CN105592587B - The control method of LED - Google Patents

The control method of LED Download PDF

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Publication number
CN105592587B
CN105592587B CN201510924566.8A CN201510924566A CN105592587B CN 105592587 B CN105592587 B CN 105592587B CN 201510924566 A CN201510924566 A CN 201510924566A CN 105592587 B CN105592587 B CN 105592587B
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led
string
chip microcomputer
white
lamp string
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CN105592587A (en
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袁宗乾
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Zhejiang kaiyao Lighting Co Ltd
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Zhejiang kaiyao Lighting 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]

Abstract

The invention discloses a kind of control method of LED, the LED includes AC/DC converters, single-chip microcomputer, warm white LED string, cool white LED string, red LED lamp string, green light LED lamp string, blue LED lamp string, radio-frequency module and the remote control coordinated with radio-frequency module;AC/DC converters are electrically connected with radio-frequency module, single-chip microcomputer, warm white LED string, cool white LED string, red LED lamp string, green light LED lamp string, blue LED lamp string respectively, and single-chip microcomputer is electrically connected with radio-frequency module, warm white LED string, cool white LED string, red LED lamp string, green light LED lamp string, blue LED lamp string respectively.The characteristics of present invention effectively eliminates Voltage Drop and electric current falls.

Description

The control method of LED
Technical field
The present invention relates to technical field of LED illumination, can effectively eliminate Voltage Drop more particularly, to one kind and electric current falls LED control method.
Background technology
As LED is in the application of lighting field, increasing application is appeared in our daily life, such as right Light carries out brightness regulation, colour temperature regulation, color adaptation etc..
General color-temperature regulating and tune color all carry out colour mixture control using same-phase PWM, and advantage is simple control method, easily Realize.
But the pwm signal output of same-phase can cause input voltage seriously to fall, and produce compared with large ripple current and stroboscopic Problem, and input power supply can enter overload protection, make the LED cannot normal work.
Chinese patent mandate publication number:CN204062619U, authorizes publication date on December 31st, 2014, discloses a kind of LED Light fixture, including lamp panel, some LED light bars, LED drive dynamic control devices and controlling switches, LED light bar are arranged in lamp panel, LED Lamp bar is made up of LED-baseplate, multiple LED lamp bead, and multiple LED lamp beads are arranged in LED-baseplate, LED drive dynamic control devices with it is many Individual LED lamp bead electrical connection, controlling switch connection control LED drive dynamic control devices, to realize in wall scroll or a plurality of LED light bar The partially or fully switch control of LED lamp bead.There is the deficiency of Voltage Drop in the invention.
The content of the invention
Goal of the invention of the invention be in order to overcome LED same-phase pwm signal of the prior art can cause input electricity A kind of deficiency that pressure is fallen, there is provided control method that can effectively eliminate the LED that Voltage Drop and electric current fall.
To achieve these goals, the present invention uses following technical scheme:
A kind of control method of LED, the LED includes AC/DC converters, single-chip microcomputer, warm white LED string, cool white LED string, red LED lamp string, green light LED lamp string, blue LED lamp string, radio-frequency module and the remote control coordinated with radio-frequency module are filled Put;AC/DC converters respectively with radio-frequency module, single-chip microcomputer, warm white LED string, cool white LED string, red LED lamp string, green glow LED string, blue LED lamp string electrical connection, single-chip microcomputer respectively with radio-frequency module, warm white LED string, cool white LED string, feux rouges LED string, green light LED lamp string, the electrical connection of blue LED lamp string;
Process and switch lamp process are adjusted including colour temperature, the colour temperature regulation process comprises the following steps:
(1-1) remote control sends brightness regulation order to radio-frequency module, and single-chip microcomputer extracts warm from brightness regulation order White luminance value BrWWith cool white brightness value Brc
Remote control sends colour temperature regulating command to radio-frequency module, and single-chip microcomputer is warmed up according to the colour temperature regulating command for receiving The dutycycle W and the dutycycle C of cool white pwm signal of white pwm signal;
(1-2) single-chip microcomputer utilizes formula F actor_W=W/ (C+W), Factor_C=C/ (C+W) to calculate warm white pulsewidth ginseng Number Factor_W, cool white width parameter Factor_C,
Brightness scaled value temp is calculated using formula temp=255 × Br/100;
(1-3) single-chip microcomputer utilizes formula W _ Duty=temp × Factor_W, C_Duty=temp × Factor_C to calculate And obtain warm white color temperature parameters W_Duty, cool white color temperature parameters C_Duty,
The output of (1-4) single-chip microcomputer meets warm white color temperature parameters W_Duty and warm white brightness value BrWWarm white pwm signal to warm White lamp string, single-chip microcomputer output meets cool white color temperature parameters C_Duty and cool white brightness value BrcCool white pwm signal give cool white lamp String;The pulse of warm white pwm signal and cool white pwm signal occurs successively.
Microcontroller serial port sets up communication with radio-frequency module, and radio-frequency module can be received from mobile phone A PP or RF remote Data single-chip microcomputer is issued by serial ports again, finally realize intelligent dimming.By sending different command codes to single-chip microcomputer, can be with Various variation effects of light, such as blended-light of red, green, blue 16,000,000 are realized, three color saltus steps, gradual change, seven color saltus steps, gradual change are equivalent Really, brightness regulation, colour temperature regulation can be realized when adjusting to white light, while colour temperature will not change in degree of lightening, it is bright in color-temperature regulating Angle value will not change.The pulse of warm white pwm signal and cool white pwm signal occurs successively, effectively eliminates Voltage Drop and electric current Fall.
Therefore, the present invention has the regulation for being easy to color, colour temperature and brightness, is capable of achieving various variation effects of light, has The characteristics of effect eliminates Voltage Drop and electric current falls.
Preferably, also including brightness regulation process, comprise the following steps:
Remote control sends brightness regulation order to radio-frequency module, and single-chip microcomputer extracts single-chip microcomputer from brightness regulation order and warms up White luminance value BrW and cool white brightness value Brc, the higher value M in computer selecting BrW and Brc, using formulaCalculate M With the ratio k of present intensity Br, Br is pre-stored within single-chip microcomputer;
W is set to be changed into kW times, C is changed into kC, and single-chip microcomputer is exported and meets dutycycle for the warm white pwm signal of kW gives warm white lamp string, Single-chip microcomputer is exported and meets dutycycle for the cool white pwm signal of kC gives cool white lamp string.
Preferably, during brightness regulation, when single-chip microcomputer output pwm signal is to warm white lamp string or cool white lamp string, will PWM duty cycle value A and current dutyfactor value B in the regulating command for receiving is compared, if A > B, make output The dutycycle of pwm signal is stepped to be increased, untill A≤B;If A < B, make the dutycycle ladder of the pwm signal of output Type reduces, untill A >=B.
Preferably, also including that RGB adjusts process, comprises the following steps:
Remote control sends RGB dimming commands to radio-frequency module, and single-chip microcomputer obtains feux rouges PWM from RGB dimming commands and accounts for Sky ratio, green glow PWM duty cycle and blue light PWM duty cycle, single-chip microcomputer output meet feux rouges PWM duty cycle, green glow PWM duty cycle and 3 road pwm signals of blue light PWM duty cycle, and the pulse of 3 road pwm signals is occurred successively.
Preferably, warm white LED string, cool white LED string, red LED lamp string, green light LED lamp string and blue LED lamp string Include the lamp bead of several series connection.
Preferably, the switch lamp process comprises the following steps:
Remote control sends switch lamp and instructs to radio-frequency module, and single-chip microcomputer judges that current LED is in turn-off still Turn on light state, if switch lamp instruction and current switch lamp state consistency, keep current state constant;
If switch lamp instruction is inconsistent with current switch lamp state, single-chip microcomputer preserves current state, and to warm white LED String, cool white LED string, red LED lamp string, green light LED lamp string, blue LED lamp string send the switch lamp PWM corresponding with instruction Signal.
Preferably, remote control is remote control or mobile phone.
Preferably, radio-frequency module is wifi module, bluetooth module or zigbee modules.
Therefore, the present invention has the advantages that:It is easy to the regulation of color, colour temperature and brightness, is capable of achieving many of light Variation effect is planted, Voltage Drop is effectively eliminated and electric current is fallen.
Brief description of the drawings
Fig. 1 is a kind of theory diagram of the invention;
Fig. 2 is a kind of pwm signal control sequential figure during brightness regulation of the prior art;
Fig. 3 is a kind of pwm signal control sequential figure during RGB regulations of the prior art;
Fig. 4 is a kind of pwm signal control sequential figure in white light dimming process of the invention;
Fig. 5 is a kind of pwm signal control sequential figure in the brightness dimming process of white light of the invention 50%;
Fig. 6 is a kind of pwm signal control sequential figure in the brightness dimming process of cyan of the invention 50%.
In figure:AC/DC converters 1, single-chip microcomputer 2, warm white LED string 3, cool white LED string 4, red LED lamp string 5, green glow LED string 6, blue LED lamp string 7, radio-frequency module 8, remote control 9.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
Embodiment as shown in Figure 1 is a kind of control method of LED, LED include AC/DC converters 1, single-chip microcomputer 2, Warm white LED string 3, cool white LED string 4, red LED lamp string 5, green light LED lamp string 6, blue LED lamp string 7, the and of radio-frequency module 8 The remote control 9 coordinated with radio-frequency module;AC/DC converters respectively with radio-frequency module, single-chip microcomputer, warm white LED string, cool white LED string, red LED lamp string, green light LED lamp string, blue LED lamp string electrical connection, single-chip microcomputer respectively with radio-frequency module, warm white LED string, cool white LED string, red LED lamp string, green light LED lamp string, the electrical connection of blue LED lamp string;Remote control is mobile phone, Radio-frequency module is wifi module.Warm white LED string, cool white LED string, red LED lamp string, green light LED lamp string and blue LED lamp String includes 6 lamp beads of series connection.
Process and switch lamp process are adjusted including colour temperature, colour temperature regulation process comprises the following steps:
Step 100, remote control sends brightness regulation order to radio-frequency module, and single-chip microcomputer is extracted from brightness regulation order Warm white brightness value BrWWith cool white brightness value Brc
Remote control sends colour temperature regulating command to radio-frequency module, and single-chip microcomputer is warmed up according to the colour temperature regulating command for receiving The dutycycle W and the dutycycle C of cool white pwm signal of white pwm signal;
Step 200, single-chip microcomputer utilizes formula F actor_W=W/ (C+W), Factor_C=C/ (C+W) to calculate warm white pulsewidth Parameter Factor_W, cool white width parameter Factor_C,
Brightness scaled value temp is calculated using formula temp=255 × Br/100;
Step 300, single-chip microcomputer utilizes formula W _ Duty=temp × Factor_W, C_Duty=temp × Factor_C meters Warm white color temperature parameters W_Duty, cool white color temperature parameters C_Duty are calculated and obtain,
Step 400, single-chip microcomputer output meets warm white color temperature parameters W_Duty and warm white brightness value BrWWarm white pwm signal Warm white lamp string is given, single-chip microcomputer output meets cool white color temperature parameters C_Duty and cool white brightness value BrcCool white pwm signal to cool white Lamp string;The pulse of warm white pwm signal and cool white pwm signal occurs successively.
Also include brightness regulation process, comprise the following steps:
Remote control sends brightness regulation order to radio-frequency module, and single-chip microcomputer extracts single-chip microcomputer from brightness regulation order and warms up White luminance value BrW and cool white brightness value Brc, the higher value M in computer selecting BrW and Brc, using formulaCalculate M With the ratio k of present intensity Br, Br is pre-stored within single-chip microcomputer;
W is set to be changed into kW times, C is changed into kC, and single-chip microcomputer is exported and meets dutycycle for the warm white pwm signal of kW gives warm white lamp string, Single-chip microcomputer is exported and meets dutycycle for the cool white pwm signal of kC gives cool white lamp string.
During brightness regulation, when single-chip microcomputer output pwm signal is to warm white lamp string or cool white lamp string, the regulation that will be received PWM duty cycle value A and current dutyfactor value B in order is compared, if A > B, make accounting for for the pwm signal of output Sky increases than stepped, untill A≤B;If A < B, make the stepped reduction of dutycycle of the pwm signal of output, until Untill A >=B.
Also include that RGB adjusts process, comprises the following steps:
Remote control sends RGB dimming commands to radio-frequency module, and single-chip microcomputer obtains feux rouges PWM from RGB dimming commands and accounts for Sky ratio, green glow PWM duty cycle and blue light PWM duty cycle, single-chip microcomputer output meet feux rouges PWM duty cycle, green glow PWM duty cycle and 3 road pwm signals of blue light PWM duty cycle, and the pulse of 3 road pwm signals is occurred successively.
Switch lamp process comprises the following steps:
Remote control sends switch lamp and instructs to radio-frequency module, and single-chip microcomputer judges that current LED is in turn-off still Turn on light state, if switch lamp instruction and current switch lamp state consistency, keep current state constant;
If switch lamp instruction is inconsistent with current switch lamp state, single-chip microcomputer preserves current state, and to warm white LED String, cool white LED string, red LED lamp string, green light LED lamp string, blue LED lamp string send the switch lamp PWM corresponding with instruction Signal.
As shown in Figure 2 and Figure 3, in pwm signal control sequential figure of the prior art, the arteries and veins of PWM1 signals and PWM2 signals It is punched in time t1 and occurs simultaneously, the pulse of PWM3 signals, PWM4 signals and PWM5 signals occurs simultaneously in time t1, same to phase The pwm signal output of position can cause input voltage seriously to fall, and cause very big ripple current, produce stroboscopic.More serious feelings Condition can then cause input power supply to enter overload protection, make the LED cannot normal work.
In the present embodiment from the AC/DC converters of 30W/24V, PWM3 control feux rouges, PWM4 control green glows, PWM5 controls Blue light processed;PWM light modulating frequencies are 1KHz (cycle 1ms).
As shown in figure 4, when single-chip microcomputer receive white light output dimmer command after, in a switch periods PWM3, PWM4, PWM5 are sequentially turned on;
As shown in figure 5, after single-chip microcomputer receives the dimmer command of the brightness of white light 50%, in a dimming cycle, PWM3 output 1/6ms high level then turns low level, and PWM4 output 1/6ms high level then turns low level, PWM5 outputs 1/6ms High level then turns low level.
As shown in fig. 6, after single-chip microcomputer receives the dimmer command of cyan (Green Blue synthesis) 50% brightness, at one In dimming cycle, PWM3 output low levels, PWM4 output 1/6ms high level then turns low level, PWM5 output 1/6ms high level Then turn low level.
The pulse of PWM1 signals of the invention and PWM2 signals occurs successively, PWM3 signals, PWM4 signals and PWM5 signals Pulse occur successively, fall so as to effectively eliminate Voltage Drop and electric current.
It should be understood that the present embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.In addition, it is to be understood that Read after the content of instruction of the present invention, those skilled in the art can make various changes or modifications to the present invention, these etc. Valency form equally falls within the application appended claims limited range.

Claims (7)

1. a kind of control method of LED, the LED includes AC/DC converters (1), single-chip microcomputer (2), warm white LED string (3), cool white LED string (4), red LED lamp string (5), green light LED lamp string (6), blue LED lamp string (7), radio-frequency module (8) and The remote control (9) coordinated with radio-frequency module;AC/DC converters respectively with radio-frequency module, single-chip microcomputer, warm white LED string, cool white LED string, red LED lamp string, green light LED lamp string, blue LED lamp string electrical connection, single-chip microcomputer respectively with radio-frequency module, warm white LED string, cool white LED string, red LED lamp string, green light LED lamp string, the electrical connection of blue LED lamp string;It is characterized in that,
Process and switch lamp process are adjusted including colour temperature, the colour temperature regulation process comprises the following steps:
(1-1) remote control sends brightness regulation order to radio-frequency module, and it is bright that single-chip microcomputer extracts warm white from brightness regulation order Angle value BrWWith cool white brightness value Brc
Remote control sends colour temperature regulating command to radio-frequency module, and single-chip microcomputer obtains warm white according to the colour temperature regulating command for receiving The dutycycle W of the pwm signal and dutycycle C of cool white pwm signal;
(1-2) single-chip microcomputer utilizes formula F actor_W=W/ (C+W), Factor_C=C/ (C+W) to calculate warm white width parameter Factor_W, cool white width parameter Factor_C,
Using formula tempW=255 × BrW/ 100 calculate warm white brightness scaled value tempW, using formula tempc=255 × Brc/ 100 calculate cool white brightness scaled value tempc
(1-3) single-chip microcomputer utilizes formula W _ Duty=tempW× Factor_W, C_Duty=tempc× Factor_C is calculated and obtained To warm white color temperature parameters W_Duty, cool white color temperature parameters C_Duty;
The output of (1-4) single-chip microcomputer meets warm white color temperature parameters W_Duty and warm white brightness value BrWWarm white pwm signal give warm white lamp String, single-chip microcomputer output meets cool white color temperature parameters C_Duty and cool white brightness value BrcCool white pwm signal give cool white lamp string;It is warm The pulse of white pwm signal and cool white pwm signal occurs successively;
Also include that RGB adjusts process, comprises the following steps:
Remote control to radio-frequency module send RGB dimming commands, single-chip microcomputer obtained from RGB dimming commands feux rouges PWM duty cycle, Green glow PWM duty cycle and blue light PWM duty cycle, single-chip microcomputer output meet feux rouges PWM duty cycle, green glow PWM duty cycle and blue light 3 road pwm signals of PWM duty cycle, and the pulse of 3 road pwm signals is occurred successively.
2. the control method of LED according to claim 1, it is characterized in that, it is also including brightness regulation process including as follows Step:
Remote control sends brightness regulation order to radio-frequency module, and it is bright that single-chip microcomputer extracts single-chip microcomputer warm white from brightness regulation order Angle value BrW and cool white brightness value Brc, the higher value M in computer selecting BrW and Brc, using formulaCalculate M and work as The ratio k of preceding brightness Br, Br is pre-stored within single-chip microcomputer;
W is set to be changed into kW times, C is changed into kC, and single-chip microcomputer is exported and meets dutycycle for the warm white pwm signal of kW gives warm white lamp string, monolithic Machine is exported and meets dutycycle for the cool white pwm signal of kC gives cool white lamp string.
3. the control method of LED according to claim 2, it is characterized in that, during brightness regulation, single-chip microcomputer output When pwm signal is to warm white lamp string or cool white lamp string, PWM duty cycle value A and current dutycycle in the regulating command that will be received Value B is compared, if A > B, makes the stepped increase of dutycycle of the pwm signal of output, untill A≤B;If A < B, then make the stepped reduction of dutycycle of the pwm signal of output, untill A >=B.
4. the control method of LED according to claim 1, it is characterized in that, it is warm white LED string, cool white LED string, red Light LED string, green light LED lamp string and blue LED lamp string include the lamp bead of several series connection.
5. the control method of LED according to claim 1, it is characterized in that, the switch lamp process comprises the following steps:
Remote control sends switch lamp and instructs to radio-frequency module, and single-chip microcomputer judges that current LED is still turned on light in turn-off State, if switch lamp instruction and current switch lamp state consistency, keep current state constant;
If switch lamp instruction it is inconsistent with current switch lamp state, single-chip microcomputer preservation current state, and to warm white LED string, Cool white LED string, red LED lamp string, green light LED lamp string, blue LED lamp string send the switch lamp PWM letter corresponding with instruction Number.
6. the control method of the LED according to claim 1 or 2 or 3 or 4 or 5, it is characterized in that, remote control is remote control Device or mobile phone.
7. the control method of the LED according to claim 1 or 2 or 3 or 4 or 5, it is characterized in that, radio-frequency module is wifi Module, bluetooth module or zigbee modules.
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