A single-switch LED driver based on Class-E converter with digital control

This paper presents a single-switch LED driver based on Class-E converter with digital control. The working frequency of switch can reach the 500kHz, which can decrease the volume of system and improve the difficulty of design of LED driver system. Based on Extended Describing Functions (EDF) model analysis method, utilizing the soft switching character of Class-E, a digital control method is applied to improve the efficiency and decrease the volume of system in high frequency working state. Buck-Boost circuit is selected as the power factor correction (PFC) cell, Class-E is used as the DC-DC converter to realize the energy transmit. By applying the digital control, a 100W prototype of LED driver is presented. The experimental results certify the validity of proposed LED driver with digital control. The power factor (PF) can reach the 0.99 and efficiency of system can reach 92% at the rated state.