AC direct drive LED light source technology - Power Circuit - Circuit Diagram

MOS power IC full range

5050 Orange Light Orange Light Orange LED Bead 5050 Light Source Amber Amber Light Orange

KKST patch plug-in active passive crystal oscillator hot sale 24.576000MHZ

LED light source has emerged as a fourth-generation lighting fixture with green, energy-saving, energy-saving and long-life. The current LED light source is a semiconductor device that operates at a low voltage (VF=2~3.6V) and a large current (IF=200~1500mA), and must provide a suitable direct current to emit light normally. The technology of direct current (DC) driving LED light source has become more and more mature. Since the power supply used in our daily lighting is high voltage AC (AC 100 ~ 220V), it is necessary to use the buck technology to obtain a lower voltage. The transformer or switching power supply is stepped down, and then the alternating current (AC) is converted into direct current (DC) and then converted into a direct current constant current source to cause the LED light source to emit light. Therefore, the system application scheme of DC-driven LED light source must be: transformer + rectification (or switching power supply) + constant current source (Figure 1). LED lamps must have a certain amount of space to house this module, but for E27 standard screw luminaires, the space is very limited and difficult to place. Whether it is via transformer + rectification or switching power supply step-down, the system will have a certain amount of loss. When the DC LED is switched between AC and DC, about 15% to 30% of the power is lost, and the system efficiency is difficult to achieve more than 90%. . If the LED light source can be directly driven by AC (AC), the system application scheme will be greatly simplified, and the system efficiency will easily reach 90% or more.