Millet with LED lights violent dismantling, rich is so capricious!

Today, Xiaobian has more pieces of Xiaomi portable LED lights. When it comes to LEDs, everyone thinks that the brightness is high, the heat is low, and the power is saved. A few decades ago, my grandmother was under the kerosene lamp, and she often had a power outage 20 years ago. Her mother sometimes supplemented the sewing under the candle. The common point of kerosene lamps and candles is that they have low brightness and are prone to burns, and serious fires may occur. Do you still remember the pain of reading a book in the bed after going to school in the dormitory? Holding your hands for a long time will make your arms sour, and it’s hard to put on the books. Now the problem with the LED light on the millet is also solved.
In the early days of liberation and in the rural areas where there was no electricity in the 1960s and 1970s, kerosene lamps were commonly used. During the planned economy period, kerosene should be purchased at the supply and marketing cooperatives, so the careful hostess would adjust the brightness of the lamps in a timely manner. Only when the child writes his homework will the light be brightened. Even so, in the breeze, the lights that flickered up and down still couldn’t be how far away, and several children could only sit around the lights. A little longer, the eyes will be dark. The diligent hostess will not let the lights be wasted, and timely support the splint soles or sewing clothes.
A lit incandescent lamp has a filament temperature of up to 3000 °C. It is because of the radiant filament that produces light radiation that makes the electric light shine brightly.
Due to the large power consumption, short life and low performance of incandescent lamps, the performance is far lower than the new generation of new light sources. In order to save energy and protect the environment, incandescent lamps have been replaced by some green light sources, and they are required to gradually withdraw from the market. Some countries have banned production. And selling incandescent lamps.
The energy-saving lamp is actually a compact fluorescent lamp with a ballast. When the energy-saving lamp is ignited, it is first heated by the electronic ballast to the filament of the lamp, and the filament is emitted at the beginning (because some electronic powder is coated on the filament). The electron collides with the argon atoms in the lamp tube. After the collision of the argon atoms, energy is generated and the internal mercury atoms are struck. After the energy is absorbed by the mercury atoms, the ions are ionized and the plasma forms a plasma state. The voltage across the lamp is directly passed through the plasma and emits 253.7nm of ultraviolet light. The ultraviolet light illuminates the phosphor. Since the temperature of the filament is about 1160K when the fluorescent lamp is working, it is much lower than the temperature of the incandescent lamp operating at 2200K-2700K. Its life is also greatly improved, reaching more than 5,000 hours, because it uses high efficiency electronic ballast, and there is no current thermal effect like incandescent lamp, the energy conversion efficiency of the phosphor is high, reaching more than 50 lumens per watt, so Save energy.
LED lights are also a type of diode. It is a special type of diode that emits light that can be seen by the naked eye when properly energized. It also has the same single-pass characteristics as a normal diode. It also inherits the shortcomings of the reverse phase breakdown of the diode, so the LED light should not reverse the positive and negative poles.
LED lamps have the advantages of small size, low voltage, long life, low heat generation and high brightness.
Electro-optic conversion rate
Service life
Operating Voltage
Harmful Substance
Incandescent lamp
About 10%
About 1000 hours
12V-220V
no
Energy saving lamp
About 30%
8000 hours
170V-250V
Have
Led light
Nearly 60%
Up to 100,000 hours
Around 3V
no
The power of the millet portable LED lamp is 1.2W, and the power supply voltage is 5V. The continuous use time of each mobile power source is calculated by these two known conditions.
1.2w/5v=0.24a. 0.24a=240ma
In order to better prove the actual working current of the LED lamp, Xiaobian deliberately purchased a small USB power meter.
The working current calculated by Xiaobian is 0.24A. This is only the theoretical value. In practice, there are other electronic components and wires that are resistant to the current, so the actual current has a certain error with the theoretical value.
Millet portable LED lights on all capacity millet mobile power supply time
Millet mobile power
4500ma
5000ma
10400ma
16000ma
Continuous use time (h)
18.75
20.83
43.33
66.66
Today, Xiaobian will give you the opportunity to open the LED light of the millet and walk into the LED light to see the structure and workmanship. Viewing the structure of the LED light from the outside is not complicated, so the tool is relatively simple. The LED lamp is unrecoverable after being removed from the overall design, so it is not recommended to disassemble it. Xiaobian is also purely handcuffs. After reading this post, you saved 19.9 yuan. Is it very cost-effective? Disassemble is risky and should not be easily imitated.
The portable LED lamp is a cast-integrated product that cannot be recovered after being disassembled. This is also proved from the above figure. Such a unitary structure is advantageous for aesthetics, but is not conducive to maintenance. It also has good water resistance, but it is difficult to flow out when the water actually enters the inside of the lamp body, which has a great influence on the service life of the internal electronic components. So don't let the water vapor in the lamp. If you accidentally sprinkle the water during use, remove it in time and wipe it with a paper towel to avoid liquid immersion.
Remove the front frosted mask to see the internal LED lights and some electronic components. The advantage of using a frosted mask is to avoid direct light. The light from the adjacent two lamps will refract the light of the entire LED body. Integration, there will be no black shadow between each lamp. After refracting, the light that enters the eye will be softer and less dazzling.
At first, I thought that the millet LED lamp adopts the design of universal bending. Now, solve the mystery that can't be bent universally. Be careful not to draw it here. This knife will mean that it will never be restored. So curiosity is a price to pay.
After the LED lamp's clothes are smashed, the bent part is a 14# high-toughness wire. This wire is very soft and easy to shape and does not rebound. Two good quality 0.5 square millimeter tinned copper wires. Such a wire can withstand a current of 3 A, so it is completely sufficient to make a 1.2 W LED lamp power cord. Everyone can use it with confidence. After opening, it is found that the millet LED lamp is not a universal bending because it takes into consideration the mechanical structure and mechanical strength.
The design of the circuit board is very simple, the wiring is orderly and the workmanship is exquisite. Each LED lamp bead is very large, so that it has a higher lumen.
I saw the Xiaobian stunned here. The circuit board and the heat conducting board are not conducted by using thermal grease , but are printed directly after the metal board is coated with an insulating layer. This heat transfer efficiency is greatly improved.
In order to consider the lower thermal conductivity of the plastic, a metal middle frame is added before the plastic casting to allow the heat to be led to the rear heat sink faster. Accelerate the internal and external heat exchange, extending the service life of LED lights and other electronic components.
The material of the LED light supply wire is also very particular. Although the color of the wire seen is white, the white wire will first think of aluminum wire and wire. Such a white wire is tin-plated with copper to protect the copper wire from oxidation. Such thick and high-quality copper wire is to reduce the resistance and reduce the electrical loss, so that more electricity becomes light instead of turning it into heat.
After measurement, the six LED beads are linked in series. The voltage also rose from 5V to 18V. The careful friend found that the placement of the small-coded test pen was not a normal tandem position, but it was true that Xiao Bian began to wonder. After the actual measurement, the light at the bottom and the other five light beads were placed in reverse. I did not understand it.


In short: technology is improving, and Xiaomi is making progress. Technology has brought a variety of new products to replace the old ideas, and Xiaomi has let technology enter our lives faster and more harmoniously. I hope this is just the beginning. I hope that more and better technology products will enter our lives faster and better. For the disassemble Xiaobian is just the beginning, after the small series will bring you more disassemble and DIY posts, let everyone know more about the internal structure of Xiaomi products, let us feel more at ease in the convenient life.

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