CN203399360U - PWM light-adjusting LED device based on temperature control - Google Patents
PWM light-adjusting LED device based on temperature control Download PDFInfo
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- CN203399360U CN203399360U CN201320427938.2U CN201320427938U CN203399360U CN 203399360 U CN203399360 U CN 203399360U CN 201320427938 U CN201320427938 U CN 201320427938U CN 203399360 U CN203399360 U CN 203399360U
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Abstract
The utility model discloses a PWM light-adjusting LED device based on temperature control. Brightness of LED lighting lamps can be set through programming, and, after setting, a drive circuit can adjust the brightness of LEDs according to temperature of the lamps. A temperature sensor acquires lamp temperature parameters and feeds the lamp temperature parameters back to a micro-control unit; and the micro-control unit adjusts the duty ratio of PWM according to the temperature parameters, thus adjusting a MOS switch tube to control a forward current through the LEDs, and then temperature of the LED device is adjusted. The LED elements are prevented from service life reduction caused by excess temperature, and reliability of the LED device is improved.
Description
Technical field
The utility model relates to LED technical field, relates in particular to a kind of based on temperature controlled PWM light modulation LED apparatus.
Background technology
LED a kind ofly can change electric energy into the light emitting semiconductor device of luminous energy, belongs to typical green illumination light source, have that the life-span is long, start-up time is short, without ultraviolet, rich color is full, can do the features such as full-color variation, low-voltage safety.Along with LED lamp is applied in public illumination field more and more widely with advantages such as its efficient energy-saving, life-span length, there is greatly the trend of traditional lighting light fixtures such as replacing incandescent lamp, fluorescent lamp.
But in LED industry development process, especially in the application of great power LED, but the technical bottlenecks such as light decay, life-span, heat radiation have been run into, the rising of LED matrix temperature, will cause the LED life-span to be reduced, also can accelerate the light decay of LED, affect efficiency and the reliability of the elements such as LED driver, the efficiency reliability of LED driving power is had higher requirement.Therefore heat dissipation design becomes important topic of LED matrix and difficult point.
Summary of the invention
For prior art Shortcomings, it is a kind of based on temperature controlled PWM light modulation LED apparatus that the utility model provides, comprise temperature sensor, micro-control unit, MOS switching tube, LED lamp group and LED driving power, the output of described MOS switching tube is connected with described LED lamp group, its input connects the output of micro-control unit, and the input of described micro-control unit is connected with the output of temperature sensor.
Further, described temperature sensor, micro-control unit, MOS switching tube are incorporated in described LED driving power circuit.
Further, also comprise heat abstractor, described temperature sensor (1) contacts with this heat abstractor.
Of the present utility modelly based on temperature controlled PWM dimming LED (Light Emitting Diode) dress, can adjust the luminous brightness of LED according to temperature, thereby regulate LED matrix temperature, scientific structure.
Accompanying drawing explanation
Fig. 1 is the functional-block diagram based on temperature controlled PWM light modulation LED apparatus of the present utility model;
In figure: 1-temperature sensor, 2-micro-control unit, 3-MOS switching tube, 4-LED lamp group, 5-LED driving power.
Embodiment
Describe with reference to the accompanying drawings the utility model below in detail, it is more obvious that the purpose of this utility model and effect will become.
Embodiment mono-:
As shown in Figure 1, the utility model is a kind of based on temperature controlled PWM light modulation LED apparatus, comprising: temperature sensor 1, micro-control unit 2, MOS switching tube 3, LED lamp group 4, LED driving power 5.MOS switching tube 3 outputs are connected with LED lamp group 4, and input connects micro-control unit 2 outputs, and the input of micro-control unit 2 is connected with the output of temperature sensor 1.Described temperature sensor 1, micro-control unit 2, MOS switching tube 3 are incorporated in same LED driving power 5 circuit.By program setting, the brightness of LED illuminating lamp is set, set rear LED driving power 5 and can regulate according to the temperature of light fixture the brightness of LED lamp group 4.Temperature sensor 1 collects lamp temperatures parameter, and feeds back to micro-control unit 2, and micro-control unit regulates the duty ratio of PWM according to temperature parameter, thereby regulates MOS switching tube 3 to control the forward current that flows through LED lamp group 4, and then regulates the temperature of LED matrix.
Operation principle of the present utility model is as follows:
For convenience of description, in the present embodiment, by micro-control unit 2 is carried out to program setting, set three temperature threshold T1, T2, T3 and T1 < T2 < T3, the detected temperature of temperature sensor 1 is T0, and T0 is that the variation with caloric value and heat dissipation capacity changes.
A, when T0 < T1, the PWM duty ratio of micro-control unit 2 output is 100%, and then regulates MOS switching tube 3, LED lamp group 4 is operated under normal brightness.
B, when T1 < T0 < T2, the PWM duty ratio of micro-control unit 2 output is 90%, accordingly, regulates MOS pipe 3, the LED lamp group 4 of opening the light to be operated under 90% brightness.
C, when T2 < T0 < T3, the PWM duty ratio of micro-control unit 2 output is 15%, accordingly, regulates MOS switching tube 3, LED lamp group 4 is operated under 15% brightness.
D, when T3 < T0, the PWM duty ratio 0% of micro-control unit 2 output, accordingly, regulates MOS switching tube 3, LED lamp group 4 is extinguished, LED matrix is not luminous.
Along with flowing through, the electric current of LED lamp group 4 reduces and the reduction of brightness, and temperature T 0 reduces, and the brightness meeting of LED lamp group 4 increases again.Further, when the number of temperature threshold is enough large, the variations in temperature of LED matrix is meticulousr, thereby makes temperature T 0 reach stable in certain value, now, heat dissipation capacity and the caloric value of LED matrix reach balance, visible, the temperature that the micro-control unit 2 in this example can detect according to temperature sensor 1, determine luminosity, thereby regulate the temperature of LED matrix of the present utility model, avoid reducing because excess Temperature makes LED component life, improve the reliability of LED matrix.
Embodiment bis-:
The difference of the present embodiment and embodiment mono-is that the LED matrix of this enforcement is provided with heat abstractor, and described temperature sensor 1 is connected with this heat abstractor and contacts good.The other technologies feature of the present embodiment is identical with embodiment mono-, does not repeat them here.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection range; although the utility model has been done to explain with reference to preferred embodiments; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of the technical solution of the utility model.
Claims (3)
1. one kind based on temperature controlled PWM light modulation LED apparatus, comprise temperature sensor (1), micro-control unit (2), MOS switching tube (3), LED lamp group (4) and LED driving power (5), it is characterized in that: the output of described MOS switching tube (3) is connected with described LED lamp group (4), its input connects the output of micro-control unit (2), and the input of described micro-control unit (3) is connected with the output of temperature sensor (1).
2. according to claim 1 based on temperature controlled PWM light modulation LED apparatus, it is characterized in that: described temperature sensor (1), micro-control unit (2), MOS switching tube (3) are incorporated in described LED driving power circuit (5).
3. according to claim 1 based on temperature controlled PWM light modulation LED apparatus, it is characterized in that: also comprise heat abstractor, described temperature sensor (1) contacts with this heat abstractor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320427938.2U CN203399360U (en) | 2013-07-18 | 2013-07-18 | PWM light-adjusting LED device based on temperature control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320427938.2U CN203399360U (en) | 2013-07-18 | 2013-07-18 | PWM light-adjusting LED device based on temperature control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203399360U true CN203399360U (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320427938.2U Expired - Fee Related CN203399360U (en) | 2013-07-18 | 2013-07-18 | PWM light-adjusting LED device based on temperature control |
Country Status (1)
| Country | Link |
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| CN (1) | CN203399360U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105050263A (en) * | 2015-07-15 | 2015-11-11 | 广东融能科技有限公司 | Time-sharing automatic dimming system and method for light-emitting diode (LED) street lamp |
| CN109041383A (en) * | 2018-08-31 | 2018-12-18 | 华勤通讯技术有限公司 | The control method and system of flash lamp in mobile terminal |
-
2013
- 2013-07-18 CN CN201320427938.2U patent/CN203399360U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105050263A (en) * | 2015-07-15 | 2015-11-11 | 广东融能科技有限公司 | Time-sharing automatic dimming system and method for light-emitting diode (LED) street lamp |
| CN109041383A (en) * | 2018-08-31 | 2018-12-18 | 华勤通讯技术有限公司 | The control method and system of flash lamp in mobile terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140115 Termination date: 20140718 |
|
| EXPY | Termination of patent right or utility model |