Abstract: Quasi-resonant flyback (QRF) converters have been widely applied as the main circuit topology in power converters because of their low cost and high efficiency. Conventional QRF converters tend to generate higher average conducted electromagnetic interference (EMI) in the low-frequency domain due to the switching noise generated by power switches, resulting in the fact they can exceed...

In this paper a new LED driver and its controller are conceived realized and experimentally validated. It presents several advantages compared with existing counterparts: First it uses a single converter while most of the existing drivers are based on a two-converter architecture. In the proposed approach the average current through the LED is directly regulated. The proposed driver is built ar...

This paper presents the design and modeling of a square micro-transformer for its integration in a flyback converter. From the specifications of the switching power supply, we determined the geometric parameters of this micro-transformer. The π-electrical model of this micro-transformer highlights all parasitic effects generated by stacking of different material layers and permits to calculate ...

This paper presents the design criteria, procedure and implementation of an AC-DC Flyback Switch Mode Power Supply (SMPS) which provides 250W rated average power to a big size Colour Television (CTV) Set with a DVD player. A novel technique is developed to keep the Stand-By power consumption of Flyback SMPS under 1W and a boost type of Active Power Factor Correction (Active PFC) preconverter is...

Quasi−square wave resonant converters also known as Quasi−Resonant (QR) converter are widely used in the adaptor market. They allow designing flyback Switched−Mode Power Supply (SMPS) with reduced Electro−Magnetic Interference (EMI) signature and improved efficiency. However, as the switching frequency of QR converter increases as the load decreases, the frequency must be limited. In traditiona...