CN102487568A - De-jittering control method for LED light source and circuit thereof - Google Patents
De-jittering control method for LED light source and circuit thereof Download PDFInfo
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- CN102487568A CN102487568A CN2010105752196A CN201010575219A CN102487568A CN 102487568 A CN102487568 A CN 102487568A CN 2010105752196 A CN2010105752196 A CN 2010105752196A CN 201010575219 A CN201010575219 A CN 201010575219A CN 102487568 A CN102487568 A CN 102487568A
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Abstract
The invention relates to a de-jittering control method for an LED light source. The method comprises the following steps that: S1, multi-time sampling is carried out on output voltage values of an LED light source according to a predetermined sampling time interval so as to obtain a plurality of sampling values; variation value removing and averaging processing is carried out on the plurality of sampling values so as to obtain an average sampling value; S2, the average sampling value and a set value are compared to obtain a comparison result; and S3, a duty ratio of a PWM circuit is determined according to the comparison result, wherein the PWM circuit is used for adjusting currents of the LED light source. In addition, the invention also relates to a de-jittering control circuit for an LED light source. According to the de-jittering control method for an LED light source and a circuit thereof in the invention, variation value removing and averaging processing is carried out on multi-time sampling values, so that frequency for adjusting currents of an LED light source is reduced; therefore, up-and-down fluctuation of current values around a set value can be reduced on the basis that constant current drive of the LED light source is not influenced, so that tiny flashing and slight jittering of light intensity of the LED light source can be reduced.
Description
Technical field
The present invention relates to circuit control field, more particularly, relate to a kind of led light source and remove vibration control method and circuit.
Background technology
At present; If use the lower singlechip chip of working clock frequency to realize the constant current function of constant-current source, can produce current value can not be stabilized on the set point, thereby the fluctuation of current value can occur; The fluctuation of current value shows on the result of use; For when led light source is worked, the situation of shake appears in the light of led light source, influences the comfort of led light source greatly.
Summary of the invention
The technical problem that the present invention will solve is; To the above-mentioned constant-current source of prior art because the defective of the light of the led light source that the fluctuation of current value causes shake; Provide a kind of and can under the prerequisite of the structure that does not change hardware, prevent that effectively the led light source of led light source shake from removing vibration control method and circuit.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of led light source and remove vibration 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; Going the sudden change value to make even said a plurality of sampled values all handles, obtains the average sample value; S2, with said average sample value and set point relatively obtains comparative result; The duty ratio of S3, the pwm circuit confirmed according to said comparative result, said pwm circuit is used to adjust the electric current of said led light source.
Go in the vibration control method at led light source of the present invention, said step S1 comprises step: the output voltage values of S11, the said led light source of sampling obtains first sampled value; The output voltage values of the said led light source of time sampling of S12, the said sampling time interval of process obtains second sampled value; S13, more said first sampled value and setting maximum greater than said setting maximum, are then given said first sampled value with said setting maximum assignment like first sampled value; More said second sampled value and said setting maximum greater than said setting maximum, are then given said second sampled value with said setting maximum assignment like second sampled value; S14, more said first sampled value and said second sampled value; Wherein bigger save as maximum sampled value; Less save as minimum sampled value; Equal then said first sampled value is saved as said maximum sampled value and said minimum sampled value simultaneously, said first sampled value and the said second sampled value addition save as accumulated value; S15, through the output voltage values of the said led light source of time sampling of said sampling time interval, with its assignment to the subsequent sampling value; S16, more said subsequent sampling value and said setting maximum greater than said setting maximum, are then given said subsequent sampling value with said setting maximum assignment like the subsequent sampling value; S17, more said subsequent sampling value and said maximum sampled value wherein bigger save as maximum sampled value; More said subsequent sampling value and said minimum sampled value wherein less save as minimum sampled value; Said subsequent sampling value is added up in said accumulated value and renewal preservation; The number of times that S18, repeating step S15, S16, S17 set; S19, average sample value=(accumulated value-maximum sampled value-minimum sampled value)/(sampling number-2).
Go in the vibration control method at led light source of the present invention, comprise step: S0 before the said step S1, set said sampling time interval, said set point, said setting maximum and said sampling number.
Go in the vibration control method at led light source of the present invention, also comprise among the said step S1, the output voltage values that sampling is obtained carries out analog digital and is converted to sampled value.
Go in the vibration control method at led light source of the present invention, said step S3 comprises: when said average sample value during greater than said set point, reduce the electric current of said led light source through the duty ratio of controlling said pwm circuit; When said average sample value during, increase the electric current of said led light source through the duty ratio of controlling said pwm circuit less than said set point.
The present invention also constructs a kind of led light source and removes to shake control circuit, comprising sampling module: be used for obtaining a plurality of sampled values according to repeatedly the sample output voltage values of led light source of predetermined sampling time interval; Going the sudden change value to make even said a plurality of sampled values all handles, obtains the average sample value; Comparison module: be used for said average sample value and set point are compared, obtain comparative result; And adjusting module: be used for the duty ratio according to the definite pwm circuit of said comparative result, said pwm circuit is used to adjust the electric current of said led light source.
Go to shake in the control circuit at led light source of the present invention, said sampling module comprises: sampling unit: be used for obtaining sampled value according to the sample output voltage values of said led light source of said sampling time interval and sampling number; Remove the value cell that suddenlys change: be used for more said sampled value and set maximum, greater than said setting maximum, then give said sampled value with said setting maximum assignment like said sampled value; Be worth most judging unit: the maximum and the minimum value that are used for calculating said sampled value; The unit adds up: the accumulated value that is used to calculate all sampled values; And output unit: be used for according to average sample value=said average sample value of (accumulated value-maximum sampled value-minimum sampled value)/(sampling number-2) output.
Go to shake in the control circuit at led light source of the present invention, said led light source removes to shake control circuit and also comprises: setting module: be used to set said sampling time interval, said set point, said setting maximum and said sampling number.
Go to shake in the control circuit at led light source of the present invention, said sampling module also comprises: AD conversion unit: the output voltage values that is used for that sampling is obtained carries out analog digital and is converted to sampled value.
Go to shake in the control circuit at led light source of the present invention, said adjusting module is used for reducing the electric current of said led light source through the duty ratio of controlling said pwm circuit when said average sample value during greater than said set point; When said average sample value during, increase the electric current of said led light source through the duty ratio of controlling said pwm circuit less than said set point.
The led light source of embodiment of the present invention removes to shake control circuit; Has following beneficial effect: can all handle the frequency that reduces adjustment led light source electric current through sampled value repeatedly being gone the sudden change value make even; Reach and reduced the up and down fluctuation of current value around set point on the basis that does not influence the led light source constant-current driving, thereby reduced the small flicker and the shake of led light source light intensity.
Setting through sampling time interval, set point, setting maximum and sampling number can reach the best judder of going.Make comparative result more accurate through analog-to-digital conversion magnitude of voltage.Carry out the electric current adjustment of led light source through pwm circuit, the adjustment precision is high.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the flow chart that led light source of the present invention removes first preferred embodiment of vibration control method;
Fig. 2 is the flow chart that led light source of the present invention removes second preferred embodiment of vibration control method;
Fig. 3 is the flow chart that led light source of the present invention removes the 3rd preferred embodiment of vibration control method;
Fig. 4 is the structural representation that led light source of the present invention removes to shake first preferred embodiment of control circuit;
Fig. 5 is the structural representation that led light source of the present invention removes to shake the 3rd preferred embodiment of control circuit;
Fig. 6 is the structural representation that led light source of the present invention removes to shake the 3rd preferred embodiment of control circuit;
Fig. 7 is the structural representation that led light source of the present invention removes to shake the 4th preferred embodiment of control circuit.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
We know, because the voltage waveform of actual samples is non-linear from microcosmic point, just say that also sampled value is suddenly big or suddenly small, so will cause the instability of current value.When the single-chip microcomputer working clock frequency is low, if each sampled value is all made comparison, and the duty ratio of regulating PWM, current value then can occur and fluctuate up and down in set point, be reflected on the led circuit, be exactly small flicker, the shake of brightness.Adopt led light source of the present invention to remove vibration control method and circuit for addressing this problem; All handle the frequency that reduces adjustment led light source electric current through sampled value repeatedly being gone the sudden change value make even; Reach and reduced the up and down fluctuation of current value around set point on the basis that does not influence the led light source constant-current driving, thereby reduced the small flicker and the shake of led light source light intensity.
Go in the flow chart of first preferred embodiment of vibration control method at led light source of the present invention shown in Figure 1; Said led light source goes vibration control method to start 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; Going the sudden change value to make even said a plurality of sampled values all handles, obtains the average sample value; Arrive subsequently next step 102, with said average sample value and set point relatively, obtain comparative result; Arrive subsequently next step 103, the duty ratio of the pwm circuit of confirming according to said comparative result, said pwm circuit is used to adjust the electric current of said led light source; Final method ends at step 104.Adopt this method all to handle the frequency that reduces adjustment led light source electric current through going the sudden change value to make even to sampled value repeatedly; Reach and reduced the up and down fluctuation of current value around set point on the basis that does not influence the led light source constant-current driving, thereby reduced the small flicker and the shake of led light source light intensity.
Go in the flow chart of second preferred embodiment of vibration control method at led light source of the present invention shown in Figure 2; Said led light source goes the step S1 in the vibration control method to start from step 200; Arrive subsequently next step 201, the output voltage values of the said led light source of sampling obtains first sampled value; Arrive subsequently next step 202, the output voltage values through the said led light source of time sampling of said sampling time interval obtains second sampled value; Arrive subsequently next step 203, more said first sampled value with set maximum, greater than said setting maximum, then give said first sampled value like said first sampled value with said setting maximum assignment; More said second sampled value and said setting maximum greater than said setting maximum, are then given said second sampled value with said setting maximum assignment like said second sampled value; Arrive subsequently next step 204; More said first sampled value and said second sampled value; Wherein bigger save as maximum sampled value; Less save as minimum sampled value, equal then said first sampled value is saved as said maximum sampled value and said minimum sampled value simultaneously, said first sampled value and the said second sampled value addition save as accumulated value; Arrive subsequently next step 205, through the output voltage values of the said led light source of time sampling of said sampling time interval, with its assignment to the subsequent sampling value; Arrive subsequently next step 206, more said subsequent sampling value and said setting maximum greater than said setting maximum, are then given said subsequent sampling value with said setting maximum assignment like the subsequent sampling value; Arrive subsequently next step 207, more said subsequent sampling value and said maximum sampled value wherein bigger save as maximum sampled value; More said subsequent sampling value and said minimum sampled value wherein less save as minimum sampled value; Said subsequent sampling value is added up in said accumulated value and renewal preservation; Arrive subsequently next step 208, the number of times that repeating step 205,206 and 207 is set; Arrive subsequently next step 209, average sample value=(accumulated value-maximum sampled value-minimum sampled value)/(sampling number-2).Final method ends at step 210.In order in time to obtain average sample value accurately; Set the setting maximum of what a expectation in advance; And it is abnormal sampled value that acquiescence is set peaked sampled value greater than this, thereby this numerical value is handled (for example this value is set to set maximum).In sampling each time, all carry out the calculating of maximum sampled value, minimum sampled value and accumulated value, after the process sampling of set point number, can directly in time average the calculating of sampled value like this according to maximum sampled value, minimum sampled value, accumulated value and sampling number.Having removed maximum sampled value and minimum sampled value can prevent to depart from the bigger phenomenon of actual value owing to the sampling numerical value that voltage fluctuation occurs to greatest extent; Guaranteed the accuracy of average sample value; Make the electric current that is worth adjusted led light source according to average sample more near set point; Certainly realize all belonging in protection scope of the present invention to the additive method that a plurality of sampled values go the sudden change value to make even all to handle to obtain the average sample value; Going to be worth most can be to remove one or several maximum or minimum value, and the sudden change value is set to the numerical value (as being set to set point etc.) that the tester sees fit and also should belongs within protection scope of the present invention.
Go in the flow chart of the 3rd preferred embodiment of vibration control method at led light source of the present invention shown in Figure 3; Said led light source goes vibration control method to start from step 300; Arrive subsequently next step 301, set said sampling time interval, said set point, said setting maximum and said sampling number; Arrive subsequently next step 302, go the sudden change value to make even all said a plurality of sampled values and handle, obtain the average sample value; Arrive subsequently next step 303, with said average sample value and set point relatively, obtain comparative result; Arrive subsequently next step 304, the duty ratio of the pwm circuit of confirming according to said comparative result, said pwm circuit is used to adjust the electric current of said led light source; Final method ends at step 305.Setting through sampling time interval, set point, setting maximum and sampling number can reach the best judder of going.
Remove the preferred embodiment of vibration control method as led light source of the present invention, also comprise among the said step S1, the output voltage values that sampling is obtained carries out analog digital and is converted to sampled value.Said step S3 comprises: when said average sample value during greater than said set point, reduce the electric current of said led light source through the duty ratio of controlling said pwm circuit; When said average sample value during, increase the electric current of said led light source through the duty ratio of controlling said pwm circuit less than said set point.Magnitude of voltage converts analog quantity into data volume through analog-to-digital conversion makes comparative result more accurate.Carry out the electric current adjustment of led light source through pwm circuit, the adjustment precision is high, and it is constant on set point so just can to keep current value, has also just formed the constant-current driving of LED, effectively removes the small flicker of LED brightness, the phenomenon of shake simultaneously.
The invention still further relates to a kind of led light source and remove to shake control circuit; Go to shake in the structural representation of first preferred embodiment of control circuit at led light source of the present invention as shown in Figure 4; Said led light source removes to shake control circuit and comprises sampling module 1, comparison module 2 and adjusting module 3; Sampling module 1 is used for according to repeatedly the sample output voltage values of led light source of predetermined sampling time interval; Obtain a plurality of sampled values, go the sudden change value to make even said a plurality of sampled values and all handle, obtain the average sample value; Comparison module 2 is used for said average sample value and set point are compared, and obtains comparative result; Adjusting module 3 is used for the duty ratio according to the definite pwm circuit of said comparative result, and said pwm circuit is used to adjust the electric current of said led light source.The sampling module 1 that adopts this circuit is all handled the frequency that reduces adjustment led light source electric current through going the sudden change value to make even to sampled value repeatedly; Reach and reduced the up and down fluctuation of current value around set point on the basis that does not influence the led light source constant-current driving, thereby reduced the small flicker and the shake of led light source light intensity.
Go to shake in the structural representation of second preferred embodiment of control circuit at led light source of the present invention as shown in Figure 5; Sampling module 1 comprises sampling unit 11, the value cell 12 that goes to suddenly change, be worth judging unit 13 most, unit 14 and output unit 15 add up; Sampling unit 11 is used for obtaining sampled value according to the sample output voltage values of said led light source of said sampling time interval and sampling number; The value cell 12 that goes to suddenly change is used for more said sampled value and sets maximum, greater than said setting maximum, then gives said sampled value with said setting maximum assignment like said sampled value; Be worth most judging unit 13 and be used for the maximum and the minimum value of calculating sampling value; The unit 14 that adds up is used to calculate the accumulated value of all sampled values; Output unit 15 is used for according to average sample value=said average sample value of (accumulated value-maximum sampled value-minimum sampled value)/(sampling number-2) output.In order in time to obtain average sample value accurately; Set in advance the setting maximum of what a expectation, and acquiescence to set peaked sampled value greater than this be abnormal sampled value, thereby 12 pairs of these numerical value of value cell that go to suddenly change are handled; For example, this value is set to set maximum.In sampling each time, be worth judging unit 13 most and all carry out the calculating of maximum sampled value, minimum sampled value and accumulated value with the unit 14 that adds up, output unit 15 can directly in time average the calculating of sampled value according to maximum sampled value, minimum sampled value, accumulated value and sampling number after through the sampling of sampling unit 11 set point numbers like this.Having removed maximum sampled value and minimum sampled value can prevent to depart from the bigger phenomenon of actual value owing to the sampling numerical value that voltage fluctuation occurs to greatest extent; Guaranteed the accuracy of average sample value; Make the electric current that is worth adjusted led light source according to average sample more near set point, realize that certainly going the sudden change value to make even to a plurality of sampled values all handles, all belong 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; The sudden change value is set to the numerical value that the tester sees fit, as, be set to set point etc. and also should belong within protection scope of the present invention.
Go to shake in the structural representation of the 3rd preferred embodiment of control circuit at led light source of the present invention as shown in Figure 6; Led light source removes to shake control circuit and also comprises setting module 4, and setting module 4 is used to set said sampling time interval, said set point, said setting maximum and said sampling number.The setting of sampling time interval, set point, setting maximum and sampling number through setting module 4 can reach the best judder of going.
Go to shake in the structural representation of the 4th preferred embodiment of control circuit at led light source of the present invention as shown in Figure 7; Sampling module 1 also comprises AD conversion unit 16, and the output voltage values that AD conversion unit 16 is used for that sampling is obtained carries out analog digital and is converted to sampled value.Magnitude of voltage converts analog quantity into data volume through AD conversion unit 16 makes comparative result more accurate.
Remove to shake the preferred embodiment of control circuit as led light source of the present invention, adjusting module 3 is used for reducing the electric current of said led light source through the duty ratio of controlling said pwm circuit when said average sample value during greater than said set point; When said average sample value during, increase the electric current of said led light source through the duty ratio of controlling said pwm circuit less than said set point.Carry out the electric current adjustment of led light source through pwm circuit, the adjustment precision is high, and it is constant on set point so just can to keep current value, has also just formed the constant-current driving of LED, effectively removes the small flicker of LED brightness, the phenomenon of shake simultaneously.
The above is merely embodiments of the invention; Be not so limit claim of the present invention; Every equivalent structure transformation that utilizes specification of the present invention and accompanying drawing content to be done, or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. a led light source removes vibration control method, it 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; Going the sudden change value to make even said a plurality of sampled values all handles, obtains the average sample value;
S2, with said average sample value and set point relatively obtains comparative result;
The duty ratio of S3, the pwm circuit confirmed according to said comparative result, said pwm circuit is used to adjust the electric current of said led light source.
2. light source according to claim 1 removes vibration control method, it is characterized in that, said step S1 comprises step:
The output voltage values of S11, the said led light source of sampling obtains first sampled value;
The output voltage values of the said led light source of time sampling of S12, the said sampling time interval of process obtains second sampled value;
S13, more said first sampled value and setting maximum greater than said setting maximum, are then given said first sampled value with said setting maximum assignment like said first sampled value; More said second sampled value and said setting maximum greater than said setting maximum, are then given said second sampled value with said setting maximum assignment like said second sampled value;
S14, more said first sampled value and said second sampled value; Wherein bigger save as maximum sampled value; Less save as minimum sampled value; Equal then said first sampled value is saved as said maximum sampled value and said minimum sampled value simultaneously, said first sampled value and the said second sampled value addition save as accumulated value;
S15, through the output voltage values of the said led light source of time sampling of said sampling time interval, with its assignment to the subsequent sampling value;
S16, more said subsequent sampling value and said setting maximum greater than said setting maximum, are then given said subsequent sampling value with said setting maximum assignment like the subsequent sampling value;
S17, more said subsequent sampling value and said maximum sampled value wherein bigger save as maximum sampled value; More said subsequent sampling value and said minimum sampled value wherein less save as minimum sampled value; Said subsequent sampling value is added up in said accumulated value and renewal preservation;
The number of times that S18, repeating step S15, S16, S17 set;
S19, average sample value=(accumulated value-maximum sampled value-minimum sampled value)/(sampling number-2).
3. light source according to claim 2 removes vibration control method, it is characterized in that, comprises step before the said step S1:
S0, set said sampling time interval, said set point, said setting maximum and said sampling number.
4. light source according to claim 1 removes vibration control method, it is characterized in that, also comprises among the said step S1, and the output voltage values that sampling is obtained carries out analog digital and is converted to sampled value.
5. light source according to claim 1 removes vibration control method, it is characterized in that, said step S3 comprises: when said average sample value during greater than said set point, reduce the electric current of said led light source through the duty ratio of controlling said pwm circuit; When said average sample value during, increase the electric current of said led light source through the duty ratio of controlling said pwm circuit less than said set point.
6. a led light source removes to shake control circuit, it is characterized in that, comprising:
Sampling module (1): be used for obtaining a plurality of sampled values according to repeatedly the sample output voltage values of led light source of predetermined sampling time interval; Going the sudden change value to make even said a plurality of sampled values all handles, obtains the average sample value;
Comparison module (2): be used for said average sample value and set point are compared, obtain comparative result; And
Adjusting module (3): be used for the duty ratio according to the definite pwm circuit of said comparative result, said pwm circuit is used to adjust the electric current of said led light source.
7. led light source according to claim 6 removes to shake control circuit, it is characterized in that, said sampling module (1) comprising:
Sampling unit (11): be used for obtaining sampled value according to the sample output voltage values of said led light source of said sampling time interval and sampling number;
Value cell (12) goes to suddenly change: be used for more said sampled value and set maximum, greater than said setting maximum, then give said sampled value with said setting maximum assignment like said sampled value;
Be worth most judging unit (13): the maximum and the minimum value that are used for calculating said sampled value;
Unit (14) adds up: the accumulated value that is used to calculate all sampled values; And
Output unit (15): be used for according to average sample value=said average sample value of (accumulated value-maximum sampled value-minimum sampled value)/(sampling number-2) output.
8. led light source according to claim 7 removes to shake control circuit, it is characterized in that, said led light source removes to shake control circuit and also comprises:
Setting module (4): be used to set said sampling time interval, said set point, said setting maximum and said sampling number.
9. led light source according to claim 6 removes to shake control circuit, it is characterized in that, said sampling module (1) also comprises:
AD conversion unit (16): the output voltage values that is used for that sampling is obtained carries out analog digital and is converted to sampled value.
10. led light source according to claim 6 removes to shake control circuit, it is characterized in that, said adjusting module (3) is used for reducing the electric current of said led light source through the duty ratio of controlling said pwm circuit when said average sample value during greater than said set point; When said average sample value during, increase the electric current of said led light source through the duty ratio of controlling said pwm circuit less than said set point.
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| CN109488916A (en) * | 2018-11-19 | 2019-03-19 | 李亚焕 | A kind of LED of anti-flashing |
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