CN105682295B - Led control circuit - Google Patents

Led control circuit Download PDF

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Publication number
CN105682295B
CN105682295B CN201610159996.XA CN201610159996A CN105682295B CN 105682295 B CN105682295 B CN 105682295B CN 201610159996 A CN201610159996 A CN 201610159996A CN 105682295 B CN105682295 B CN 105682295B
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pwm signal
signal
switch circuit
timing
signal output
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CN105682295A (en
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黄增锋
孙德云
杨荣
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Shanghai Eastsoft Microelectronics Co Ltd
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Shanghai Eastsoft Microelectronics Co Ltd
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B45/00Circuit arrangements for operating light emitting diodes [LED]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A kind of LED control circuit, including:Controller, first switch circuit and second switch circuit, wherein:The controller, suitable for when receiving colour temperature Regulate signal, corresponding target color temperature value is calculated according to the colour temperature Regulate signal, the first pwm signal with the target color temperature value duty ratio corresponding is exported by the first pwm signal output end, second pwm signal is exported by the second pwm signal output end, and first pwm signal and second pwm signal are complementary;The first switch circuit, is coupled with the first pwm signal output end and the control end of cold light LED array;The second switch circuit, is coupled with the second pwm signal output end and the control end of warm light LED array.Using the LED control circuit, it is possible to achieve the simplicity to LED colour temperatures is adjusted.

Description

LED control circuit
Technical field
The present invention relates to field of LED illumination, more particularly to a kind of LED control circuit.
Background technology
Light emitting diode (Light Emitting Diode, LED) is excellent because of its energy-saving and environmental protection, light efficiency height, long lifespan etc. Point, has " green energy resource " laudatory title, just progressively replaces conventional light source, the light source as a new generation.
With the progress and the raising of quality of the life of science, there are different demands to LED illumination effect in user.To realize Secondary energy-saving, brightness of the user to LED is adjusted, and freely adjusts the bright-dark degree of light.To build different atmosphere, user Colour temperature to LED is adjusted, personal settings light environment.
In the existing circuit for realizing the regulation of LED colour temperatures, the LED of two-way different-colour is generally included, passes through two differences Pulse width modulation (Pulse Width Modulation, PWM) signal generating circuit produce two-way independence pwm signal, And it is separately input to corresponding LED., it is necessary to the pwm signal of two-way independence be synchronized, synchronous mistake during colour temperature regulation Need to be controlled using more complicated algorithm in journey.
The content of the invention
What the present invention was solved is how to realize the simplicity adjustment to LED colour temperatures.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of LED control circuit, including:Controller, first open Powered-down road and second switch circuit, wherein:
The controller, suitable for when receiving colour temperature Regulate signal, calculating corresponding according to the colour temperature Regulate signal Target color temperature value, the first pwm signal with the target color temperature value duty ratio corresponding is exported by the first pwm signal output end, Second pwm signal is exported by the second pwm signal output end, and first pwm signal and second pwm signal are complementary;
The first switch circuit, is coupled with the first pwm signal output end and the control end of cold light LED array, Suitable for the level according to first pwm signal, the first pwm signal output end and the company of the cold light LED array are controlled Connect and be opened or closed;
The second switch circuit, is coupled with the second pwm signal output end and the control end of warm light LED array, Suitable for the level according to second pwm signal, the second pwm signal output end and the company of the warm light LED array are controlled Connect and be opened or closed.
Optionally, the LED control circuit also includes:
Timing switch circuit, be coupled in the controller and the first switch circuit and the second switch circuit it Between, suitable for starting timing when receiving the timing signal that the controller is sent;And sent when receiving the controller Switch controlling signal when, control between the first switch circuit and the first pwm signal output end, the second switch Switch connection status between circuit and the second pwm signal output end, wherein, the switch controlling signal is cut-off signal Or closure signal;
The controller is further adapted for:When receiving brightness regulated signal, the corresponding mesh of the brightness regulated signal is calculated Brightness percentage is marked, the first duration and the second duration are calculated according to the object brightness percentage;When receiving interrupt signal When, send the timing signal to the timing switch circuit;When detecting timing duration and reaching first duration, to institute State timing switch circuit and send the cut-off signal, and send timing signal to the timing switch circuit again;When detecting When reclocking duration reaches second duration, the closure signal is sent to the timing switch circuit.
Optionally, the timing switch circuit includes timer and two-way electronic switch, wherein:
The timer, is coupled with the timing signal output end of the controller, suitable for receiving during the timing signal Start from scratch timing;
The two-way electronic switch, the first signal input part is coupled with the first pwm signal output end, and the first signal is defeated Go out end to couple with the first switch circuit;Secondary signal input is coupled with the second pwm signal output end, secondary signal Output end is coupled with the second switch circuit;The switch controlling signal of switch controlling signal input and the controller is exported End coupling.
Optionally, the controller includes interrupt signal input, is inputted with the first signal of the two-way electronic switch End coupling, the interrupt signal is the rising edge of first pwm signal.
Optionally, the controller is suitable to calculate the first duration T1 by formula T1=T × L/2, passes through formula T2 =T-2 × T1 calculates the second duration T2, wherein:T is the cycle of first pwm signal, and L is the object brightness percentage Than.
Optionally, the first switch circuit is NMOS tube structure, and first pwm signal of its grid and the controller is defeated Go out end coupling, source electrode is coupled with ground, the control end of grid and the cold light LED array is coupled, suitable for when first pwm signal Level be high level when turn on.
Optionally, the second switch circuit is NMOS tube structure, and second pwm signal of its grid and the controller is defeated Go out end coupling, source electrode is coupled with ground, the control end of grid and the warm light LED array is coupled, suitable for when second pwm signal Level be high level when turn on.
Compared with prior art, the technical scheme of the embodiment of the present invention has the advantages that:
When controller receives colour temperature Regulate signal, calculate the corresponding target color temperature value of colour temperature Regulate signal, and export with Corresponding first pwm signal of target color temperature value and the second pwm signal, and the first pwm signal and the second pwm signal are complementary.By In under any circumstance, the first pwm signal is complementary with the second pwm signal, and saltus step occurs for the level of pwm signal all the way wherein When, saltus step can also occur for the level of another road pwm signal, i.e., the two level jumping moment it is identical, therefore without again by first Pwm signal is synchronous with the second pwm signal, therefore can realize the simplicity adjustment to LED colour temperatures.
Further, controlled by two-way electronic switch between the first pwm signal output end and first switch circuit, second Connection between pwm signal output end and second switch circuit is opened or closed, can be to being input to the of first switch circuit The high level pulse time of second pwm signal of one pwm signal and second switch circuit is adjusted, so as to cold light The fluorescent lifetime of LED array and warm light LED array is adjusted, and realizes the brightness regulation to LED.
In addition, within a pwm signal cycle, when a length of first duration T1 that two-way electronic switch is first closed breaks afterwards In the when a length of second duration T2 opened, remaining duration T3, two-way electronic switch be in closure state, T3=T-T1-T2=T × L/2=T1, namely within a pwm signal cycle, the duration that two-way electronic switch is closed twice is equal.That is, one In the individual pwm signal cycle, the dutycycle of the first pwm signal is equal with the dutycycle of the second pwm signal, so may be implemented in color In the case that temperature is constant, LED brightness regulation is realized.
Brief description of the drawings
Fig. 1 is a kind of structural representation of LED control circuit in the embodiment of the present invention;
Fig. 2 is the ripple of corresponding first pwm signal of a kind of different-colour in the embodiment of the present invention and the second pwm signal Shape figure;
Fig. 3 is the structural representation of another LED control circuit in the embodiment of the present invention;
Fig. 4 is the waveform of the first pwm signal and the second pwm signal before the carry out brightness regulation in one embodiment of the invention Figure;
Fig. 5 is the waveform of the first pwm signal and the second pwm signal after the carry out brightness regulation in one embodiment of the invention Figure.
Embodiment
In existing LED colour temperature adjusts circuis, the LED of two-way different-colour is controlled by the pwm signal of two-way independence.Entering , it is necessary to calculate each self-corresponding target duty ratio of two-way pwm signal respectively when row colour temperature is adjusted.Accounted in generation two-way correspondence target After the pwm signal of empty ratio, two-way pwm signal is synchronized, so as to realize that colour temperature is adjusted.However, existing synchronizing process is needed Two-way pwm signal is controlled using the algorithm more loaded.
In embodiments of the present invention, when controller receives colour temperature Regulate signal, the corresponding mesh of colour temperature Regulate signal is calculated Mark color temperature value, and export corresponding with target color temperature value the first pwm signal and the second pwm signal, and the first pwm signal and the Two pwm signals are complementary.Because under any circumstance, the first pwm signal is complementary with the second pwm signal, PWM believes all the way wherein Number level when occurring saltus step, saltus step can also occur for the level of another road pwm signal, i.e., the two level jumping moment it is identical, Therefore without again adjusting can realize synchronous with the second pwm signal of the first pwm signal to the simplicity of LED colour temperatures.
It is understandable to enable above-mentioned purpose, feature and beneficial effect of the invention to become apparent, below in conjunction with the accompanying drawings to this The specific embodiment of invention is described in detail.
Reference picture 1, the embodiments of the invention provide a kind of LED control circuit, including:Controller 101, first switch circuit 102 and second switch circuit 103.
In specific implementation, controller 101, suitable for when receiving the colour temperature Regulate signal of input, being adjusted according to colour temperature Signal of change obtains corresponding target color temperature value., can be according to target color temperature value, respectively after calculating obtains aim colour temperature value Obtain the dutycycle of corresponding first pwm signal of target color temperature value and the dutycycle of the second pwm signal, the first pwm signal with Second pwm signal is complementary.
In embodiments of the present invention, can be generated using complementary PWM signals generator complementation the first pwm signal and Second pwm signal, wherein, complementary PWM signals generator can be built in controller 101.First pwm signal and the 2nd PWM Signal complementation refers to:When first pwm signal is high level, the second pwm signal is low level;Conversely, the first pwm signal is low electricity Usually, the second pwm signal is high level.
Controller 101 can include the first pwm signal output end P1 and the second pwm signal output end P2, pass through first Pwm signal output end P1 exports the first pwm signal of target color temperature value duty ratio corresponding, passes through the second pwm signal output end P2 Export the second pwm signal of target color temperature value duty ratio corresponding.
In embodiments of the present invention, controller 101 can export the microcontroller of two-way pwm signal for single-chip microcomputer etc. (Micro Controller Unit, MCU).
In actual applications, colour temperature Regulate signal can be triggered by user.Colour temperature regulation rotation is provided with LED lamp panel Button, realizes that colour temperature is adjusted by rotating colour temperature adjusting knob.When user rotates colour temperature adjusting knob, you can triggering generation color Warm Regulate signal is simultaneously input in controller 101.Controller 101 can include the input for receiving colour temperature Regulate signal (in Fig. 1 It is not shown).
For example, being shown on the colour temperature adjusting knob on user's rotating LED light fixture, the corresponding dial of colour temperature adjusting knob " warm light ", " neutral light " and " cold light " three colour temperature options.User rotates colour temperature adjusting knob to " warm light " option, then gives birth to Into colour temperature Regulate signal it is corresponding with " warm light " option.
In specific implementation, colour temperature Regulate signal can also be triggered by other control devices.
In embodiments of the present invention, first switch circuit 102 is arranged on the first pwm signal output end P1 and cold light LED Between the control end of array 104, one end is coupled with the first pwm signal output end P1, the control of the other end and cold light LED array 104 End coupling processed.First switch circuit 102 can according to the level of the first pwm signal, the first pwm signal output end P1 of control with it is cold Connection between the control end of light LED array 104 is opened or closed.
Analogously, second switch circuit 103 is arranged on the second pwm signal output end P2 and warm light LED array 105 Between control end, one end is coupled with the second pwm signal output end P2, and the control end of the other end and warm light LED array 105 is coupled. Second switch circuit 103 can be according to the level of the second pwm signal, the second pwm signal output end P2 of control and warm light LED array Connection between 105 control end is opened or closed.
In embodiments of the present invention, first switch circuit 102 can be NMOS tube structure.Correspondingly, second switch circuit 103 can also be NMOS tube structure.
Reference picture 1, in an embodiment of the present invention, first switch circuit 102 be NMOS tube N1, NMOS tube N1 grid with First pwm signal output end P1 is coupled, and drain electrode and the control end of cold light LED array 104 are coupled, and source electrode is coupled with ground.When first The level of pwm signal is turned on when being high level, is ended when the level of the first pwm signal is low level.When NMOS tube N1 conductings When, the connection closure between the first pwm signal output end P1 and the control end of cold light LED array 104;Conversely, as NMOS tube N1 During cut-off, the connection between the first pwm signal output end P1 and the control end of cold light LED array 104 disconnects.
Second switch circuit 103 is NMOS tube N2, and its grid and the second pwm signal output end P2 are coupled, drain electrode and warm light The control end coupling of LED array 105, source electrode is coupled with ground.Turned on when the level of the second pwm signal is high level, when second The level of pwm signal ends when being low level.When NMOS tube N2 is turned on, the second pwm signal output end P2 and warm light LED array Connection closure between 105 control end;Conversely, when NMOS tube N2 ends, the second pwm signal output end P2 and warm light LED Connection between the control end of array 105 disconnects.
In other embodiments of the present invention, first switch circuit 102 and second switch circuit 103 can also use other Circuit structure, as long as the company between the first pwm signal output end P1 and the control end of cold light LED array 104 can be controlled respectively Connect, the connection between the control end of the second pwm signal output end P2 and warm light LED array 105 is opened or closed.
In embodiments of the present invention, LED control circuit can also be coupled with LED drive power 106.LED drive power 106 Electric current of the driving current output end respectively with the current input terminal of cold light LED array 104 and warm light LED array 105 input End coupling, is suitable for cold light LED array 104 and warm light LED array 105 provides driving current.
In actual applications, cold light LED refers to that the colour temperature LED between 6000K~6500K, warm light LED refer to that colour temperature exists LED between 3000K~4000K, wherein, K (Kelvin) is the unit of colour temperature.
The colour temperature Principles of Regulation of the LED control circuit to being provided in the above embodiment of the present invention are illustrated below.
First, the principle that colour temperature is adjusted is illustrated.Understand in actual applications, adjust the colour temperature of LED lamp, essence Upper is exactly the dutycycle D1 for adjusting the pwm signal for being input to cold light LED array and the pwm signal for being input to warm light LED array Dutycycle D2 proportionate relationship.Ratio between D1 and D2 is smaller, and the light that LED lamp is sent is warmed up more partially.On the contrary, D1 and D2 Between ratio it is bigger, the light that LED lamp is sent is more colder.
In embodiments of the present invention, the pwm signal for being input to cold light LED array 104 is the first pwm signal, is input to warm The pwm signal of light LED array 105 is the second pwm signal.Because the first pwm signal and the second pwm signal are believed by complementary PWM The generation of number generator, therefore only need to adjust the output duty cycle of complementary PWM signals generator, you can change the first PWM letters Number dutycycle and the second pwm signal dutycycle between proportionate relationship.
Different colour temperatures can be directed to, the dutycycle of corresponding first pwm signal and the dutycycle of the second pwm signal are set Between proportionate relationship.
In an embodiment is invented, the ratio for setting the dutycycle of the first pwm signal and the dutycycle of the second pwm signal is closed It is for 1:When 3, namely the dutycycle of the first pwm signal is when being that the dutycycle of the 25%, second pwm signal is 75%, LED lamp hair Go out warm light, corresponding color temperature value is 3500K;Set the ratio of the dutycycle of the first pwm signal and the dutycycle of the second pwm signal Relation is 1:When 1, namely the dutycycle of the first pwm signal is when being that the dutycycle of the 50%, second pwm signal is 50%, LED lamp Neutral light is sent, corresponding color temperature value is 5000K;Set the dutycycle of the first pwm signal and the dutycycle of the second pwm signal Proportionate relationship is 3:When 1, namely the dutycycle of the first pwm signal is when being that the dutycycle of the 75%, second pwm signal is 25%, LED Light fixture sends cold light, and corresponding color temperature value is 6500K.
Reference picture 2, gives in one embodiment of the invention, when LED lamp sends warm light, neutral light and cold light, and first Pwm signal oscillogram and the second pwm signal oscillogram.
The mapping relations of the colour temperature of above-mentioned LED lamp and the ratio of pwm signal dutycycle can be stored in advance in controller In 101.
Setting LED lamp currently sends neutral light.Colour temperature adjusting knob on user's rotating LED light fitting panel, by colour temperature Adjusting knob rotates to " warm light " option, now, and colour temperature adjusting knob is triggered, and generates colour temperature Regulate signal.Controller 101 exists Receive after colour temperature Regulate signal, calculating obtains the corresponding color temperature value of colour temperature Regulate signal for 3500K.
From above-mentioned default proportionate relationship, when color temperature value is 3500K, the dutycycle of the first pwm signal is 25%, The dutycycle of second pwm signal is 75%.The pwm signal that dutycycle all the way is 25% is generated by complementary PWM signals generator As the first pwm signal, exported by the first pwm signal output end P1 of controller 101;Complementary PWM signals generator is generated Another road dutycycle for 75% pwm signal as the second pwm signal, pass through the second pwm signal output end of controller 101 P2 is exported.
It is that cold light LED array 104 and warm light LED array 105 provide driving current by LED drive power 106.
When the level of the first pwm signal is high level, the level of the second pwm signal is low level.Now, first switch Circuit 102 is turned on, and the driving cold light LED of LED drive power 106 array 104 lights;Second switch circuit 103 ends, warm light LED Array 105 does not light.
Correspondingly, when the level of the second pwm signal is high level, the level of the first pwm signal is low level.Now, Second switch circuit 103 is turned on, and the driving warm light of LED drive power 106 LED array 105 lights;First switch circuit 102 ends, Cold light LED array 104 does not light.
As can be seen here, in the embodiment of the present invention, color is carried out by using complementary the first pwm signal and the second pwm signal Temperature regulation, because in any case, the first pwm signal is complementary with the second pwm signal, therefore need not be by the first pwm signal Synchronized with the second pwm signal, so as to save synchronizing process, realize and the simplicity of LED colour temperatures is adjusted.
In actual applications, LED lamp send color temperature value it is constant in the case of, it is also possible to there is user to LED lamp The demand that brightness is adjusted.For the demand, the embodiment of the present invention gives another LED control circuit, reference picture 3.
In embodiments of the present invention, can be in controller 101 and first switch circuit 102 and second switch circuit 103 Between, it is provided with timing switch circuit 107.
In actual applications, brightness regulated signal can be triggered by user.Brightness tune can be provided with LED lamp panel Knob is saved, brightness regulation is realized by rotating brightness regulation knob.When user rotates brightness regulation knob, you can generation is bright Degree Regulate signal is simultaneously input in controller 101.
In specific implementation, brightness regulated signal can also be triggered by other control devices or software.For example, in intelligence APP (application) software of control LED lamp working condition is installed, user operates the APP softwares, choosing in mobile phone Select the object brightness of the LED lamp.The APP Software Creates brightness regulated signal, and send to LED lamp, so as to realize Brightness to LED lamp is adjusted.
Controller 101 can calculate the corresponding object brightness of brightness regulated signal when receiving brightness regulated signal Percentage, and detect whether there is interrupt signal input in real time in interrupt signal input., can be with according to object brightness percentage Calculate the first duration and the second duration.When having detected interrupt signal input, timing is sent to timing switch circuit 107 Signal.
Timing switch circuit 107 starts timing when receiving the timing signal of the transmission of controller 101.
When the timing duration that controller 101 detects timing switch circuit 107 reaches the first duration, to timing switch circuit 107 send cut-off signal, and send timing signal to timing switch circuit again.
When timing switch circuit 107 receives cut-off signal, control first switch circuit 102 and the first pwm signal are exported Between the P1 of end, the connection between the pwm signal output end P2 of second switch circuit 103 and second disconnects.Timing switch circuit 107 Restart timing after the timing signal for receiving the transmission of controller 101.
When the timing duration that controller 101 detects the reclocking of timing switch circuit 107 reaches the second duration, to timing On-off circuit 107 sends closure signal.
Timing switch circuit 107 is received after closure signal, by the pwm signal output end of first switch circuit 102 and first Connection closure between P1, between the pwm signal output end P2 of second switch circuit 103 and second.
In an embodiment of the present invention, controller 101 calculates the first duration T1 and the second duration T2 according to equation below:
T1=T × L/2 (1)
T2=T-2 × T1 (2)
Wherein, T is the cycle of the first pwm signal, and L is object brightness percentage.
In an embodiment of the present invention, reference picture 3, timing switch circuit 107 can include timer 1071 and two-way Electronic switch 1072.
The timing signal output end P3 of timer 1071 and controller 101 is coupled, when the meter for receiving the transmission of controller 101 When signal when start timing.It should be noted that being meter of starting from scratch when timer 1071 often receives a timing signal When, rather than the cumulative timing of progress on the basis of upper once timing time.
Two-way electronic switch 1072, including the first signal input part 1, secondary signal input 2, the first signal output part 3, Secondary signal output end 4 and switch controlling signal input 5, wherein:First signal input part 1 and the first of controller 101 Pwm signal output end P1 is coupled, and the first signal output part 3 is coupled with first switch circuit 102;Secondary signal input 2 and control The second pwm signal output end P2 couplings of device 101 processed, secondary signal output end 4 is coupled with second switch circuit 103;Switch control The switch controlling signal output end P4 of signal input part 5 processed and controller 101 is coupled.
Controller 101 controls two-way electronic switch by switch controlling signal output end P4 output switch control signals 1072, switch controlling signal includes cut-off signal and closure signal.
In embodiments of the present invention, the interrupt signal input P5 of controller 101 can be with two-way electronic switch 1072 First signal input part 1 is coupled, and interrupt signal input P5 inputs the first pwm signal.When the rising for detecting the first pwm signal Along when, controller 101 judge detected interrupt signal input, to timer 1071 send timing signal.
The brightness regulation process of LED control circuit below by citing to being provided in Fig. 3 is illustrated.
First, the principle to brightness regulation is illustrated.
Understand in actual applications, adjust the brightness of LED lamp, be exactly substantially that regulation is input to cold light LED array 104 Pwm signal dutycycle and be input to warm light LED array 105 pwm signal dutycycle.The percentage of LED lamp brightness Than the dutycycle sum that can regard two-way pwm signal as, that is to say, that the dutycycle sum of two-way pwm signal is bigger, LED The brightness of light fixture is higher.
The frequency of the first pwm signal is set as 1KHz, i.e., a cycle of the first pwm signal when a length of 1ms, t0~t3 is The a cycle of one the first pwm signal.Before brightness regulation is carried out, LED lamp sends neutral light, and object brightness percentage is 100%, the dutycycle of the first pwm signal is 50%, and the dutycycle of the second pwm signal is 50%, the first pwm signal and second The oscillogram reference picture 4 of pwm signal.After the object brightness percentage of LED lamp is adjusted into 60%, the first pwm signal with And second pwm signal oscillogram reference picture 5.
Brightness regulation knob on user's rotating LED light fixture, " 60% brightness " option is rotated to by brightness regulation knob, this When, controller 101 receives brightness regulated signal, and it is 60% to know corresponding object brightness percentage.According to formula (1) and public affairs Formula (2), calculating obtains a length of 0.3ms when first, a length of 0.4ms when second, and the first duration T1 is t0~t1, and the second duration T2 is T1~t2.
Step 1, when controller 101 detects the rising edge of the first pwm signal, there is interrupt signal input in judgement, lead to Cross timing signal output end P3 and export timing signal to timer 1071.Timer 1071 starts meter after timing signal is received When.When timing duration not yet reaches 0.3ms, i.e., when not yet reaching moment t1, two-way electronic switch 1072 is in closure state, I.e. between the first pwm signal output end P1 and first switch circuit 102, the second pwm signal output end P2 and second switch circuit Closed between 103.
Step 2, controller 101 is when detecting timing duration and reaching 0.3ms, by switch controlling signal output end P4 to Two-way electronic switch 1072 sends cut-off signal, and sends timing signal to timer 1071.Two-way electronic switch 1072 is connecing Receive after cut-off signal, control the first pwm signal output end P1 and first switch circuit 102 between, the second pwm signal output end Disconnected between P2 and second switch circuit 103.Timer 1071 is after timing signal is received, timing of starting from scratch again.
Step 3, controller 101 reaches the moment when the reclocking duration for detecting timer 1071 reaches 0.4ms During t2, closure signal is sent to two-way electronic switch 1072.Two-way electronic switch 1072 is after closure signal is received, control the Between one pwm signal output end P1 and first switch circuit 102, the second pwm signal output end P2 and second switch circuit 103 it Between connection close.
Afterwards, controller 101 has detected whether interrupt signal input again again, when detecting interrupt signal, holds again Row above-mentioned steps 1~3.
In Fig. 5, the dutycycle of the first pwm signal is 30%, and the high level pulse time is t0~t1;Second pwm signal Dutycycle is 30%, and the high level pulse time is t2~t3, and proportionate relationship therebetween is still 1:1, therefore the color of LED lamp Temperature does not change.Sum of the two is 60%, as object brightness percentage.
It is 50% in the dutycycle of the first pwm signal output end P1 the first pwm signals exported with reference to Fig. 4 and Fig. 5, I.e. preceding 0.5ms is high level, is low level in rear 0.5ms;Correspondingly, the 2nd PWM letters of the second pwm signal output end P2 outputs Number preceding 0.5ms be low level, rear 0.5ms be high level.
Disconnected in t1 moment two-ways electronic switch 1072, now the first pwm signal output end P1 and first switch circuit 102 Between connection disconnect, the high level pulse time for being substantially input to the first pwm signal of first switch circuit 102 is 0.3ms, namely the dutycycle of substantial the first pwm signal for being input to first switch circuit 102 is 30%, cold light LED array 104 fluorescent lifetime is 0.3ms rather than 0.5ms.
In t1~t2, two-way electronic switch 1072 is off.
Closed in t2 moment two-ways electronic switch 1072, now the second pwm signal output end P2 and second switch circuit 103 Between connection closure, the high level pulse time for being substantially input to the second pwm signal of second switch circuit 103 is 0.3ms, namely the dutycycle of substantial the second pwm signal for being input to second switch circuit 103 is 30%, warm light LED array 105 fluorescent lifetime is 0.3ms rather than 0.5ms.
That is, in embodiments of the present invention, the first pwm signal not generated to controller 101 actually with And second the dutycycle of pwm signal be adjusted, but disconnection and closure by two-way electronic switch 1072, to adjust first The high level pulse time being an actually-received on on-off circuit 102 and second switch circuit 103.
When carrying out brightness regulation, the first pwm signal and the second pwm signal of the first pwm signal output end P1 outputs The dutycycle of second pwm signal of output end P2 outputs does not change all the time.What is changed is enter into first switch The dutycycle of first pwm signal of circuit 102, and it is input to the dutycycle of the second pwm signal of second switch circuit 103. The reason for changing is that the control two-way of controller 101 electronic switch 1072 disconnects so that be input to first switch circuit 102 The dutycycle of first pwm signal is less than the dutycycle for the first pwm signal that the first pwm signal output end P1 is exported, and is input to the The dutycycle of second pwm signal of two on-off circuits 103 is less than the second pwm signal that the second pwm signal output end P2 is exported Dutycycle.
As can be seen here, the first pwm signal output end P1 and first switch circuit 102 are controlled by two-way electronic switch 1072 Between, the connection between the second pwm signal output end P2 and second switch circuit 103 be opened or closed, can be to being input to First pwm signal of one on-off circuit 102 and the high level pulse time of the pwm signal of second switch circuit 103 second are carried out Adjustment, so as to be adjusted to the fluorescent lifetime of cold light LED array 104 and warm light LED array 105, so as to realize that brightness is adjusted Section.
Within a pwm signal cycle, at the t1 moment, controller control two-way electronic switch disconnects;At t2 moment, control Device control two-way electronic switch closure.First duration T1=T × L/2, the second duration T2=T-2 × T1, the first pwm signal cycle In interior remaining duration T3, two-way electronic switch is in closure state, T3=T-T1-T2=T × L/2=T1, namely at one In the pwm signal cycle, the duration that two-way electronic switch is closed twice is equal.That is, within a pwm signal cycle, the The dutycycle of one pwm signal is equal with the dutycycle of the second pwm signal, so may be implemented in colour temperature it is constant in the case of, it is real Existing brightness regulation.
It is understood that in actual applications, two-way electronic switch 1072 can also using controller internal circuit come Realize, for example, being realized by the digital circuit inside controller chip.In other embodiments of the present invention, two-way electronic cutting Closing 1072 can also be realized using other modes, as long as the first pwm signal output end P1 and first switch circuit 102 can be controlled Between, between the second pwm signal output end P2 and second switch circuit 103 simultaneously switch off and close.
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art, are not departing from this In the spirit and scope of invention, it can make various changes or modifications, therefore protection scope of the present invention should be with claim institute The scope of restriction is defined.

Claims (6)

1. a kind of LED control circuit, it is characterised in that including:Controller, timing switch circuit, first switch circuit and Two on-off circuits, wherein:
The controller, suitable for when receiving colour temperature Regulate signal, corresponding target is calculated according to the colour temperature Regulate signal Color temperature value, exports the first pwm signal with the target color temperature value duty ratio corresponding by the first pwm signal output end, passes through Second pwm signal output end exports the second pwm signal, and first pwm signal and second pwm signal are complementary;When connecing When receiving brightness regulated signal, the corresponding object brightness percentage of the brightness regulated signal is calculated, according to the object brightness Percentage calculates the first duration and the second duration;Upon receiving an interrupt signal, timing is sent to the timing switch circuit Signal;When detecting timing duration and reaching first duration, cut-off signal is sent to the timing switch circuit, and again Timing signal is sent to the timing switch circuit;When detecting reclocking duration and reaching second duration, to described Timing switch circuit sends closure signal;
The timing switch circuit, be coupled in the controller and the first switch circuit and the second switch circuit it Between, suitable for starting timing when receiving the timing signal that the controller is sent;And sent when receiving the controller Switch controlling signal when, control between the first switch circuit and the first pwm signal output end, the second switch Switch connection status between circuit and the second pwm signal output end, wherein, the switch controlling signal is cut-off signal Or closure signal;
The first switch circuit, couples with the first pwm signal output end and the control end of cold light LED array, is suitable to According to the level of first pwm signal, the first pwm signal output end and the connection of the cold light LED array is controlled to break Open or close;
The second switch circuit, couples with the second pwm signal output end and the control end of warm light LED array, is suitable to According to the level of second pwm signal, the second pwm signal output end and the connection of the warm light LED array is controlled to break Open or close.
2. LED control circuit as claimed in claim 1, it is characterised in that the timing switch circuit include timer and Two-way electronic switch, wherein:
The timer, is coupled with the timing signal output end of the controller, suitable for receiving during the timing signal from zero Start timing;
The two-way electronic switch, the first signal input part is coupled with the first pwm signal output end, the first signal output part Coupled with the first switch circuit;Secondary signal input is coupled with the second pwm signal output end, secondary signal output End is coupled with the second switch circuit;The switch controlling signal output end coupling of switch controlling signal input and the controller Connect.
3. LED control circuit as claimed in claim 2, it is characterised in that the controller includes interrupt signal input, with The first signal input part coupling of the two-way electronic switch, the interrupt signal is the rising edge of first pwm signal.
4. the LED control circuit as described in any one of claims 1 to 3, it is characterised in that the controller is suitable to pass through formula T1=T × L/2 calculates the first duration T1, and the second duration T2 is calculated by formula T2=T-2 × T1, wherein:T is institute The cycle of the first pwm signal is stated, L is the object brightness percentage.
5. LED control circuit as claimed in claim 1, it is characterised in that the first switch circuit is NMOS tube structure, its First pwm signal output end of grid and the controller is coupled, and source electrode is coupled with ground, grid and the cold light LED array Control end is coupled, suitable for being turned on when the level of first pwm signal is high level.
6. LED control circuit as claimed in claim 1, it is characterised in that the second switch circuit is NMOS tube structure, its Second pwm signal output end of grid and the controller is coupled, and source electrode is coupled with ground, grid and the warm light LED array Control end is coupled, suitable for being turned on when the level of second pwm signal is high level.
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CN106604448B (en) * 2016-11-24 2018-11-30 江西美的贵雅照明有限公司 A kind of light modulation toning control circuit and LED illumination product
CN106658871A (en) * 2017-02-28 2017-05-10 漳州立达信光电子科技有限公司 Light emitting diode circuit with color temperature adjustment capability
CN110191549B (en) * 2019-07-04 2021-03-09 浙江阳光美加照明有限公司 LED (light emitting diode) accurate timing switch lamp and accurate timing drive circuit thereof
CN110996454A (en) * 2019-12-31 2020-04-10 珠海雷特科技股份有限公司 Complementary PWM dimming method

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