A Design of Ring-Shaped LED Driving Circuit Used in Optical Instruments Illuminating System

摘要

According to the requirement of optical instrument illuminating system and performance characteristic of Ring-Shaped LED, a constant current circuit based on PT4115 chip is designed to drive Ring-Shaped LED. It is proved that not only the LED's light intensity can be conditioned by PWM, but also its heat dissipation can be solved effectively. Moreover, compared with traditional halogen lamps, it has the advantage of the small volume and low-cost. Therefore, it can be widely applied to optical instrument illuminating system. This paper is applies innovative. Ring-Shaped LED of base on Amega 16 and PT4115 is applied for optical instrument illuminating system.