People like to be warm and comfortable and don't like ignorance of the future. Tungsten halogen lamps and incandescent lamps are currents that illuminate through the filaments. When the current is reduced, the temperature drops, but produces light that is not cooler but warmer to make the environment more elegant and more relaxing.
The dimming of LEDs is completely different. In order to reduce the emitted light, the current is reduced but the color temperature is not shifted much, moving in a colder direction, although the light effect is improved, it causes a feeling of discomfort and the same or similar effect. The dimming of the LED is not like the flesh-tungsten lamp, so that the emitted light moves on the black body curve. This requires the method of storing the film to produce a luminous effect similar to that of the tungsten halogen lamp through the LED chip , the substrate, the optical, and the controlled electronic system. . Figure 1 is a chip structure that can replicate the dimming effect of a high-quality tungsten halogen lamp. By combining various chips, a constant high-quality dimmable light is obtained.
Figure 1 shows the structure of the LED chip for dimming
If you try to dim the LED along the black body ff1 line, we must use light mixing from at least three types of chips to create a dimming effect similar to a tungsten lamp. In order to obtain the effect of white light, the blue LED is coated with red and yellow phosphors to obtain color coordinates requiring white light. Other phosphors are used to obtain light of other colors, and then mixed to obtain a light mixing effect of three MacAdam ellipse.
In order to produce an effective light mixing effect, the chips must be placed close together on the substrate. The heat generated by the LED current is dissipated, and the method of bonding through the thermal paste is used, but the heat dissipation effect of the gold low temperature bonding technology is good.
The combination of multiple pieces of emitted light is a design of Total Internal Reflection (TIR), which makes the concentration and utilization of the emitted light better than that of the reflection method, as shown in Figure 2.
Fig. 2 The light distribution curve of the device obtained by TIR light mixing is better than that of the reflector. The dimming device obtained by dividing the dimming module with three groups of chips is added with different diffusion covers. The result of multiple beam angles is 24. 36. And 45. A variety. The light color range is continuously changed from 3000 to 1800K (maximum light transmission; 2%), and the light color quality is 3000K when it is in the third-order MacAdam ellipse, CRI=90, R. The level of =80, the total luminous flux of the output is 1100lm, the system power is 17.3w, and the calculation efficiency is 63lm/W. The average CRI85, R during the dimming process. The average value of 70.
The phone cable is the cable that connects the phone to the computer.USB Cable general data line rarely dedicated, the general phenomenon is that a data line can be used for a variety of mobile phone models,some models of data line is exaggerated,a line can use 30-40 different types of mobile phones.General data lines are rarely dedicated, the general phenomenon is that a data line can be used for a variety of mobile phone models, some models of data lines are exaggerated, a cable can use 30-40 different types of mobile phones.
Mobile phone data cable and charging speed has a relationship.The cable connects the phone to the charging head and is mainly responsible for current transmission,so inevitably,it will also affect the charging speed.In addition, the length of the data line also has a certain impact on the charging speed.The shorter Usb Cable Type C is,the faster the charging speed will be. Generally, the standard data line of mobile phones is 1 meter, but in the selection of different use scenarios can also match different lengths of data lines.The charging speed and charging head are also affected by the charging head of the mobile phone.When charging a phone, the charging head determines the amount of voltage and current. Regular charging heads are marked with voltage and current output.
Different quality data line thickness, length are different, generally should try to choose the wire diameter thick, wire surface is not reflective and the wire is long enough data line, the thicker the wire.It is proved that its tensile strength is high and it has a good protective effect on copper core.The more the wire surface is not reflective, the more the composition of the rubber in the wire, the better elasticity of this data line, anti-aging, not easy to break, the wire is long enough, it will be quite free in use.
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