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What is LED related knowledge?

Update:08 Mar 2021
Summary:Classification of LED lights:Fluorescent lamps, panel lights...

Classification of LED lights:
Fluorescent lamps, panel lights, downlights, ceiling lights, spotlights, track lights, etc.
Classification of common lamp beads:
1. In-line low power specifications include: straw hat/steel helmet, round head, concave, oval, tombstone type (2*3*4) bullet head, flat head, (3/5/flat head/bread type) piranha, etc.
2. SMD patches are generally divided into (3020/3528/5050 these are front-emitting)/1016/1024, etc. These are side-emitting light sources, where the name is named according to the specifications of the patch, such as 3020 is 30mm*20mm Specifications.
3. High-power LEDs cannot be classified into the patch series, their power and current usage are different, and the photoelectric parameters are very different. If a single high-power LED light source is not equipped with a heat dissipation base (usually a hexagonal aluminum base), its appearance is not much different from ordinary patches. The high-power LED light source is circular, and the packaging method is basically the same as that of SMD patches. However, it is essentially different from SMD patches in terms of use conditions/environment/effects.
Single lamp bead voltage: the voltage of the general lamp bead is 2.8-3.6vf, and the middle value is 3.3vf when calculating series and parallel
Power category:
According to the different output characteristics, it is divided into: constant voltage series (CV), constant current series (CC) (constant voltage refers to constant voltage output, constant current output, and one of them is a constant voltage + constant current complementary power supply)
According to the different input characteristics, it can be divided into: ordinary series, high power factor series
According to different purposes: waterproof series, non-waterproof series
According to the different circuit structure, it is divided into: isolated series and non-isolated series (the difference between isolated and non-isolated here is mainly whether there is a transformer, because we know that the household voltage is 220v sinusoidal alternating current, and the design idea of ​​isolated power supply is to step down the voltage through the transformer first. After rectification, this design can distinguish high voltage from low voltage, which has advantages over power supplies without transformers. For example, the output of our LED power supply is a safe DC voltage, which people can directly touch (except for high-power power supplies), even if the low-voltage part is broken, There will be no leakage of electricity, but the use of non-isolated ones is likely to cause electric shock
According to different control methods, it is divided into: dimmable series and non-dimmable series

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