A novel single-switch single-stage high power factor LED driver is proposed by integrating a flyback converter, buck–boost converter and current balance circuit. Only an active switch corresponding control circuit are used. The can be adjusted the scheme of pulse–width modulation (PWM). performs function correction (PFC), which operated at discontinuous-current mode (DCM) to achieve unity low t...

— In order to have drinking water, some countries have to use chlorine. It is use cause is effective and it's cheap. An alternative to this process is the UV disinfection of drinking water. Most of the devices in the market use UV bulbs or mercury lamps. The UV LED, which is cheaper and smaller, allows creating new smaller devices. The main contribution of this paper is the use of Genetic Algor...

A single-stage LED driver based on interleaved buck-boost circuit and LLC resonant converter is proposed. The buck-boost circuit and LLC resonant converter are integrated by sharing switches, which can decrease the system cost and improve system efficiency. The input voltage of the buck-boost circuit is half of the rectified voltage, and two buckboost circuits are formed with the two half-bridg...