Working principle of LED lamp post

The LED lamp post uses red, green and blue LEDs as the light source. Four rows of LEDs project light through the milky white transparent tube to the inner surface of the digital lamp post. Decorative lighting effects.
There is a digital circuit inside the lamp post, and the controller controls the outside accordingly. By modulating the working mode of the controller, various colors and states can be changed according to certain rules.
The heart of LED is the chip of a semiconductor, and one end of chip is attached on a support, and one end is negative pole, and the other end connects the positive pole of power supply, and whole chip is encapsulated by epoxy resin. Semiconductor wafer is made up of two parts, and a part is P-type semiconductor, and hole occupies an leading position in it, and the other end is N-type semiconductor, and here mainly is electron. Time these two kinds of semiconductors couple together, between them, just form a P-N junction. When electric current acts on this chip by wire time, electron will be pushed to P district, and in P district, electron is recombined with hole, then will send energy with the form of photon, the principle of LED light that Here it is. And the wavelength of light i.e. the color of light, be determined by the material forming P-N junction.
A single LED lamp bead can only work at 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 unidirectionally conductive. In order to make full use of the positive and negative half-cycle currents of AC, this requires an integrated circuit chip to convert AC 220V power into voltage and current energy. The direct current that matches the LED assembly meets the requirements of the LED lamp bead assembly so that it can emit light normally.