The working principle of the lamp post

The LED lamp post uses three blue LEDs of red, green and blue as the light source. The four rows of LED light are projected to the inner surface of the digital lamp post through the milky white transparent tube. Decorative lighting effect.

The lamp post is connected with a digital circuit, and the controller performs corresponding control on the outside. By modulating the working mode of the controller, a variety of colors and states can be changed according to a certain rule. [2]

The heart of the LED is a semiconductor chip, one end of the chip is attached to a bracket, one end is the negative pole, and the other end is connected to the positive pole of the power supply, so that the entire chip is encapsulated by epoxy resin. The semiconductor wafer is composed of two parts, one part is a P-type semiconductor, in which holes dominate, and the other end is an N-type semiconductor, which is mainly electrons. When these two semiconductors are connected, a P-N junction is formed between them. When the current acts on the chip through the wire, the electrons will be pushed to the P area, where the electrons and holes recombine, and then emit energy in the form of photons, which is the principle of LED light emission. The wavelength of light is also the color of light, which is determined by the material forming the P-N junction.

A single LED lamp bead can only work under low voltage (about 3V) and low current (about a few milliamperes), and the light emitted is very weak. Many LED lamp beads need to be connected in series or in parallel; at the same time, a single LED lamp bead is unidirectional. In order to make full use of the positive and negative half-cycle current of alternating current, an integrated circuit chip is required to convert the AC 220V power supply into voltage and current energy. Direct current matched with the LED assembly to meet the requirements of the LED lamp bead assembly, so that it can emit light normally