Dimmable driver for light-emitting diode with total harmonic distortion improved

A novel dimmable light-emitting diode (LED) driver is presented. Via a simple concept, the total harmonic distortion and the power factor of the proposed LED driver are significantly improved as compared to the traditional LED drivers. Above all, there are no capacitor and no inductor in the main power stage of the proposed LED driver, thereby causing the life of the LED driver to be enhanced and the integral circuit design to be easy to achieve. Moreover, a new LED dimming strategy is presented. The basic operating principles of the LED driver are described in detail, along with some simulated and experimental results to demonstrate the effectiveness and feasibility of the proposed LED driver.