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

A technology of LED tunnel light and control method, applied in lighting device, electrical program control, energy-saving control technology and other directions, can solve the problems of shortened life, inconvenient replacement and maintenance, waste of energy, etc., so as to prolong the service life and compensate for light decay. Effect

Inactive Publication Date: 2009-07-08
FUDAN UNIV
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Problems solved by technology

But on the one hand, the large current in the early stage causes redundant luminous flux output and wastes energy; on the other hand, the large current in the early stage will further increase the light decay of high-power LEDs and shorten the lifespan.
[0004] For tunnel lights, because they are installed in the tunnel, it is quite inconvenient to replace and maintain, and they need to be ignited for 24 hours, so the lamp itself needs to have as long as possible life and light output stability.
The light decay problem of the above-mentioned LED will greatly limit the life and light stability of the tunnel lamp, which must be solved

Method used

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  • Control method and apparatus for implementing long-term maintained light strength by high power LED tunnel lamp
  • Control method and apparatus for implementing long-term maintained light strength by high power LED tunnel lamp
  • Control method and apparatus for implementing long-term maintained light strength by high power LED tunnel 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 tunnel light, and a horn-shaped shutter is installed on the probes, on the one hand, to shield the ambient light from the outside world, and on the other hand, to 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 incident o...

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Abstract

The invention belongs to the field of high-power LED tunnel 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 tunnel 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 tunnel lamp; meanwhile, the service life of the LED tunnel 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 tunnel 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 tunnel lights, and in particular relates to a control method and device for realizing long life and maintaining light intensity of high-power LED tunnel lights. Background technique [0002] At present, high-power light-emitting diodes (LEDs) are gradually being used in tunnel 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 tunnel lights, 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 tunnel lamp is used for a period of time, the road illuminance decreases, which may not meet the lighting requirements. Therefore, for outdoor lighting fixtures, when the light decay reaches 30%...

Claims

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Application Information

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