lamp is the abbreviation of LIGHTEMITTINGDIODE “English”, Chinese
abbreviation light-emitting diodes, because it has the environmental protection,
long service life, high efficiency (currently photoelectric efficiency 100LM/W)
has reached and the aseismatic etc in recent years, numerous advantages of rapid
development in all applications, theoretically, LED the service life of 10
million hours in, but in actual application process, some LED lamps and lanterns
to LED drive power design staff, inadequate understanding or improper selection
or blindly seek low cost and the result of LED lighting products life shortens
greatly, poor LED lamps and lanterns life less than 2,000 hours, some even more
low, the results make the advantage of LED lamp and
lanterns is not very good play.
Due to the particularity of LED manufacturing
lead to different manufacturers even the same manufacturers in the same product
production LED the current, voltage characteristics were all have large
individual differences. Now white LED with high-power 1W leds typical spec for
example, according to the current, voltage LED to do change rules briefly,
generally white application forward voltage 1W leds for 3.0-3.6 V or so, that is
to say, when nominal for 1W leds in LED through 350 ma, it ends when the voltage
may be in 3.1 V, may also be at 3.2 V or 3.5 V may also be other values, to
ensure that 1WLED life, general LED manufacturers suggested 350mA current with
lamps factory to drive, when the positive current ends by LED to 350 ma, LED the
positive voltage ends small increases, can make positive current substantial LED
LED temperature rising, making up into a straight line, and thereby accelerated
light failure, that LED life shorten, serious when even burned LED. Because
the LED the particularity of voltage, current, change, so the power to drive LED
forward strict requirements.
Constant-current source drive is the best LED
drive way, USES the constant-current source drive, not in the output circuit
current limiting resistor in series on the current flows, LED by external power
supply voltage nor changes, environmental temperature changes, and the influence
of LED parameters, thus discreteness can keep a current constant, give full play
to all kinds of excellent features. LED
Using LED
tube constant-current power to give LED lamps and lanterns in power supply,
because during the work will automatically detect and control the current flows
through the LED, therefore, need not worry too much in the electric current
through the moment of LED, also need not worry load short-circuit burnt out
power supply.
Some manufacturers worry power driven plate choose electrolytic
capacitors will affect the power of life, it is actually a misunderstanding, for
instance: if choose 105 degrees, life is 8000 hours of high temperature
capacitors, according to popular electrolytic capacitors life estimation way
“every reduce 10 degrees, life doubled,”steel door then it in 95
degrees environment for 16,000 hours, the working life in the working life under
the environment of 85 degrees for 32,000 hours, 75 degrees environment for
64,000 hours working life, if the actual working temperature lower, so they will
live longer! Thus selects high quality view, as long as the electrolytic
capacitors to drive power lifespan is no influence!
It is also worth LED lighting and
lanterns enterprise note: because in work process will LED give off a lot of
heat, make the tube core junction temperature rise rapidly, LED the higher
power, heating effect is bigger. LED chips temperature increases will lead to
the change of the performance of the light-emitting device with lightning
conversion efficiency attenuation, serious when even failure, according to test
show that: LED its temperature 5 degrees Celsius, flux per rise by 3%, so will
decline LED lamps and lanterns must note LED strips source itself in the
heat work, possibly try to increase the cooling area LED light itself, minimize
its working temperature LED, if conditions allow, best can will power part and
light separated pursuit blindly part, small volume and ignore lamps and lanterns
and power supply temperature is not advisable.

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