHz, the duty ratio is adjusted from less than or equal to 10% to less than or equal to 0.1%, the duty ratio of the PWM signal is low, the PWM signal drives the lamp to adjust the light, the lamp current is low, noise which can be heard by human ears cannot be generated, and the flicker frequency of the lamp is more than or equal to 3.12KHz and reaches the stroboscopic exemption level to be regarded as no;
d. when the single chip microcomputer receives the minimum brightness dimming signal, the frequency of a PWM signal output by the single chip microcomputer is more than or equal to 3.12KHz, and the minimum duty ratio is less than or equal to 0.1%; the single chip microcomputer outputs PWM signals at 3.12KHz, the frequency of the PWM signals is low, and even if the duty ratio is less than or equal to 0.1%, a general driving circuit can also realize high consistency, so that the dimming depth of the lamp can be easily realized to be less than 0.1%.
And (4) adjusting the brightness from the lowest brightness to the highest brightness, and reversely repeating the steps.
The X% is a certain percentage point of the dimming signal, which can be adjusted according to the actual application and the dimming curve, so that the percentage point is not specified, and the frequency and the duty ratio are also given a maximum value, and the values of the frequency and the duty ratio can be adjusted within a given range in the actual application and different dimming curves.
The invention is applied to the technical field of PWM dimming.
While the embodiments of the present invention have been described in terms of practical embodiments, they are not to be construed as limiting the meaning of the present invention, and modifications of the embodiments and combinations with other embodiments will be apparent to those skilled in the art in light of the present description.
Claims (2)
1. A circuit used by the method for realizing the non-stroboscopic and non-noise PWM dimming comprises a single chip microcomputer, a driving circuit, a lamp and a dimming signal output module, wherein the dimming signal output module and the driving circuit are both electrically connected with the single chip microcomputer, and the lamp is electrically connected with the driving circuit, and the circuit is characterized in that: the method for realizing the non-strobe and non-noise PWM dimming comprises the following steps:
from brightest to darkest step:
a. the dimming signal output module transmits a dimming signal to the single chip microcomputer, the single chip microcomputer outputs a PWM signal with a duty ratio of 100% when receiving the brightest dimming signal, and the driving circuit drives the lamp to emit light after receiving the PWM signal;
b. the process that the dimming signal received by the single chip microcomputer is adjusted from 100% to X% is a duty ratio adjusting section in the range, the duty ratio of the PWM signal output by the single chip microcomputer becomes lower along with the decrease of the dimming signal, the frequency of the PWM signal output by the single chip microcomputer is not less than 20KHz, and the duty ratio of the PWM signal output by the single chip microcomputer is adjusted from 100% to not more than 10%;
c. the process that the dimming signal received by the single chip microcomputer is adjusted from X% to the lowest brightness is a mixed section of frequency adjustment and duty ratio adjustment, the PWM signal output by the single chip microcomputer is changed from the duty ratio adjustment to the frequency adjustment and the duty ratio adjustment at the same time, the frequency of the PWM signal is adjusted from more than or equal to 20KHz to more than or equal to 3.12KHz along with the adjustment of the dimming signal, and the duty ratio is adjusted from less than or equal to 10% to less than or equal to 0.1%; or the PWM signal output by the singlechip is changed from the duty ratio regulation into a first section of frequency regulation and then a second section of duty ratio regulation, the frequency of the PWM signal is regulated to be more than or equal to 3.12KHz from more than or equal to 20KHz along with the reduction of the dimming signal, and then the duty ratio of the PWM signal is regulated to be less than or equal to 0.1% from less than or equal to 10%;
d. when the single chip microcomputer receives the minimum brightness dimming signal, the frequency of a PWM signal output by the single chip microcomputer is more than or equal to 3.12KHz, and the minimum duty ratio is less than or equal to 0.1%;
the X% refers to a certain percentage point of the dimming signal, and the percentage point can be adjusted according to practical application and a dimming curve.
2. The method of claim 1, wherein the PWM dimming is performed without strobing and noise: and c, adjusting the brightness from the lowest brightness to the highest brightness, and repeating the steps a-d in the reverse direction.
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| CN201911352084.4A CN110881234B (en) | 2019-12-25 | 2019-12-25 | Method for realizing non-stroboscopic and non-noise PWM dimming |
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| CN116133187A (en) * | 2022-12-16 | 2023-05-16 | 珠海市圣昌电子有限公司 | Method for realizing selectable dimming PWM pulse frequency of LED dimming power supply |
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| CN201184533Y (en) * | 2007-11-16 | 2009-01-21 | 联想(北京)有限公司 | Combined lamp and electronic apparatus including the same |
| TW201352057A (en) * | 2012-06-01 | 2013-12-16 | Beyond Innovation Tech Co Ltd | Load driving apparatus relating to LED lamp and method thereof and illumination apparatus using the same |
| CN103068123A (en) * | 2012-12-25 | 2013-04-24 | 生迪光电科技股份有限公司 | Light emitting diode (LED) lamp with illumination intensity adjustable |
| CN203675404U (en) * | 2014-01-26 | 2014-06-25 | 青岛罗博飞海洋技术有限公司 | Control system for remote stepless LED lamp brightness adjustment |
| CN106163024B (en) * | 2015-03-25 | 2019-03-12 | 欧普照明股份有限公司 | A kind of PWM light-dimming method and PWM dimming device |
| CN105307307B (en) * | 2015-12-02 | 2017-04-12 | 东莞芯成电子科技有限公司 | LED dimming system |
| CN208479985U (en) * | 2018-04-18 | 2019-02-05 | 上海子光信息科技有限公司 | LED light adjusting system |
| CN209375977U (en) * | 2018-10-15 | 2019-09-10 | 深圳市星辰电源有限公司 | A kind of LED light is without stroboscopic dimming driving circuit |
| CN109275229B (en) * | 2018-10-22 | 2023-12-01 | 横店集团得邦照明股份有限公司 | Dimming circuit for detecting alternating current power supply waveform and dimming method thereof |
| CN109831848A (en) * | 2019-03-01 | 2019-05-31 | 深圳市星颖达实业有限公司 | A kind of LED drive circuit and lighting device |
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