A high brightness light-emitting diode driver with power factor and total harmonic distortion improved

In this paper, a novel bridgeless light-emitting diode (LED) driver is presented. Via a simple control circuit, the power factor (PF) and total harmonic distortion (THD) of the proposed bridgeless LED driver are significantly improved as compared with the traditional one. The proposed AC LED driver is capacitorless and inductorless, thereby causing the integral circuit design to be easy to achieve. Besides, by doing so, there are other advantages, such as reduction of LED heat dissipation, enhancement of life of the LED driver, reduction of size and weight of light equipment. In this paper, the basic operating principles of the LED driver is described in detail, along with some simulated and experimental results to demonstrate the effectiveness and feasibility of the proposed LED driver.