LED 大功率灯精准控制驱动电路设计

This paper designs a precise control drive circuit for LED high power lamp. It takes the STC89C52 single chip microcom-puter chip as the control core, selects the PT4115 as the LED power supply chip, uses the PWM to adjust the brightness mode, and re-alizes the adjustment of brightness. The LED has good characteristic of constant current, little change of light color. The circuit can becontrolled by key or infrared light, and provides over-voltage and over-current protection. Through experiments, the circuit has goodstability and can be adjusted by software program, which can realize multi-stage and even stepless dimming and achieve accurate dim-ming.