CN104797047A - LED color temperature adjusting device and method based on single-channel PWM (pulse width modulation) - Google Patents
LED color temperature adjusting device and method based on single-channel PWM (pulse width modulation) Download PDFInfo
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- CN104797047A CN104797047A CN201510160986.3A CN201510160986A CN104797047A CN 104797047 A CN104797047 A CN 104797047A CN 201510160986 A CN201510160986 A CN 201510160986A CN 104797047 A CN104797047 A CN 104797047A
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Abstract
The invention discloses an LED color temperature adjusting device and method based on single-channel PWM (pulse width modulation). The LED color temperature adjusting device comprises a microprocessor, a warm color temperature switch control circuit, a cold color temperature switch control circuit, a warm color temperature LED lamp and a cold color temperature LED lamp. The method includes: respectively inputting preset-frequency PWM signals to the warm color temperature switch control circuit and the cold color temperature switch control circuit; according to the input PWM signals, controlling brightness of the warm color temperature LED lamp and the cold color temperature LED lamp which are connected with the warm color temperature switch control circuit and the cold color temperature switch control circuit respectively by the same. The LED color temperature adjusting device is simple in structure, the method is simpler and more reliable in realization, resource using efficiency can be improved effectively, and changing amplitude of brightness of the LED lamps can be uniform, so that brightness can be maintained unchanged when color temperature is adjusted; adjusted color temperature can change continuously, so that color temperature adjusting range is effectively expanded, and actual using effect of LED color temperature changing is improved. The LED color temperature adjusting device and method can be widely applied in the field of LEDs.
Description
Technical field
The present invention relates to LED technology field, particularly relate to a kind of LED colour temperature adjusting device based on single channel PWM and method thereof.
Background technology
The technology of current adjustment LED colour temperature, mainly utilizes two passage PWM to control separately two paths of LED respectively, reduces another road PWM duty ratio, thus reach the adjustment to colour temperature while increasing by a road PWM duty ratio.
But, colour temperature is regulated by binary channels PWM, when the duty ratio of software control PWM, the shading process of two passage PWM can not all values in realization theory, and only achievement unit can divide specific region, thus the colour temperature regulated can not consecutive variations, when colour temperature regulates, LED luminance also can be made to change.
Summary of the invention
In order to solve the problems of the technologies described above, the object of this invention is to provide one can improve control precision, and can strengthen a kind of LED colour temperature adjusting device based on single channel PWM and the method thereof of colour temperature adjustable range.
The technical solution adopted in the present invention is:
A kind of LED colour temperature adjusting device based on single channel PWM, comprise microprocessor, warm colour temperature ON-OFF control circuit, cool colour temperature ON-OFF control circuit, warm colour temperature LED and cool colour temperature LED, the output of described microprocessor is connected with the input of warm colour temperature ON-OFF control circuit and the input of cool colour temperature ON-OFF control circuit respectively, described warm colour temperature ON-OFF control circuit is connected with warm colour temperature LED, and described cool colour temperature ON-OFF control circuit is connected with cool colour temperature LED.
As the further improvement of described a kind of LED colour temperature adjusting device based on single channel PWM, described warm colour temperature ON-OFF control circuit comprises the first resistance, second resistance, 3rd resistance, the first transistor and PMOS, the output of described microprocessor is connected with the base stage of the first transistor by the first resistance, the collector electrode of described the first transistor is connected with power end by the second resistance, the collector electrode of described the first transistor is connected with the grid of PMOS by the 3rd resistance, the drain electrode of described PMOS is connected with the negative pole end of warm colour temperature LED, the emitter of described the first transistor and the source electrode of PMOS are all connected to ground.
As the further improvement of described a kind of LED colour temperature adjusting device based on single channel PWM, described cool colour temperature ON-OFF control circuit comprises the 4th resistance, 5th resistance, 6th resistance, transistor seconds and NMOS tube, the output of described microprocessor is connected with the base stage of transistor seconds by the 4th resistance, the collector electrode of described transistor seconds is connected with power end by the 5th resistance, the collector electrode of described transistor seconds is connected with the grid of NMOS tube by the 6th resistance, the drain electrode of described PMOS is connected with the negative pole end of cool colour temperature LED, the emitter of described transistor seconds and the source electrode of NMOS tube are all connected to ground.
As the further improvement of described a kind of LED colour temperature adjusting device based on single channel PWM, described the first transistor and transistor seconds are NPN transistor.
Another technical scheme of the present invention is:
Based on a LED color temperature adjusting method of single channel PWM, comprise the following steps:
S1, respectively to warm colour temperature ON-OFF control circuit and cool colour temperature ON-OFF control circuit input predeterminated frequency pwm signal;
S2, according to input pwm signal, described warm colour temperature ON-OFF control circuit carries out brilliance control to coupled warm colour temperature LED, and described cool colour temperature ON-OFF control circuit carries out brilliance control to coupled cool colour temperature LED.
As the further improvement of described a kind of LED color temperature adjusting method based on single channel PWM, be also provided with before described step S1:
The pwm signal of S0, generation predeterminated frequency.
As the further improvement of described a kind of LED color temperature adjusting method based on single channel PWM, described step S0 comprises:
S01, initialization is carried out to Interruption number of times, give initial value to it;
S02, carry out from adding 1, judging the cycle interruption number of times whether Interruption number of times equals default to Interruption number of times, if so, then by Interruption number of times zero with control output high level, and perform step S03; Otherwise, then step S03 is performed;
S03, judge the high level pulse number whether Interruption number of times equals default if so, then to control output low level, and return and perform step S02; Otherwise, then continue to export high level, and return execution step S02.
As the further improvement of described a kind of LED color temperature adjusting method based on single channel PWM, described warm colour temperature ON-OFF control circuit carries out brilliance control to coupled warm colour temperature LED, and it is specially: described warm colour temperature ON-OFF control circuit controls warm colour temperature LED according to the high level of a clock cycle in pwm signal and opens.
As the further improvement of described a kind of LED color temperature adjusting method based on single channel PWM, described cool colour temperature ON-OFF control circuit carries out brilliance control to coupled cool colour temperature LED, and it is specially: described cool colour temperature ON-OFF control circuit is opened according to the low level control cool colour temperature LED of a clock cycle in pwm signal.
The invention has the beneficial effects as follows:
A kind of LED colour temperature adjusting device based on single channel PWM and method structure simple, the control of LED colour temperature is carried out by using single channel PWM, avoid the precision problem brought when two-way PWM controls, make to implement more simple, reliable, and can the service efficiency of effective elevator system resource, control to make the amplitude of variation of two paths of LED brightness consistent by single channel simultaneously, thus brightness remains unchanged when making colour temperature regulate, the colour temperature regulated can consecutive variations, effective increase colour temperature adjustable range, enhances the practical effect of LED colour temperature change.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Fig. 1 is the functional-block diagram of a kind of LED colour temperature adjusting device based on single channel PWM of the present invention;
Fig. 2 is the circuit theory diagrams of a kind of LED colour temperature adjusting device warm colour temperature ON-OFF control circuit based on single channel PWM of the present invention;
Fig. 3 is the circuit theory diagrams of a kind of LED colour temperature adjusting device cool colour temperature ON-OFF control circuit based on single channel PWM of the present invention;
Fig. 4 is the flow chart of steps of a kind of LED color temperature adjusting method based on single channel PWM of the present invention.
Embodiment
With reference to figure 1, a kind of LED colour temperature adjusting device based on single channel PWM of the present invention, comprise microprocessor, warm colour temperature ON-OFF control circuit, cool colour temperature ON-OFF control circuit, warm colour temperature LED LED1 and cool colour temperature LED LED2, the output of described microprocessor is connected with the input of warm colour temperature ON-OFF control circuit and the input of cool colour temperature ON-OFF control circuit respectively, described warm colour temperature ON-OFF control circuit is connected with warm colour temperature LED LED1, and described cool colour temperature ON-OFF control circuit is connected with cool colour temperature LED LED2.
With reference to figure 2, as the further improvement of described a kind of LED colour temperature adjusting device based on single channel PWM, described warm colour temperature ON-OFF control circuit comprises the first resistance R1, second resistance R2, 3rd resistance R3, the first transistor Q1 and PMOS PM, the output of described microprocessor is connected with the base stage of the first transistor Q1 by the first resistance R1, the collector electrode of described the first transistor Q1 is connected with power end by the second resistance R2, the collector electrode of described the first transistor Q1 is connected with the grid of PMOS PM by the 3rd resistance R3, the drain electrode of described PMOS PM is connected with the negative pole end of warm colour temperature LED LED1, the described emitter of the first transistor Q1 and the source electrode of PMOS PM are all connected to ground.
With reference to figure 3, as the further improvement of described a kind of LED colour temperature adjusting device based on single channel PWM, described cool colour temperature ON-OFF control circuit comprises the 4th resistance R4, 5th resistance R5, 6th resistance R6, transistor seconds Q2 and NMOS tube NM, the output of described microprocessor is connected with the base stage of transistor seconds Q2 by the 4th resistance R4, the collector electrode of described transistor seconds Q2 is connected with power end by the 5th resistance R5, the collector electrode of described transistor seconds Q2 is connected with the grid of NMOS tube NM by the 6th resistance R6, the drain electrode of described PMOS PM is connected with the negative pole end of cool colour temperature LED LED2, the described emitter of transistor seconds Q2 and the source electrode of NMOS tube NM are all connected to ground.
As the further improvement of described a kind of LED colour temperature adjusting device based on single channel PWM, described the first transistor Q1 and transistor seconds Q2 is NPN transistor.
In the embodiment of the present invention, the positive terminal of warm colour temperature LED LED1 is all connected constant-current source with the positive terminal of cool colour temperature LED LED2, power end is 5V, when the high level in the clock cycle in pwm signal is input to warm colour temperature ON-OFF control circuit, the first transistor Q1 conducting in warm colour temperature ON-OFF control circuit, output low level to the grid of PMOS PM, PMOS PM conducting, thus warm colour temperature LED LED1 conducting lights; When the low level in the clock cycle in pwm signal is input to warm colour temperature ON-OFF control circuit, the first transistor Q1 in warm colour temperature ON-OFF control circuit ends, export the grid of high level to PMOS PM, PMOS PM ends, and warm colour temperature LED LED1 extinguishes; Therefore, the brightness by regulating the high level time in the pulse period of PWM how much can change warm colour temperature LED LED1.
When the low level in the clock cycle in pwm signal is input to cool colour temperature ON-OFF control circuit, transistor seconds Q2 in cool colour temperature ON-OFF control circuit ends, export the grid of high level to NMOS tube NM, NMOS tube NM conducting, thus cool colour temperature LED LED2 conducting lights; When the high level in the clock cycle in pwm signal is input to cool colour temperature ON-OFF control circuit, transistor seconds Q2 conducting in cool colour temperature ON-OFF control circuit, output low level is to the grid of NMOS tube NM, and NMOS tube NM ends, and cool colour temperature LED LED2 extinguishes; Therefore, the brightness by regulating the low level time in the pulse period of PWM how much can change cool colour temperature LED LED2.
With reference to figure 4, a kind of LED color temperature adjusting method based on single channel PWM of the present invention, comprises the following steps:
S1, respectively to warm colour temperature ON-OFF control circuit and cool colour temperature ON-OFF control circuit input predeterminated frequency pwm signal;
S2, according to input pwm signal, described warm colour temperature ON-OFF control circuit carries out brilliance control to coupled warm colour temperature LED LED1, and described cool colour temperature ON-OFF control circuit carries out brilliance control to coupled cool colour temperature LED LED2.
As the further improvement of described a kind of LED color temperature adjusting method based on single channel PWM, be also provided with before described step S1:
The pwm signal of S0, generation predeterminated frequency.
As the further improvement of described a kind of LED color temperature adjusting method based on single channel PWM, described step S0 comprises:
S01, initialization is carried out to Interruption number of times, give initial value to it;
S02, carry out from adding 1, judging the cycle interruption number of times whether Interruption number of times equals default to Interruption number of times, if so, then by Interruption number of times zero with control output high level, and perform step S03; Otherwise, then step S03 is performed;
S03, judge the high level pulse number whether Interruption number of times equals default if so, then to control output low level, and return and perform step S02; Otherwise, then continue to export high level, and return execution step S02.
Wherein, the time of low and high level in one-period can be controlled by setting high level pulse number, thus realize the adjustment of different brackets LED colour temperature.
As the further improvement of described a kind of LED color temperature adjusting method based on single channel PWM, described warm colour temperature ON-OFF control circuit carries out brilliance control to coupled warm colour temperature LED LED1, and it is specially: described warm colour temperature ON-OFF control circuit controls warm colour temperature LED LED1 according to the high level of a clock cycle in pwm signal and opens.
As the further improvement of described a kind of LED color temperature adjusting method based on single channel PWM, described cool colour temperature ON-OFF control circuit carries out brilliance control to coupled cool colour temperature LED LED2, and it is specially: described cool colour temperature ON-OFF control circuit is opened according to the low level control cool colour temperature LED LED2 of a clock cycle in pwm signal.
From foregoing, a kind of LED colour temperature adjusting device based on single channel PWM and method structure simple, the control of LED colour temperature is carried out by using single channel PWM, avoid the precision problem brought when two-way PWM controls, make to implement simpler, reliably, and can the service efficiency of effective elevator system resource, control to make the amplitude of variation of two paths of LED brightness consistent by single channel simultaneously, thus brightness remains unchanged when making colour temperature regulate, the colour temperature regulated can consecutive variations, effective increase colour temperature adjustable range, enhance the practical effect of LED colour temperature change.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent distortion or replacement are all included in the application's claim limited range.
Claims (9)
1. the LED colour temperature adjusting device based on single channel PWM, it is characterized in that: comprise microprocessor, warm colour temperature ON-OFF control circuit, cool colour temperature ON-OFF control circuit, warm colour temperature LED (LED1) and cool colour temperature LED (LED2), the output of described microprocessor is connected with the input of warm colour temperature ON-OFF control circuit and the input of cool colour temperature ON-OFF control circuit respectively, described warm colour temperature ON-OFF control circuit is connected with warm colour temperature LED (LED1), and described cool colour temperature ON-OFF control circuit is connected with cool colour temperature LED (LED2).
2. a kind of LED colour temperature adjusting device based on single channel PWM according to claim 1, it is characterized in that: described warm colour temperature ON-OFF control circuit comprises the first resistance (R1), second resistance (R2), 3rd resistance (R3), the first transistor (Q1) and PMOS (PM), the output of described microprocessor is connected with the base stage of the first transistor (Q1) by the first resistance (R1), the collector electrode of described the first transistor (Q1) is connected with power end by the second resistance (R2), the collector electrode of described the first transistor (Q1) is connected with the grid of PMOS (PM) by the 3rd resistance (R3), the drain electrode of described PMOS (PM) is connected with the negative pole end of warm colour temperature LED (LED1), the emitter of described the first transistor (Q1) and the source electrode of PMOS (PM) are all connected to ground.
3. a kind of LED colour temperature adjusting device based on single channel PWM according to claim 2, it is characterized in that: described cool colour temperature ON-OFF control circuit comprises the 4th resistance (R4), 5th resistance (R5), 6th resistance (R6), transistor seconds (Q2) and NMOS tube (NM), the output of described microprocessor is connected with the base stage of transistor seconds (Q2) by the 4th resistance (R4), the collector electrode of described transistor seconds (Q2) is connected with power end by the 5th resistance (R5), the collector electrode of described transistor seconds (Q2) is connected with the grid of NMOS tube (NM) by the 6th resistance (R6), the drain electrode of described PMOS (PM) is connected with the negative pole end of cool colour temperature LED (LED2), the emitter of described transistor seconds (Q2) and the source electrode of NMOS tube (NM) are all connected to ground.
4. a kind of LED colour temperature adjusting device based on single channel PWM according to claim 3, is characterized in that: described the first transistor (Q1) and transistor seconds (Q2) are NPN transistor.
5., based on a LED color temperature adjusting method of single channel PWM, it is characterized in that, comprise the following steps:
S1, respectively to warm colour temperature ON-OFF control circuit and cool colour temperature ON-OFF control circuit input predeterminated frequency pwm signal;
S2, according to input pwm signal, described warm colour temperature ON-OFF control circuit carries out brilliance control to coupled warm colour temperature LED (LED1), and described cool colour temperature ON-OFF control circuit carries out brilliance control to coupled cool colour temperature LED (LED2).
6. a kind of LED color temperature adjusting method based on single channel PWM according to claim 5, is characterized in that, be also provided with before described step S1:
The pwm signal of S0, generation predeterminated frequency.
7. a kind of LED color temperature adjusting method based on single channel PWM according to claim 6, it is characterized in that, described step S0 comprises:
S01, initialization is carried out to Interruption number of times, give initial value to it;
S02, carry out from adding 1, judging the cycle interruption number of times whether Interruption number of times equals default to Interruption number of times, if so, then by Interruption number of times zero with control output high level, and perform step S03; Otherwise, then step S03 is performed;
S03, judge the high level pulse number whether Interruption number of times equals default if so, then to control output low level, and return and perform step S02; Otherwise, then continue to export high level, and return execution step S02.
8. a kind of LED color temperature adjusting method based on single channel PWM according to claim 5, it is characterized in that: described warm colour temperature ON-OFF control circuit carries out brilliance control to coupled warm colour temperature LED (LED1), and it is specially: described warm colour temperature ON-OFF control circuit controls warm colour temperature LED (LED1) according to the high level of a clock cycle in pwm signal and opens.
9. a kind of LED color temperature adjusting method based on single channel PWM according to claim 5, it is characterized in that, described cool colour temperature ON-OFF control circuit carries out brilliance control to coupled cool colour temperature LED (LED2), and it is specially: described cool colour temperature ON-OFF control circuit is opened according to low level control cool colour temperature LED (LED2) of a clock cycle in pwm signal.
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| CN105025635A (en) * | 2015-07-31 | 2015-11-04 | 浙江嘉乐智能技术有限公司 | Light emitting diode (LED) dimming color temperature adjusting circuit |
| CN105182294A (en) * | 2015-09-15 | 2015-12-23 | 浙江嘉乐智能技术有限公司 | Wireless-control-based radar equipment adjusting device and method |
| CN105764189A (en) * | 2016-03-25 | 2016-07-13 | 上海三思科技发展有限公司 | LED illumination system and illumination control method thereof |
| CN107484299A (en) * | 2017-09-11 | 2017-12-15 | 四川蓝景光电技术有限责任公司 | LED degree of lightening toning temperature control circuit and its implementation method based on single channel PWM |
| CN113507764A (en) * | 2020-09-22 | 2021-10-15 | 瑞森半导体科技(广东)有限公司 | Technology for realizing remote light modulation and color temperature modulation through non-contact action |
| CN114340099A (en) * | 2022-01-26 | 2022-04-12 | 嘉善枝晟家具科技有限公司 | Desk lamp and control method of color temperature of desk lamp |
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| CN113507764A (en) * | 2020-09-22 | 2021-10-15 | 瑞森半导体科技(广东)有限公司 | Technology for realizing remote light modulation and color temperature modulation through non-contact action |
| CN114340099A (en) * | 2022-01-26 | 2022-04-12 | 嘉善枝晟家具科技有限公司 | Desk lamp and control method of color temperature of desk lamp |
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Application publication date: 20150722 |