CN102487566B - LED light source jitter removal control method and circuit thereof - Google Patents
LED light source jitter removal control method and circuit thereof Download PDFInfo
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Abstract
The invention relates to an LED light source jitter removal control method which comprises the following steps: S1. according to a predetermined sampling time interval, sampling an output voltage value of an LED light source many times to obtain a plurality of sampling values, and carrying out processing of removing a maximum value and a minimum value and calculating an average value on the sampling values to obtain an average sampling value; S2. comparing the average sampling value with a set value to obtain a comparison result; S3. determining a duty ratio of a PWM circuit according to the comparison result, wherein, the PWM circuit is used for adjusting the current of the LED light source. The invention also relates to an LED light source jitter removal control circuit. According to the method and the circuit of the invention, through carrying out processing of removing the maximum value and the minimum value and calculating the average value on the sampling values and reducing and adjusting frequency of LED light source current, up and down fluctuation of a current value around a set value is reduced on the basis of not influencing LED light source constant current driving, and tiny flicker and jitter of LED light source intensity are reduced.
Description
Technical field
The present invention relates to the circuit control field, more particularly, relate to a kind of LED light source debounce flowing control method and circuit.
Background technology
At present, if lower singlechip chip is realized the constant current function of constant-current source with working clock frequency, can the generation current value can not be stabilized on set point, thereby there will be the fluctuation of current value, the fluctuation of current value shows on result of use, for when LED light source is worked, the situation of shake appears in the light of LED light source, greatly affects the comfort of LED light source.
Summary of the invention
The technical problem to be solved in the present invention is, the defect of the light shake of the LED light source caused due to the fluctuation of current value for the above-mentioned constant-current source of prior art, provide a kind of and can, under the prerequisite of the structure that does not change hardware, effectively prevent LED light source debounce flowing control method and the circuit of LED light source shake.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of LED light source debounce flowing control method, comprising step: S1, according to repeatedly the sample output voltage values of LED light source of predetermined sampling time interval, obtain a plurality of sampled values; Described a plurality of sampled values are gone to be worth most be averaged processing, obtained the average sample value; S2, by described average sample value and set point relatively, obtain comparative result; S3, according to described comparative result the duty ratio of definite pwm circuit, described pwm circuit is for adjusting the electric current of described LED light source.
In LED light source debounce flowing control method of the present invention, described step S1 comprises step: the output voltage values of S11, the described LED light source of sampling obtains the first sampled value; The output voltage values of the described LED light source of time sampling of S12, the described sampling time interval of process, obtain the second sampled value; S13, more described the first sampled value and described the second sampled value, save as maximum sampled value wherein greatlyr, less saves as minimum sampled value, and described the first sampled value and described the second sampled value addition save as accumulated value; S14, through the output voltage values of the described LED light source of time sampling of described sampling time interval, by its assignment to the subsequent sampling value; S15, more described subsequent sampling value and described maximum sampled value, save as maximum sampled value wherein greatlyr; More described subsequent sampling value and described minimum sampled value, wherein less save as minimum sampled value; Described subsequent sampling value is added up in described accumulated value and upgrades and preserve; The number of times that S16, repeating step S14 and S15 set; S17, average sample value=(accumulated value-maximum sampled value-minimum sampled value)/(sampling number-2).
In LED light source debounce flowing control method of the present invention, comprise step: S0 before described step S1, set described sampling time interval, described set point and described sampling number.
In LED light source debounce flowing control method of the present invention, in described step S1, also comprise, the output voltage values that sampling is obtained carries out analog digital and is converted to sampled value.
In LED light source debounce flowing control method of the present invention, described step S3 comprises: when described average sample value is greater than described set point, reduce the electric current of described LED light source by the duty ratio of controlling described pwm circuit; When described average sample value is less than described set point, increase the electric current of described LED light source by the duty ratio of controlling described pwm circuit.
The invention still further relates to the moving control circuit of a kind of LED light source debounce, comprising sampling module: for repeatedly the sample output voltage values of LED light source of the sampling time interval according to predetermined, obtain a plurality of sampled values; Described a plurality of sampled values are gone to be worth most be averaged processing, obtained the average sample value; Comparison module: for described average sample value and set point are compared, obtain comparative result; And adjusting module: for the duty ratio of the pwm circuit definite according to described comparative result, described pwm circuit is for adjusting the electric current of described LED light source.
In the moving control circuit of LED light source debounce of the present invention, described sampling module comprises: sampling unit: the output voltage values for the described LED light source of sampling according to described sampling time interval and sampling number obtains sampled value; Be worth most judging unit: for maximum and the minimum value of calculating sampling value; Cumulative unit: for calculating the accumulated value of all sampled values; And output unit: for according to average sample value=(accumulated value-maximum sampled value-minimum sampled value)/(sampling number-2), exporting described average sample value.
In the moving control circuit of LED light source debounce of the present invention, the moving control circuit of described LED light source debounce also comprises: setting module: for setting described sampling time interval, described set point and described sampling number.
In the moving control circuit of LED light source debounce of the present invention, described sampling module also comprises: AD conversion unit: carry out analog digital for the output voltage values that sampling is obtained and be converted to sampled value.
In the moving control circuit of LED light source debounce of the present invention, described adjusting module, for when described average sample value is greater than described set point, reduces the electric current of described LED light source by the duty ratio of controlling described pwm circuit; When described average sample value is less than described set point, increase the electric current of described LED light source by the duty ratio of controlling described pwm circuit.
Implement LED light source debounce flowing control method of the present invention and circuit, there is following beneficial effect: by sampled value repeatedly being gone to be worth most be averaged to process, reduce the frequency of adjusting the LED light source electric current, reach not affect on the basis that the LED light source constant current drives and reduced the up and down fluctuation of current value around set point, thereby reduced small flicker and the shake of LED light source light intensity.
Setting by sampling time interval, set point and sampling number can reach the best moving effect of debounce.Magnitude of voltage makes comparative result more accurate through analog-to-digital conversion.Carry out the electric current adjustment of LED light source by pwm circuit, adjust precision high.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the flow chart of the first preferred embodiment of LED light source debounce flowing control method of the present invention;
Fig. 2 is the flow chart of the second preferred embodiment of LED light source debounce flowing control method of the present invention;
Fig. 3 is the flow chart of the 3rd preferred embodiment of LED light source debounce flowing control method of the present invention;
Fig. 4 is the structural representation of the first preferred embodiment of the moving control circuit of LED light source debounce of the present invention;
Fig. 5 is the structural representation of the 3rd preferred embodiment of the moving control circuit of LED light source debounce of the present invention;
Fig. 6 is the structural representation of the 3rd preferred embodiment of the moving control circuit of LED light source debounce of the present invention;
Fig. 7 is the structural representation of the 4th preferred embodiment of the moving control circuit of LED light source debounce of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
We know, because the voltage waveform of actual samples is nonlinear from microcosmic point, also just say that sampled value is suddenly big or suddenly small, so will cause the unstable of current value.When the single-chip microcomputer working clock frequency is low, if each sampled value is all made to comparison, and the duty ratio of regulating PWM, there will be current value to fluctuate up and down in set point, be reflected on LED circuit, be exactly small flicker, the shake of brightness.Adopt LED light source debounce flowing control method of the present invention and circuit for addressing this problem, reduced by sampled value repeatedly going to be worth most be averaged to process the frequency of adjusting the LED light source electric current, reach not affect on the basis that the LED light source constant current drives and reduced the up and down fluctuation of current value around set point, thereby reduced small flicker and the shake of LED light source light intensity.
In the flow chart of the first preferred embodiment of the LED light source debounce flowing control method of the present invention shown in Fig. 1, described LED light source debounce flowing control method starts from step 100, arrive subsequently next step 101, according to repeatedly the sample output voltage values of LED light source of predetermined sampling time interval, obtain a plurality of sampled values; Described a plurality of sampled values are gone to be worth most be averaged processing, obtained the average sample value; Arrive subsequently next step 102, by described average sample value and set point relatively, obtain comparative result; Arrive subsequently next step 103, the duty ratio of definite pwm circuit according to described comparative result, described pwm circuit is for adjusting the electric current of described LED light source; Final method ends at step 104.Adopt this method to be reduced by sampled value repeatedly goes to be worth most to be averaged to process the frequency of adjusting the LED light source electric current, reach not affect on the basis that the LED light source constant current drives and reduced the up and down fluctuation of current value around set point, thereby reduced small flicker and the shake of LED light source light intensity.
In the flow chart of the second preferred embodiment of the LED light source debounce flowing control method of the present invention shown in Fig. 2, step S1 in described LED light source debounce flowing control method starts from step 200, arrive subsequently next step 201, the output voltage values of the described LED light source of sampling, obtain the first sampled value; Arrive subsequently next step 202, the output voltage values through the described LED light source of time sampling of described sampling time interval, obtain the second sampled value; Arrive subsequently next step 203, more described the first sampled value and described the second sampled value, save as maximum sampled value wherein greatlyr, less save as minimum sampled value, equal described the first sampled value is saved as to described maximum sampled value and described minimum sampled value simultaneously, described the first sampled value and described the second sampled value addition save as accumulated value; Arrive subsequently next step 204, through the output voltage values of the described LED light source of time sampling of described sampling time interval, by its assignment to the subsequent sampling value; Arrive subsequently next step 205, more described subsequent sampling value and described maximum sampled value, save as maximum sampled value wherein greatlyr; More described subsequent sampling value and described minimum sampled value, wherein less save as minimum sampled value; Described subsequent sampling value is added up in described accumulated value and upgrades and preserve; Arrive subsequently next step 206, the number of times that repeating step 204 and 205 is set; Arrive subsequently next step 207, average sample value=(accumulated value-maximum sampled value-minimum sampled value)/(sampling number-2), final method ends at step 208.In order to obtain in time average sample value accurately, all carrying out the calculating of maximum sampled value, minimum sampled value and accumulated value in sampling each time, can directly according to maximum sampled value, minimum sampled value, accumulated value and sampling number, average in time the calculating of sampled value like this after the sampling through set point number.Having removed maximum sampled value and minimum sampled value can prevent from departing from due to the sampling numerical value that voltage fluctuation occurs the phenomenon that actual value is larger to greatest extent; guaranteed the accuracy of average sample value; make more to approach set point according to the electric current of the LED light source after the adjustment of average sample value; certainly realize a plurality of sampled values are gone to be worth most to be averaged to process all belonging in protection scope of the present invention with the additive method that obtains the average sample value, going to be worth most can be to remove one or several maximum or minimum value.
In the flow chart of the 3rd preferred embodiment of the LED light source debounce flowing control method of the present invention shown in Fig. 3, described LED light source debounce flowing control method starts from step 300, arrive subsequently next step 301, set described sampling time interval, described set point and described sampling number; Arrive subsequently next step 302, described a plurality of sampled values gone to be worth most be averaged processing, obtain the average sample value; Arrive subsequently next step 303, by described average sample value and set point relatively, obtain comparative result; Arrive subsequently next step 304, the duty ratio of definite pwm circuit according to described comparative result, described pwm circuit is for adjusting the electric current of described LED light source; Final method ends at step 305.Setting by sampling time interval, set point and sampling number can reach the best moving effect of debounce.
Preferred embodiment as LED light source debounce flowing control method of the present invention, also comprise in described step S1, and the output voltage values that sampling is obtained carries out analog digital and is converted to sampled value.Described step S3 comprises: when described average sample value is greater than described set point, reduce the electric current of described LED light source by the duty ratio of controlling described pwm circuit; When described average sample value is less than described set point, increase the electric current of described LED light source by the duty ratio of controlling described pwm circuit.Magnitude of voltage is converted to data volume through analog-to-digital conversion by analog quantity and makes comparative result more accurate.Carry out the electric current adjustment of LED light source by pwm circuit, adjust precision high, so just can maintain current value constant on set point, the constant current that has also just formed LED drives, and effectively removes the small flicker of LED brightness, the phenomenon of shake simultaneously.
The invention still further relates to the moving control circuit of a kind of LED light source debounce, in the structural representation of the first preferred embodiment of the moving control circuit of LED light source debounce of the present invention as shown in Figure 4, the moving control circuit of described LED light source debounce comprises sampling module 1, comparison module 2 and adjusting module 3, sampling module 1 is for repeatedly the sample output voltage values of LED light source of the sampling time interval according to predetermined, obtain a plurality of sampled values, described a plurality of sampled values are gone to be worth most be averaged processing, obtained the average sample value; Comparison module 2, for described average sample value and set point are compared, obtains comparative result; Adjusting module 3 is for the duty ratio of the pwm circuit definite according to described comparative result, and described pwm circuit is for adjusting the electric current of described LED light source.The sampling module 1 that adopts this circuit is reduced by sampled value repeatedly goes to be worth most to be averaged to process the frequency of adjusting the LED light source electric current, reach not affect on the basis that the LED light source constant current drives and reduced the up and down fluctuation of current value around set point, thereby reduced small flicker and the shake of LED light source light intensity.
In the structural representation of the second preferred embodiment of the moving control circuit of LED light source debounce of the present invention as shown in Figure 5, sampling module 1 comprises sampling unit 11, is worth judging unit 12 most, cumulative unit 13 and output unit 14, sampling unit 11, for the output voltage values of the described LED light source of sampling according to described sampling time interval and sampling number, obtains sampled value; Be worth most maximum and the minimum value of judging unit 12 for the calculating sampling value; Cumulative unit 13 is for calculating the accumulated value of all sampled values; Output unit 14 is for exporting described average sample value according to average sample value=(accumulated value-maximum sampled value-minimum sampled value)/(sampling number-2).In order to obtain in time average sample value accurately, be worth most judging unit 12 and cumulative unit 13 all carries out the calculating of maximum sampled value, minimum sampled value and accumulated value in sampling each time, after the sampling through sampling unit 11 set point numbers, output unit 14 can directly average the calculating of sampled value in time according to maximum sampled value, minimum sampled value, accumulated value and sampling number like this.Having removed maximum sampled value and minimum sampled value can prevent from departing from due to the sampling numerical value that voltage fluctuation occurs the phenomenon that actual value is larger to greatest extent; guaranteed the accuracy of average sample value; make more to approach set point according to the electric current of the LED light source after the adjustment of average sample value; certainly realize a plurality of sampled values are gone to be worth most to be averaged to process all belonging in protection scope of the present invention with the additive method that obtains the average sample value, going to be worth most can be to remove one or several maximum or minimum value.
In the structural representation of the 3rd preferred embodiment of the moving control circuit of LED light source debounce of the present invention as shown in Figure 6, the moving control circuit of LED light source debounce also comprises setting module 4, and setting module 4 is for setting described sampling time interval, described set point and described sampling number.The setting of sampling time interval, set point and sampling number by setting module 4 can reach the best moving effect of debounce.
In the structural representation of the 4th preferred embodiment of the moving control circuit of LED light source debounce of the present invention as shown in Figure 7, sampling module 1 also comprises AD conversion unit 15, and AD conversion unit 15 is carried out analog digital for the output voltage values that sampling is obtained and is converted to sampled value.Magnitude of voltage is converted to data volume through AD conversion unit 15 by analog quantity and makes comparative result more accurate.
As the preferred embodiment of the moving control circuit of LED light source debounce of the present invention, adjusting module 3, for when described average sample value is greater than described set point, reduces the electric current of described LED light source by the duty ratio of controlling described pwm circuit; When described average sample value is less than described set point, increase the electric current of described LED light source by the duty ratio of controlling described pwm circuit.Carry out the electric current adjustment of LED light source by pwm circuit, adjust precision high, so just can maintain current value constant on set point, the constant current that has also just formed LED drives, and effectively removes the small flicker of LED brightness, the phenomenon of shake simultaneously.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure transformation that utilizes specification of the present invention and accompanying drawing content to do, or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.
Claims (8)
1. a LED light source debounce flowing control method, is characterized in that, comprises step:
S1, according to repeatedly the sample output voltage values of LED light source of predetermined sampling time interval, obtain a plurality of sampled values; Described a plurality of sampled values are gone to be worth most be averaged processing, obtained the average sample value;
S2, by described average sample value and set point relatively, obtain comparative result;
S3, according to described comparative result the duty ratio of definite pwm circuit, described pwm circuit is for adjusting the electric current of described LED light source;
Described step S1 further comprises:
The output voltage values of S11, the described LED light source of sampling, obtain the first sampled value;
The output voltage values of the described LED light source of time sampling of S12, the described sampling time interval of process, obtain the second sampled value;
S13, more described the first sampled value and described the second sampled value, save as maximum sampled value wherein greatlyr, less save as minimum sampled value, equal described the first sampled value is saved as to described maximum sampled value and described minimum sampled value simultaneously, described the first sampled value and described the second sampled value addition save as accumulated value;
S14, through the output voltage values of the described LED light source of time sampling of described sampling time interval, by its assignment to the subsequent sampling value;
S15, more described subsequent sampling value and described maximum sampled value, save as maximum sampled value wherein greatlyr; More described subsequent sampling value and described minimum sampled value, wherein less save as minimum sampled value; Described subsequent sampling value is added up in described accumulated value and upgrades and preserve;
The number of times that S16, repeating step S14 and S15 set;
S17, average sample value=(accumulated value-maximum sampled value-minimum sampled value)/(sampling number-2).
2. LED light source debounce flowing control method according to claim 1, is characterized in that, comprises step before described step S1:
S0, set described sampling time interval, described set point and described sampling number.
3. LED light source debounce flowing control method according to claim 1, is characterized in that, in described step S1, also comprises, the output voltage values that sampling is obtained carries out analog digital and is converted to sampled value.
4. LED light source debounce flowing control method according to claim 1, is characterized in that, described step S3 comprises: when described average sample value is greater than described set point, reduce the electric current of described LED light source by the duty ratio of controlling described pwm circuit; When described average sample value is less than described set point, increase the electric current of described LED light source by the duty ratio of controlling described pwm circuit.
5. the moving control circuit of LED light source debounce, is characterized in that, comprising:
Sampling module (1): for repeatedly the sample output voltage values of LED light source of the sampling time interval according to predetermined, obtain a plurality of sampled values; Described a plurality of sampled values are gone to be worth most be averaged processing, obtained the average sample value;
Comparison module (2): for described average sample value and set point are compared, obtain comparative result; And
Adjusting module (3): for the duty ratio of the pwm circuit definite according to described comparative result, described pwm circuit is for adjusting the electric current of described LED light source;
Described sampling module (1) further comprises:
Sampling unit (11): the output voltage values for the described LED light source of sampling according to described sampling time interval and sampling number obtains sampled value;
Be worth most judging unit (12): for maximum and the minimum value of calculating sampling value;
Cumulative unit (13): for calculating the accumulated value of all sampled values; And
Output unit (14): for according to average sample value=(accumulated value-maximum sampled value-minimum sampled value)/(sampling number-2), exporting described average sample value.
6. the moving control circuit of LED light source debounce according to claim 5, is characterized in that, the moving control circuit of described LED light source debounce also comprises:
Setting module (4): for setting described sampling time interval, described set point and described sampling number.
7. the moving control circuit of LED light source debounce according to claim 5, is characterized in that, described sampling module (1) also comprises:
AD conversion unit (15): carry out analog digital for the output voltage values that sampling is obtained and be converted to sampled value.
8. the moving control circuit of LED light source debounce according to claim 5, is characterized in that, described adjusting module (3), for when described average sample value is greater than described set point, reduces the electric current of described LED light source by the duty ratio of controlling described pwm circuit; When described average sample value is less than described set point, increase the electric current of described LED light source by the duty ratio of controlling described pwm circuit.
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| CN103118468B (en) * | 2013-02-19 | 2015-10-07 | 从兴技术有限公司 | A kind of LED street lamp long-range control method and device |
| CN107124802B (en) * | 2017-04-28 | 2019-06-11 | 惠州华阳通用电子有限公司 | A method of improving vehicle device dim signal stability |
| CN113057754B (en) * | 2018-07-03 | 2022-08-12 | 深圳素士科技股份有限公司 | Output control method and system of tooth flushing device |
| CN110022630B (en) * | 2019-04-17 | 2020-05-12 | 北京华大九天软件有限公司 | PWM flicker-free digital dimming device and method |
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| CN101237184A (en) * | 2008-02-28 | 2008-08-06 | 上海交通大学 | Sampling feedback control circuit of output-adjustable switch power and is control method |
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