CN109379804A - A kind of LED light light adjusting system and light-dimming method - Google Patents
A kind of LED light light adjusting system and light-dimming method Download PDFInfo
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- CN109379804A CN109379804A CN201811195711.3A CN201811195711A CN109379804A CN 109379804 A CN109379804 A CN 109379804A CN 201811195711 A CN201811195711 A CN 201811195711A CN 109379804 A CN109379804 A CN 109379804A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
Abstract
The invention discloses a kind of LED light light adjusting system and light-dimming method, including sequentially connected light-adjusting module, constant-current driven module and LED light display module, the light-adjusting module includes index light modulation engine, linearity light adjusting device, multiplier, sigma-delta modulator；The light-adjusting module is by converting brightness value digital signal for the intensity gear number of input and light modulation numerical value, and brightness value digital signal is switched into PDM signal, the light-adjusting module output PDM signal driving constant-current driven module exports corresponding electric current, so that LED light display module be driven to work.The configuration of the present invention is simple, it is at low cost, it realizes by using each structure in light-adjusting module using PDM signal as driving signal, make that the adjustment process of LED light brightness and color is natural, change procedure soft the phenomenon that avoiding low frequency flicker, the stability and anti-interference for improving driving signal ensure that LED light brightness and color adjustment process can smoothly complete.
Description
Technical field
The present invention relates to light emitting diode (Low Emitting Diode, LED) lighting area, especially a kind of LED light
Light adjusting system and light-dimming method.
Background technique
Rgb color mode is a kind of color standard of industry, is by logical to red (R), green (G), blue (B) three colors
To obtain miscellaneous color, RGB is to represent red, green, blue three for the variation in road and their mutual superpositions
The color in channel, this standard almost include all colours that human eyesight can perceive, and are current with most wide color
One of system.
Tri- color of RGB alarm LED light is an important component on medical monitoring machine, the light modulation of the LED light of tri- color of RGB alarm at present
For mode mainly using constant current control method and the pwm signal control of simulation, it is relatively dull that there are color changes；Single color it is bright
It is not smooth enough to spend LED light color change in adjustment process；The driving signal anti-interference of output is poor；Low-frequency current causes flashing existing
As the problems such as.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of LED light light adjusting system and light-dimming method, pass through tune
The intensity value and light modulation value for saving LED light, keep LED light smoothly varying in adjustment process.
The technical solution adopted by the present invention to solve the technical problems is: a kind of LED light light adjusting system, including is sequentially connected
Light-adjusting module, constant-current driven module and LED light display module, it is characterised in that: the light-adjusting module include index light modulation draw
It holds up, linearity light adjusting device, multiplier, sigma-delta modulator；
The index light modulation engine is used to convert intensity value digital signal for the digital signal of received intensity gear number, and
Intensity value digital signal is issued into multiplier；
The linearity light adjusting device is used to convert received light modulation numeric number signal to light modulation value digital signal, and will adjust
Light value digital signal issues multiplier；
The multiplier is used to that received intensity value to be multiplied to obtain with light modulation value digital signal brightness value number letter
Number, and brightness value digital signal is sent to sigma-delta modulator；
The sigma-delta modulator is used to switch to institute's received brightness value digital signal PDM signal, and by the PDM signal
It is sent to constant-current driven module；
The constant-current driven module is according to the driving LED light display module work of PDM signal instruction.
Further, the light-adjusting module further includes house dog, and the house dog is connected on sigma-delta modulator and constant current driving
Between module, whether the PDM signal frequency for monitoring sigma-delta modulator output is lower than preset value fa；If being lower than fa, house dog
The PDM signal frequency that sigma-delta modulator exports then is risen above to or is equal to fa。
Further, the light-adjusting module further includes packing device, and the packing device is connected on sigma-delta modulator and constant current driving
Between module, whether the PDM signal that the packing device is used to monitor sigma-delta modulator output is higher than preset value fb；If being higher than fb,
Packing device, which then merges the PDM signal that sigma-delta modulator exports, makes its frequency be reduced to less than or equal to fb。
A kind of LED light light-dimming method is applied to LED light light adjusting system, and LED light light adjusting system includes sequentially connected light modulation
Module, constant-current driven module and LED light display module, comprising the following steps:
S1, respectively input intensity gear number and light modulation numerical value；
S2, the intensity gear number of input is converted to by intensity value digital signal using exponentiation algorithm；It will be defeated using linear algorithm
The light modulation numerical value conversion entered is light modulation value digital signal；
S3, intensity value digital signal is multiplied to obtain brightness value digital signal with light modulation value digital signal；
S4, brightness value digital signal is converted into PDM signal；
S5, constant-current driven module is sent to using PDM signal as driving signal；
S6, constant-current driven module are according to the driving LED light display module work of PDM signal instruction.
Further, the calculation formula of exponentiation algorithm is in the step 2* 100%, wherein B is output
Intensity value digital signal, A are the intensity gear number of input, k1And k2For the regular coefficients of setting, exponentiation algorithm is based on index light modulation and draws
Hold up completion.
Further, the calculation formula of linear algorithm is in the step 2Wherein E is
The light modulation value digital signal of output, C are current light modulation value, and D is the light modulation value of input, k3Regular coefficients, fcFor system work
Clock frequency, t are the dimming time of default light modulation variation, and linear algorithm is completed based on linearity light adjusting device.
Further, further comprising the steps of before entering step S5:
Whether the PDM signal frequency that S41, judgment step S4 are exported is lower than preset value fa, entered step if being lower than
S42 enters step S5 if being higher than；
S42, the frequency for improving PDM signal, until the frequency of PDM signal is greater than or equal to fa, enter step S5.
Further, further comprising the steps of before entering step S5:
Whether S43, judgment step S4 or the PDM signal frequency of step S41 output are higher than fb, entered step if being higher than
S44 enters step S5 if being lower than.
S44, the frequency for reducing PDM signal, until the frequency of PDM signal is less than or equal to fb, enter step S5.
Further, the step S42 improves the frequency of PDM signal using house dog, method particularly includes: by house dog
Start timing when detecting the failing edge of first high level, when timing reaches t1When, if next period is still not detected
High level failing edge, then WatchDog Timer overflow, force to draw signal between the every two high level in PDM signal
Height increases a high level signal, and after increase, house dog repeats identical detection process, until in t1Interior can be detected has
When the high level failing edge in next period, then the step of improving PDM signal frequency number is completed, wherein
Further, the step S44 improves the frequency of PDM signal using packing device, method particularly includes: by packing device
High level in PDM signal is merged, the frequency of PDM signal is made to be down to original frequencyAccounting for for PDM signal is kept simultaneously
Sky makes the driving signal PDM signal frequency of output not less than preset value f than constantb, it is assumed that the frequency of input packing device PDM signal
Rate is f；Work as fb+ k*100 < f≤fbWhen+(k+1) * 100, then k4=k+2；Wherein k is that natural number and successively starting from scratch takes.
It is at low cost the beneficial effects of the present invention are: structure is simple, by using each structure in light-adjusting module realize by
PDM signal makes the adjustment process of LED light brightness and color is natural, change procedure is soft to avoid low frequency flicker as driving signal
The phenomenon that, the stability and anti-interference of driving signal are improved, ensure that LED light brightness and color adjustment process can be smoothly complete
At.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the flow diagram of the first LED light light-dimming method provided in an embodiment of the present invention；
Fig. 2 is the structural block diagram of the first light adjusting system provided in an embodiment of the present invention；
Fig. 3 is the flow diagram of second of LED light light-dimming method provided in an embodiment of the present invention；
Fig. 4 is the structural block diagram of second of light adjusting system provided in an embodiment of the present invention；
Fig. 5 is the flow diagram of the third LED light light-dimming method provided in an embodiment of the present invention；
Fig. 6 is the structural block diagram of the third light adjusting system provided in an embodiment of the present invention；
Fig. 7 is the structural block diagram of packing device provided in an embodiment of the present invention；
Fig. 8 is the flow diagram of the 4th kind of LED light light-dimming method provided in an embodiment of the present invention；
Fig. 9 is the structural block diagram of the 4th kind of light adjusting system provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing
The technical effect of design of the invention, specific structure and generation is clearly and completely described, to be completely understood by the present invention
Purpose, feature and effect.Obviously, described embodiment is a part of the embodiments of the present invention, rather than is all implemented
Example, those skilled in the art's other embodiments obtained without creative efforts, belongs to the present invention
The range of protection.
It referring to Figures 1 and 2, is the first preferably embodiment, a kind of LED light light adjusting system, including it is sequentially connected
Light-adjusting module 1, constant-current driven module 2 and LED light display module 3, it is characterised in that: the light-adjusting module 1 is dimmed including index
Engine 11, linearity light adjusting device 12, multiplier 13, sigma-delta modulator 14；
The index light modulation engine 11 is used to convert intensity value digital signal for the digital signal of received intensity gear number,
And intensity value digital signal is issued into multiplier 13；
The linearity light adjusting device 12 is used to convert received light modulation numeric number signal to light modulation value digital signal, and will
Light modulation value digital signal issues multiplier 13；
The multiplier 13 is used to that received intensity value to be multiplied to obtain with light modulation value digital signal brightness value number
Signal, and brightness value digital signal is sent to sigma-delta modulator 14；
The sigma-delta modulator 14 is used to the received brightness value digital signal of institute switching to PDM signal, and the PDM is believed
Number it is sent to constant-current driven module 2；
The constant-current driven module 2 works according to PDM signal instruction driving LED light display module 3.
A kind of LED light light-dimming method is applied to LED light light adjusting system, and LED light light adjusting system includes sequentially connected light modulation
Module 1, constant-current driven module 2 and LED light display module 3, comprising the following steps:
S1, respectively input intensity gear number and light modulation numerical value；
S2, the intensity gear number of input is converted to by intensity value digital signal using exponentiation algorithm；It will be defeated using linear algorithm
The light modulation numerical value conversion entered is light modulation value digital signal；
S3, intensity value digital signal is multiplied to obtain brightness value digital signal with light modulation value digital signal；
S4, brightness value digital signal is converted into PDM signal；
S5, constant-current driven module 2 is sent to using PDM signal as driving signal；
S6, constant-current driven module 2 work according to PDM signal instruction driving LED light display module 3.
In the present embodiment, Infineon's XMC1300 controller is can be used in the light-adjusting module 1, and internal includes light-adjusting module 1
Included structure.
Since human eye is for the variation of brightness and nonlinear, but exponential type, index light modulation is shown for human eye
Nature, comfortable must be changed, therefore the calculation formula of exponentiation algorithm is in the step 2Wherein B is
The intensity value digital signal of output, A are the intensity gear number of input, k1And k2For the regular coefficients of setting, exponentiation algorithm is based on index
Engine 11 is dimmed to complete.
A numberical range is that the integer value of 1-10 makes B=0 as A=1；As A=2 or 3, k1=1, k2=4096, thenAs 4≤A≤10, k1=2, k2=4096, thenWhen strong to system input
After spending gear number, the index light modulation engine 11 converts intensity according to the exponentiation algorithm of setting for received intensity gear digital signal
It is worth digital signal, and intensity value digital signal is issued into multiplier 13, exponential law is presented to the impression of luminous intensity in human eye, therefore
The variation of brightness is realized according to pseudoindex curve in the present embodiment；Target intensity value is set in software and starts mapping and is passed
It send, after mapping transmission, intensity value can progressively reach target intensity value according to pseudoindex curve.
The calculation formula of linear algorithm is in the step 2* 100%, wherein E is the tune of output
Light value digital signal, C are current light modulation value, and D is the light modulation value of input, k3For regular coefficients, fcFor the clock frequency of system work
Rate, t are the dimming time of default light modulation variation, and linear algorithm is completed based on linearity light adjusting device 12, are adjusted when inputting to system
After light numerical value, the linearity light adjusting device 12 converts light modulation according to the linear algorithm of setting for received light modulation numeric number signal
It is worth digital signal, and light modulation value digital signal is issued into multiplier 13.
Light modulation value and intensity value digital signal are sent to by multiplier 13 using multiplier 13 in the step S3, by multiplication
Device 13 completes multiplication algorithm and obtains brightness value digital signal, while brightness value digital signal is sent to sigma-delta modulator 14.
Brightness value digital signal is converted to by PDM signal, detailed process using sigma-delta modulator 14 in the step S4
Are as follows: set the word length of the PDM signal as F, F round numbers；Each frame of PDM signal is then divided into 2FPosition, it is bright when input
When angle value is G, G is integer；G=B*E from the above then makes the high level signal quantity G in each frame, low level letter
Number amount is 2F- G, the G high level signal are evenly distributed on each frame of PDM signal.
The PDM signal for exporting sigma-delta modulator 14 in the step 5 is sent to constant current driving mould as driving signal
Block 2, the current signal of the driving output setting of constant-current driven module 2, to drive the LED light in LED light display module 3 according to defeated
The requirement entered is changed；Using PDM as pulse signal, pulsewidths constant realizes light modulation, while PDM by changing the period
Signal frequency is higher, and EMI characteristic is more preferable, it is not easy to generate low frequency flicker, wherein constant-current driven module 2 use chip model for
The Linear Driving chip of BCR421, the chip support the PDM signal input of highest 25KHz frequency, and highest inputs 40V voltage,
Output electric current can be adjusted in 10~350mA.
In the present embodiment, the brightness value signal calculates gained: brightness value G by formula shown below
(brightness level)=light modulation value (dimming level) * intensity value (intensity level), in the present embodiment,
The light modulation value digital signal and intensity value digital signal are all made of the digital signal of 12 word lengths, and 212=4096, then light modulation value
Digital signal and intensity value digital signal adjustable extent then adjust between 0-4095, and are taken from right number.Wherein light modulation value
(dimming level) for changing overall brightness, adjustable range adjusts between 0-4095, i.e., 0 bright or 4095 it is bright；
Intensity value (intensity level) for determining that color rank, same adjustable range adjust between 0-4095, i.e., 0 it is red
It is green or blue or 4095 it is red green or blue；Red, green or blue color, a sigma-delta modulator 14 can be used in LED light
Output PDM signal is only adjustable a LED light, i.e., shown in Fig. 2 is the structure for adjusting a LED light.In the present embodiment,
Light modulation value and intensity value are all 12, range 0~4095, it is ensured that adjustment process is fine and smooth, smooth.
It is second preferably embodiment and structural block diagram, with the first embodiment area referring to Fig. 3 and Fig. 4
It is not further comprising the steps of before entering step S5:
Whether the PDM signal frequency that S41, judgment step S4 are exported is lower than preset value fa, entered step if being lower than
S42 enters step S5 if being higher than；
S42, the frequency for improving PDM signal, until the frequency of PDM signal is greater than or equal to fa, enter step S5.
The step S42 improves the frequency of PDM signal using house dog 15, method particularly includes: existed by house dog 15
Start timing when detecting the failing edge of first high level, when timing reaches t1When, if next period is still not detected
High level failing edge, then 15 timer of house dog overflows, and forces to draw signal between the every two high level in PDM signal
Height increases a high level signal, and after increase, house dog 15 repeats identical detection process, until in t1It is interior to can be detected
When having the high level failing edge in next period, then the step of improving PDM signal frequency number is completed, wherein
Increasing house dog 15, the PDM signal that can be exported to sigma-delta modulator 14 be monitored, compared under low brightness values,
High level time in PDM signal is few, and is spaced farther out, is easy to produce low frequency flicker.Theoretically frequency is higher than 36Hz or more people
Eye is just difficult to be differentiated, and when actual frequency need to be higher than 50Hz, human eye is just imperceptible；It is optimal illumination frequency when frequency reaches 3KHz
Rate；When frequency reaches 10K~50K, even high-resolution camera is also captured less than flashing, thus, faMinimum needs
Be set as 50Hz, then it is describedSo as to be further ensured that the PDM signal of its output will not be too low, prevent
The phenomenon that generating flashing, while in the present embodiment, Infineon's XMC1300 controller can also be used in the light-adjusting module 1, in
Portion also includes 15 structure of house dog.
It referring to figure 5 and figure 6, is the third preferably embodiment and structural block diagram, with the first embodiment area
It is not further comprising the steps of before entering step S5:
Whether the PDM signal frequency of S43, judgment step S4 output is higher than fb, S44 is entered step if being higher than, if being lower than
Then enter step S5；
S44, the frequency for reducing PDM signal, until the frequency of PDM signal is less than or equal to fb, enter step S5.
The step S44 improves the frequency of PDM signal using packing device 16, method particularly includes: it will by packing device 16
High level merges in PDM signal, and the frequency of PDM signal is made to be down to original frequencyThe duty of PDM signal is kept simultaneously
Than constant, make the driving signal PDM signal frequency of output not less than preset value fb。
Assuming that the frequency of input packing device 16PDM signal is f；Work as fb+ k*100 < f≤fbWhen+(k+1) * 100, then k4=k
+2；Wherein k is that natural number and successively starting from scratch takes.
It include turn-off time counter 161, turn-on time counter 162, FIFO inside the packing device 16 referring to Fig. 7
Memory 163 (First Input First Output, refer to first in first out) and output generator 164, the turn-off time
The input terminal of counter 161 and the turn-on time counter 162 is connect with the output end of sigma-delta modulator 14, the disconnection
The output end of time counter 161 is connect with the first input end of FIFO memory 163 and the turn-on time counter 162
Output end is connect with the second input terminal of FIFO memory 163, the output end and output generator of the FIFO memory 163
164 input terminal connection, the output end of the output generator 164 with and the input terminal of constant-current driven module 2 connect, it is described to break
ETAD expected time of arrival and departure counter 161 is used to calculate the low level signal quantity in each period of PDM signal of input packing device 16, and will
Calculated result occurs to FIFO memory 163, and the turn-on time counter 162 is used to calculate the PDM letter of input packing device 16
High level signal quantity in number each period, and calculated result is occurred to FIFO memory 163, if turn-off time counts
The count value of device 161 or turn-on time counter 162 has reached fiducial value set by user, the two counters can all reset simultaneously
Restart to count.Before counter resets, count value is loaded into a FIFO memory 163, output generator
164 alternately take out the two count values one by one from FIFO memory 163, merge signal according to the program of setting,
And the PDM signal after merging is sent to constant-current driven module 2.
It is monitored using the PDM signal that packing device 16 exports sigma-delta modulator 14, can avoid output PDM signal frequency
Rate is excessively high, causes the switching circuit of constant-current driven module 2 to switch excessively frequent, to reduce the load and improvement of external switch circuit
EMC performance, while in the present embodiment, Infineon's XMC1300 controller can also be used in the light-adjusting module 1, inside also wrap
Include 16 structure of packing device.
It is the 4th kind of preferably embodiment and structural block diagram, with the first embodiment area referring to Fig. 8 and Fig. 9
It is not further comprising the steps of before entering step S5:
Whether the PDM signal frequency that S41, judgment step S4 are exported is lower than preset value fa, entered step if being lower than
S42 enters step S43 if being higher than；
S42, the frequency for improving PDM signal, until the frequency of PDM signal is greater than or equal to fa, enter step S5；
Whether the PDM signal frequency of S43, judgment step S41 output is higher than fb, S44 is entered step if being higher than, if being lower than
Then enter step S5；
S44, the frequency for reducing PDM signal, until the frequency of PDM signal is less than or equal to fb, enter step S5.
By above-mentioned steps process it is found that the 4th kind is sigma-delta modulator 14 and perseverance in structure preferably in embodiment
It is also connected with house dog 15 and packing device 16 between stream drive module 2 in turn, while using house dog 15 and packing device 16, then may be used
The PDM signal frequency exported simultaneously to sigma-delta modulator 14 is monitored, and not only can avoid underfrequency, while also avoiding frequency
Rate is excessively high, wherein the working principle of house dog 15 and packing device 16 and take measures respectively with second and the third embodiment
Identical, while in the present embodiment, Infineon's XMC1300 controller can also be used in the light-adjusting module 1, inside also include seeing
Door dog 15 and 16 structure of packing device.
The above, only better embodiment of the invention, but the present invention is not limited to above-described embodiments, as long as
The technical effect of the present invention is achieved by any identical or similar means for it, all should belong to protection scope of the present invention.
Claims (10)
1. a kind of LED light light adjusting system, including sequentially connected light-adjusting module (1), constant-current driven module (2) and LED light are shown
Module (3), it is characterised in that: the light-adjusting module (1) includes index light modulation engine (11), linearity light adjusting device (12), multiplier
(13), sigma-delta modulator (14)；
Index light modulation engine (11) is used to convert intensity value digital signal for the digital signal of received intensity gear number, and
Intensity value digital signal is issued into multiplier (13)；
The linearity light adjusting device (12) is used to convert received light modulation numeric number signal to light modulation value digital signal, and will adjust
Light value digital signal issues multiplier (13)；The multiplier (13) be used for by received intensity value and light modulation value digital signal into
Row, which is multiplied, obtains brightness value digital signal, and brightness value digital signal is sent to sigma-delta modulator (14)；
The sigma-delta modulator (14) is used to switch to institute's received brightness value digital signal PDM signal, and by the PDM signal
It is sent to constant-current driven module (2)；The constant-current driven module (2) is according to PDM signal instruction driving LED light display module (3)
Work.
2. LED light light adjusting system according to claim 1, it is characterised in that: the light-adjusting module (1) further includes house dog
(15), the house dog (15) is connected between sigma-delta modulator (14) and constant-current driven module (2), for monitoring sigma-delta tune
Whether the PDM signal frequency of device (14) output processed is lower than preset value fa；If being lower than fa, house dog (15) is then by sigma-delta modulator
(14) the PDM signal frequency exported rises above or is equal to fa。
3. LED light light adjusting system according to claim 1, it is characterised in that: the light-adjusting module (1) further includes packing device
(16), the packing device (16) is connected between sigma-delta modulator (14) and constant-current driven module (2), the packing device (16)
Whether the PDM signal for monitoring sigma-delta modulator (14) output is higher than preset value fb；If being higher than fb, packing device (16) then will
The PDM signal of sigma-delta modulator (14) output, which merges, makes its frequency be reduced to less than or equal to fb。
4. a kind of LED light light-dimming method is applied to LED light light adjusting system, LED light light adjusting system includes sequentially connected light modulation mould
Block (1), constant-current driven module (2) and LED light display module (3), it is characterised in that: the following steps are included:
S1, respectively input intensity gear number and light modulation numerical value；
S2, the intensity gear number of input is converted to by intensity value digital signal using exponentiation algorithm；Using linear algorithm by input
Light modulation numerical value conversion is light modulation value digital signal；
S3, intensity value digital signal is multiplied to obtain brightness value digital signal with light modulation value digital signal；
S4, brightness value digital signal is converted into PDM signal；
S5, constant-current driven module (2) are sent to using PDM signal as driving signal；
S6, constant-current driven module (2) are according to PDM signal instruction driving LED light display module (3) work.
5. LED light light-dimming method according to claim 4, it is characterised in that: the calculating of exponentiation algorithm is public in the step 2
Formula isWherein B is the intensity value digital signal of output, and A is the intensity gear number of input, k1And k2To set
Fixed regular coefficients, exponentiation algorithm are based on index light modulation engine (11) and complete.
6. LED light light-dimming method according to claim 4, it is characterised in that: the calculating of linear algorithm is public in the step 2
Formula isWherein E is the light modulation value digital signal of output, and C is current light modulation value, and D is defeated
The light modulation value entered, k3Regular coefficients, fcFor the clock frequency of system work, t is the dimming time of default light modulation variation, line
Property algorithm based on linearity light adjusting device (12) complete.
7. LED light light-dimming method according to claim 4, it is characterised in that: before entering step S5 further include following
Step:
Whether the PDM signal frequency that S41, judgment step S4 are exported is lower than preset value fa, S42 is entered step if being lower than, if high
In then entering step S5；
S42, the frequency for improving PDM signal, until the frequency of PDM signal is greater than or equal to fa, enter step S5.
8. LED light light-dimming method according to claim 7, it is characterised in that: before entering step S5 further include following
Step:
Whether S43, judgment step S4 or the PDM signal frequency of step S41 output are higher than fb, S44 is entered step if being higher than, if
Lower than then entering step S5；
S44, the frequency for reducing PDM signal, until the frequency of PDM signal is less than or equal to fb, enter step S5.
9. LED light light-dimming method according to claim 7, it is characterised in that: the step S42 using house dog (15) come
The frequency of PDM signal is improved, method particularly includes: by house dog (15) when detecting the failing edge of first high level
Timing, when timing reaches t1When, if the high level failing edge in next period is still not detected, house dog (15) timer overflows
Out, it forces to draw high signal between the every two high level in PDM signal, increases a high level signal, after increase, guard the gate
Dog (15) repeats identical detection process, until in t1It is interior to can be detected when having the high level failing edge in next period, then it is complete
At the step of improving PDM signal frequency number, wherein
10. LED light light-dimming method according to claim 8, it is characterised in that: the step S44 uses packing device (16)
The frequency of PDM signal is improved, method particularly includes: high level in PDM signal is merged by packing device (16), makes PDM
The frequency of signal is down to original frequencyIt keeps the duty ratio of PDM signal constant simultaneously, makes the driving signal PDM letter of output
Number frequency is not less than preset value fb, it is assumed that the frequency of input packing device (16) PDM signal is f；Work as fb+ k*100 < f≤fb+(k+
1) * 100 when, then k4=k+2；Wherein k is that natural number and successively starting from scratch takes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811195711.3A CN109379804B (en) | 2018-10-15 | 2018-10-15 | Dimming system and dimming method for LED lamp |
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| CN110996432A (en) * | 2019-12-31 | 2020-04-10 | 深圳市创荣发电子有限公司 | Dimming method, readable storage medium and LED lamp |
| WO2020233652A1 (en) * | 2019-05-23 | 2020-11-26 | 上海艾为电子技术股份有限公司 | Exponential dimming method and system of light-emitting diode |
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| CN109379804B (en) | 2023-12-22 |
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