Control method and apparatus for implementing long-term maintained light strength by high power LED road lamp

A technology of light-emitting diodes and control methods, applied in the field of high-power LED street lamps to achieve long life and maintain light intensity control, to achieve the effects of prolonging service life and compensating for light decay

Inactive Publication Date: 2009-07-08
FUDAN UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The present invention aims at many problems caused by the static control strategy adopted in the service life of the existing LED street lamps, and designs and provides a control method and device for realizing the long life of the high-power LED street lamps and maintaining the light intensity, which can make timely adjustments to the light decay. dynamic compensation

Method used

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  • Control method and apparatus for implementing long-term maintained light strength by high power LED road lamp
  • Control method and apparatus for implementing long-term maintained light strength by high power LED road lamp
  • Control method and apparatus for implementing long-term maintained light strength by high power LED road lamp

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Embodiment

[0069] In this example Figure 4 Among them, four photoelectric probes are installed at the light outlet of the street lamp, and a horn-shaped shutter is installed on the probes, on the one hand, it can shield the ambient light from the outside world, and on the other hand, it can collect as much LED light as possible. The probe regularly samples at twelve o'clock in the middle of the night, and generally collects multiple sets of signals at a time. The subsequent circuit converts the optical signal into an electrical signal, and the electrical signal is amplified by the operational amplifier and converted by the subsequent A / D conversion device to become a digital signal and input to the control unit. The control unit here is an MCU, which compares the obtained signal with the average of the previously measured signal, and if it finds a signal with a sudden change, it will automatically discard this signal. This digital filtering method can remove the signal accidentally inc...

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Abstract

The invention belongs to the field of high-power LED street lamp technology, concretely relating to a control method and a device for realizing long service life light intensity of a high-power light emitting diode street lamp. The invention has an adoption of closed-loop digital control; output light of LED is maintained to be strong in the whole service life span; and light decay thereof is compensated, thus guaranteeing a satisfactory luminous intensity in the service period of the street lamp; meanwhile, the service life of the LED street lamp can be prolonged. Concretely, optical signal output by the LED is detected, amplified, and converted by the device; the signal is filtered and judged and false signals are removed. In turn, light output of the lamp is regulated according to the light decay size obtained by calculation. The control method and a device for realizing long service life light intensity of a high-power light emitting diode street lamp also comprises a method for judging expiration of the service life of the lamp and sending out warning signal to an upper system at the expiration of the service life.

Description

technical field [0001] The invention belongs to the technical field of high-power LED street lamps, and in particular relates to a control method and device for realizing long service life and maintaining light intensity of high-power LED street lamps. Background technique [0002] At present, high-power light-emitting diodes (LEDs) are gradually being used in road lighting and other fields due to their long life, low power consumption, high luminous efficiency, easy control and environmental protection, and have won a wide market. However, in the actual high-power street lamps, it is found that with the increase of LED ignition time and the existence of factors such as poor heat dissipation design, its light output will gradually decrease, which is the so-called light decay. After the street lamp has been used for a period of time, the road illuminance will decrease, which may not meet the lighting requirements. Therefore, for outdoor lighting fixtures, when the light deca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02G05B19/02
CPCY02B20/42Y02B20/46Y02B20/72Y02B20/40
Inventor 刘木清蒋晓波江磊岑忞韩凯
Owner FUDAN UNIV
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