CN203072209U - LED light flux automatic adjusting device - Google Patents
LED light flux automatic adjusting device Download PDFInfo
- Publication number
- CN203072209U CN203072209U CN 201220719979 CN201220719979U CN203072209U CN 203072209 U CN203072209 U CN 203072209U CN 201220719979 CN201220719979 CN 201220719979 CN 201220719979 U CN201220719979 U CN 201220719979U CN 203072209 U CN203072209 U CN 203072209U
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- China
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- lamp group
- led lamp
- central controller
- triode
- led
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- Expired - Lifetime
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Abstract
The utility model relates to an LED light flux automatic adjusting device. The LED light flux automatic adjusting device comprises a power supply, an LED lamp group, a temperature sensor which is arranged on the LED lamp group, a central controller and a triode Q1 which is used for controlling on and off of the LED lamp group. The power supply is respectively connected with the LED lamp group, the temperature sensor and the central controller to provide power supply. The output end of the temperature sensor is connected with the input end of the central controller. A PWM signal output by the central controller is connected with the base electrode of the triode Q1. A resistor R3 is connected between the base electrode of the triode Q1 and the power supply. The emitting electrode of the triode Q1 is grounded, and the collector electrode is connected with the LED lamp group through a resistor R2. According to the utility model, with the change of the temperature of the LED lamp group, the duty ratio output by the PWM signal of LED drive current is changed, thus the brightness of the LED lamp group is changed.
Description
Technical field
The utility model relates to a kind of LED luminous flux automatic regulating equipment, belongs to LED car light control technology field.
Background technology
Along with the LED(light-emitting diode) the continuous development of technology, the application of LED more and more widely, particularly in automobile lamp and illumination lighting engineering field.But LED can cause the inconsistent of its working temperature owing to reasons such as its applied environment and self-heatings, and therefore has influence on the luminous flux of its output.
At present at the LED working temperature research of the influence of LED luminous flux is mainly concentrated on how to suppress light decay when temperature is too high, and mainly adopt the method for various heat radiations that the working temperature of LED is descended.But at car light or be exposed to some LED light fixtures in the environment, although radiator portion is done well, but owing to be subjected to extraneous thermal impact bigger, very big to the influence of the LED working temperature in the light fixture as the bulb in ambient temperature, solar light irradiation or the car light, as control temperature when low, can cause the luminous intensity distribution superbright; And the control temperature can cause luminous intensity distribution not up to standard again when higher.
Summary of the invention
The utility model purpose provides a kind of LED luminous flux automatic regulating equipment, can change the duty ratio of the pwm signal output of LED drive current along with LED lamp group variations in temperature, thereby changes the brightness of LED lamp group.
The utility model is that the technical scheme that achieves the above object is: a kind of LED luminous flux automatic regulating equipment, it is characterized in that: comprise power supply, LED lamp group, be installed in the temperature sensor on the LED lamp group, central controller and the triode Q1 that is used for control LED lamp group break-make, power supply respectively with LED lamp group, temperature sensor is connected to provide power supply with central controller, the input of the output termination central controller of temperature sensor, the pwm signal of central controller output connects the base stage of triode Q1, and be connected to resistance R 3 between the base stage of triode Q1 and the power supply, the grounded emitter of triode Q1, collector electrode connects LED lamp group by resistance R 2.
The utility model inputs to central controller with the detected LED lamp of temperature sensor group working temperature data, central controller obtains the duty ratio of luminous flux and the pwm signal of its output according to the working temperature of LED lamp group, the duty ratio of central controller output pwm signal is also controlled the break-make of triode Q1, so can change the pwm signal of LED lamp group drive current along with variations in temperature, the luminous flux of LED lamp group output can be adjusted automatically along with the variation of its working temperature, thereby make LED can not influence luminous intensity distribution performance because of its operational environment.
Description of drawings
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.
Fig. 1 is the structural representation of the utility model LED luminous flux automatic regulating equipment.
Embodiment
See shown in Figure 1, the utility model LED luminous flux automatic regulating equipment, comprise power supply, LED lamp group, be installed in the temperature sensor on the LED lamp group, central controller and the triode Q1 that is used for control LED lamp group break-make, LED lamp group forms series parallel structure by a plurality of LED, central controller adopts single-chip microcomputer, as the AT series monolithic, or STC series monolithic, it can also be the AVR series monolithic, power supply respectively with LED lamp group, temperature sensor is connected to provide power supply with central controller, the input of the output termination central controller of temperature sensor, be connected to resistance R 4 between the power end of temperature sensor and the output, the pwm signal of central controller output connects the base stage of triode Q1, and be connected to resistance R 3 between the base stage of triode Q1 and the power supply, the grounded emitter of triode Q1, collector electrode connects LED lamp group by resistance R 2.The utility model central controller stores the linear relationship of the duty ratio of the working temperature of LED lamp group and pwm signal, make the working temperature of the LED lamp group that central controller gathers according to temperature sensor export the duty ratio of corresponding pwm signal, break-make with control triode Q1, make LED lamp group can change the duty ratio of the pwm signal of LED lamp group drive current along with the variation of its working temperature, so the luminous flux of LED lamp group output is adjusted automatically along with its temperature change.When LED lamp group working temperature is low, can reduces the duty ratio of the pwm signal of drive current, thereby reduce the luminous flux of LED lamp group output; When LED lamp group working temperature is higher, increases the duty ratio of the pwm signal of drive current, thereby increase the luminous flux of LED lamp group output.
Claims (2)
1. LED luminous flux automatic regulating equipment, it is characterized in that: comprise power supply, LED lamp group, be installed in the temperature sensor on the LED lamp group, central controller and the triode Q1 that is used for control LED lamp group break-make, power supply respectively with LED lamp group, temperature sensor is connected to provide power supply with central controller, the input of the output termination central controller of temperature sensor, the pwm signal of central controller output connects the base stage of triode Q1, and be connected to resistance R 3 between the base stage of triode Q1 and the power supply, the grounded emitter of triode Q1, collector electrode connects LED lamp group by resistance R 2.
2. LED luminous flux automatic regulating equipment according to claim 1 is characterized in that: be connected to resistance R 4 between the power end of described temperature sensor and the output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220719979 CN203072209U (en) | 2012-12-24 | 2012-12-24 | LED light flux automatic adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220719979 CN203072209U (en) | 2012-12-24 | 2012-12-24 | LED light flux automatic adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203072209U true CN203072209U (en) | 2013-07-17 |
Family
ID=48770949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220719979 Expired - Lifetime CN203072209U (en) | 2012-12-24 | 2012-12-24 | LED light flux automatic adjusting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203072209U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114271029A (en) * | 2019-06-28 | 2022-04-01 | 法雷奥照明公司 | Device and method for controlling a set of light sources of a lighting assembly of a motor vehicle |
-
2012
- 2012-12-24 CN CN 201220719979 patent/CN203072209U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114271029A (en) * | 2019-06-28 | 2022-04-01 | 法雷奥照明公司 | Device and method for controlling a set of light sources of a lighting assembly of a motor vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130717 |
|
| CX01 | Expiry of patent term |