LED (Light Emitting Diode), light-emitting diode, is a solid-state semiconductor device that can convert electrical energy into visible light, that is, light-emitting diode, which can directly convert electricity into light. The heart of LED is the wafer of a semiconductor, and one end of the wafer is attached to a bracket, one end is a negative pole, and the other end connects the positive pole of the power supply, and the whole wafer is encapsulated by epoxy resin. The semiconductor wafer is made up of two parts, and a part is a P-type semiconductor, and the hole occupies a leading position in it, and the other end is an N-type semiconductor, and here mainly is the 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, the electron will be pushed to the P district, and in the P district, the electron is recombined with the hole, then will send energy in the form of a photon, the principle of LED light that Here it is. And the wavelength of light i.e. the color of light is determined by the material forming the 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, 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.
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