CN204598380U - A kind of LED colour temperature adjusting device based on single channel PWM - Google Patents
A kind of LED colour temperature adjusting device based on single channel PWM Download PDFInfo
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- CN204598380U CN204598380U CN201520204015.XU CN201520204015U CN204598380U CN 204598380 U CN204598380 U CN 204598380U CN 201520204015 U CN201520204015 U CN 201520204015U CN 204598380 U CN204598380 U CN 204598380U
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses 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 LED1, and described cool colour temperature ON-OFF control circuit is connected with cool colour temperature LED LED2.The utility model structure is simple, implement more simple, reliable, and can effective enhancing resource utility rate, the amplitude of variation of two paths of LED brightness can be made consistent simultaneously, thus brightness remains unchanged when making colour temperature regulate, the colour temperature regulated can consecutive variations, effectively increases colour temperature adjustable range, enhances the practical effect of LED colour temperature change.The utility model can be widely used in LED field.
Description
Technical field
The utility model relates to LED technology field, particularly relates to a kind of LED colour temperature adjusting device based on single channel PWM.
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.
Utility model content
In order to solve the problems of the technologies described above, the purpose of this utility model is to provide one can improve control precision, and can strengthen a kind of LED colour temperature adjusting device based on single channel PWM of colour temperature adjustable range.
The technical scheme that the utility model adopts 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.
The beneficial effects of the utility model are:
A kind of LED colour temperature adjusting device structure based on single channel PWM is 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, embodiment of the present utility model 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 utility model;
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 utility model;
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 utility model.
Embodiment
With reference to figure 1, a kind of LED colour temperature adjusting device based on single channel PWM of the utility model, 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 utility model embodiment, 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.
From foregoing, a kind of LED colour temperature adjusting device structure based on single channel PWM is 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 utility model is illustrated, but the utility model is created and 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 the utility model spirit, and these equivalent distortion or replacement are all included in the application's claim limited range.
Claims (4)
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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520204015.XU CN204598380U (en) | 2015-04-07 | 2015-04-07 | A kind of LED colour temperature adjusting device based on single channel PWM |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520204015.XU CN204598380U (en) | 2015-04-07 | 2015-04-07 | A kind of LED colour temperature adjusting device based on single channel PWM |
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| CN204598380U true CN204598380U (en) | 2015-08-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104797047A (en) * | 2015-04-07 | 2015-07-22 | 浙江嘉乐智能技术有限公司 | LED color temperature adjusting device and method based on single-channel PWM (pulse width modulation) |
| 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 |
-
2015
- 2015-04-07 CN CN201520204015.XU patent/CN204598380U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104797047A (en) * | 2015-04-07 | 2015-07-22 | 浙江嘉乐智能技术有限公司 | LED color temperature adjusting device and method based on single-channel PWM (pulse width modulation) |
| 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 |
| CN107484299B (en) * | 2017-09-11 | 2024-04-19 | 四川蓝景光电技术有限责任公司 | LED lamp brightness and color temperature adjusting control circuit based on one-way PWM and implementation method thereof |
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