In fact, as long as it is an electrical
appliance-related product, occasional news will be heard about electrical fire,
product burning, and even explosions. And the LED light explosion event is even
more inevitable. Let's take a look at a few related news first:
First: When a worker was welding, the LED
light next to it suddenly exploded, and the coworker was bombarded with blood.
Second: A netizen bought an LED light and
exploded suddenly after using it for three months.
Third: A gentleman removed the LED light
from the car and installed it on the shop's door. At over 11 in the evening, he
heard the sound of an explosion. Only ten minutes later, the entire shop was
completely swallowed up by the fire.
After the 湖南台的新聞大求真實驗, we
can see that when the ordinary light bulb is on, it will be hot, and the
temperature of the tested ordinary light bulb has reached 271 degrees. If at
this time, let it suddenly drop in temperature, such as sprinkle water, the
light bulb breaks instantly.
But will the LED lamp explode due to a
sudden temperature drop? An LED spotlight was used in the experiment. When the
spotlight was glowing, the temperature was only 28.4 degrees. Spraying water
for a long time did not cause any explosion. At this time, the question has
increased. LED lights don't explode like ordinary incandescent bulbs because of
a sudden temperature drop. Then, what is the explosion of LED lights?
Below, through experiments, we come to
reveal:
After the Quality inspectors explained, we
know that the LED lamp has two parts: One is the LED lamp beads and the other
is the driver. We use 220V AC every day. After the drive, we convert 220V AC to
12V DC. Then LED lights are not dangerous under normal circumstances. Of
course, if you use the process is directly to the 220V AC power delivered to
the LED lights, it must be the LED lamp beads explosion. Quality inspectors
told us that there were two types of fires in LED lights: one was that the lamp
beads caught fire, and the other was that the driving power source exploded and
caught fire.
Experiment: Without Drive Power
Experts did experiments on dismantling the
LED lamp driving power. We found that the LED lamp was broken down
instantaneously.
Question: Is the fire in the news just like
this happening?
Dr. Wang said that in fact, no fire will
occur in this situation. If the LED lamp is exploded and causes a fire, it is
generally due to the driving power source. For example, in the bath, because of
the wet, causing the driver power supply to short circuit, it is also easy to
cause an explosion; The other case is that the components inside the drive have
small values and the quality does not meet the requirements. It may also cause
explosions and fires.
After the experiment: No. 1 and No. 2 LED
lamps were artificially rebuilt by the circuit, causing a short circuit, and
No. 3 and No. 4 LED lamps were used to reduce the driving power. We found that
all four LED bulbs exploded.
The truth emerges:
Like the third news above, the LED
headlights were placed on the door of the shop, causing explosions and fires
because the power supply was not matched.
So quality is critical, do not choose
products from unknown small workshops and choose products produced by regular
manufacturers. Relatively speaking, they have high safety. Of course, you can’t
easily modify the LED lights to avoid the explosion of LED lights.
Reference: https://zhuanlan.zhihu.com/p/28119538
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