Common types and application fields of LED lamp beads
There are many types of LED light sources, and the lamp beads used in the internal structure of different LED lights will also have subtle differences. Today, the editor will comprehensively and systematically popularize the common types of LED lamp beads for your reference.
LED lamp bead product summary
1-pin plug-in type (DIP)
This kind of LED lamp bead is the light-emitting diode with the simplest structure, because there are two filaments shaped like "feet" under the lamp bead, which can be directly connected to the circuit board, so it is called a pin-inserted lamp bead.
Direct plug-in LED lamp bead diagram
It has good safety, stable performance, can emit light under low voltage conditions, and has low loss, high efficiency, long life, and can also perform multi-color dimming.
This kind of lamp beads can have various shapes, such as round, oval, square, and even shaped. Although roughly speaking, there is not much difference in shape and size, but the cross-sections of different shapes of lamp beads are different.
Types of direct plug-in LED lamp beads
If you look carefully at different lamp beads, you will find that some lamp beads have different numbers of "pins", which can make the light-emitting diodes produce different colors of light.
Types of led lamp beads
In the field of lighting, pin plug-in lamp beads are hardly used; generally they are mostly used as car lights, indicator lights, display screens, etc.
In-line LED lamp bead application field
2 low power surface mount type (SMD)
This kind of lamp bead light source is to solder the light-emitting diodes on the surface of the circuit board instead of passing through the circuit board. It is small in size, and some are even smaller than pin-inserted lamp beads.
There are many models of this type of lamp beads, the most commonly used ones are 2835 (PCT), 4014, 3528, 3014, etc. The first two digits of each model number represent the width "x.x mm", and the last two digits represent the length "x.x mm". . For example, 2835 represents a width of 2.8 mm and a length of 3.5 mm.
SMD led lamp beads
The surface of the lamp bead coated with yellow phosphor emits white light
This kind of low-power surface-mounted lamp beads has a wide range of applications. Because of its small size, it can be used anywhere, so it can be pasted on various LED lights, and the quantity can be adjusted and changed according to needs.
SMD lamp bead application field
3 high power surface mount type
The third type of lamp bead is also a surface-mounted type, which is similar in essence to the low-power surface-mounted type, except that the high-power and volume are larger; in terms of fine structure, there is an extra lens to better focus the light on the surface. Together.
High power led lamp beads
There are also many types of high-power surface-mount lamp beads:
Types of high power LED lamp beads
Here is a little trick for everyone: if the surface color of the lamp bead is yellowish, it is generally low color temperature; if the surface color is greenish, it is generally high color temperature; if there is no phosphor, the lamp bead is colorless and transparent, generally it is colored light.
This kind of lamp bead is generally used after being put on a lens (to facilitate the convergence or dispersion of light), and is often made into spotlights and spotlights.
Application fields of high-power LED lamp beads
4 integrated package type (COB)
The last type is the integrated package type lamp bead, which is to package many lamp bead chips on the same board, and the size is the same as the diameter of a 50 cent coin.
Integrated COB lamp beads
Generally, there are round, strip and square, and strip-shaped integrated boards are often used as desk lamps.
Integrated and packaged LED lamps are gradually being used more and more, and are used in both indoor lighting and outdoor lighting.
COB application field
LED lamp bead,LED lights
There are many welding methods for LED lamp beads on the chip, and the following is one of the commonly used methods for reference. First, use an electric soldering iron to heat some soldering tin on the positive and negative electrode pads of the lamp bead (the soldering tin must not be too much, otherwise, the positive and negative electrode pads will be connected once heated with a hot-air gun), then use a hot-air gun to heat the positive and negative electrode pads at the same time, after the tin melts, use tweezers to place the positive and negative electrodes of the lamp bead on the corresponding pad.
LED is the light emitting diode, which is a semiconductor solid light emitting device that converts electric energy into light energy. Its core is the PN junction. In addition to the forward conduction, reverse cut-off and breakdown characteristics of the general PN junction, it also has the light emitting characteristics under certain conditions. Its structure mainly includes the following parts: lead, bracket, encapsulation glue, bonding wire, LED chip, solid crystal glue and phosphor. The discoloration failure of LED lamp bead is closely related to its material, structure, packaging process and service conditions. The following will analyze the causes of its discoloration through specific cases.
LED lamp beads are also called light emitting diodes. It has a wide range of applications. Its luminous colors include red light, emerald green light, yellow green light, yellow light, purple light, blue light, white light and orange light. The above is monochromatic light. It can also be made into two or three colors.
The gold wire used to package LED lamp beads contains more than 99.99% gold. It is produced by drawing gold from this material. In addition to 99.99% gold, this gold also contains less than 1% other trace elements. One of the core components of LED lamp bead packaging is gold wire, which is the bridge connecting the luminous chip and the welding point, and plays a decisive role in the service life of LED lamp bead. So how to identify the purity of gold thread?