2 research outputs found
Design of Series Input Parallel Output Interleaved Flyback Converter for 75W AC-DC Adapter
No full textIn this paper, a series input parallel output (SIPO) interleaved flyback converter for 75W AC-DC adapter is designed by three methods. To improve the efficiency of the SIPO interleaved flyback converter, discontinuous conduction mode (DCM) with valley switching technique is applied to reduce the switching loss at high line, and continuous conduction mode (CCM) is applied to reduce the conduction loss at low line. Since the input voltage is divided by the series input structure, the main switch can use the low voltage-rated switch. In addition, the small size of output-filter can be used by the interleaving operation. Therefore, the SIPO interleaved flyback converter with DCM at high line and CCM at low line, achieves high efficiency and high power density for the low-cost 75W (15V-5A) AC-DC laptop adapter application
A novel accurate primary side control (PSC) method for half-bridge (HB) LLC converter
No full textRecently, several researches have been progressed on the primary-side control (PSC) methods which decrease the size and cost of the control stage. However, most of the researches have been applied to the flyback converter, and they have some challenges in applying them to the half-bridge (HB) LLC converter due to the large voltage across the secondary leakage inductor of the transformer. In this letter, a new PSC method for the HB LLC converter is proposed to obtain accurate output voltage. In the proposed method, the output voltage is regulated by obtaining the voltage across the primary side of the transformer when the external resonant inductor voltage becomes 0 V. At this time, since the voltage across the transformer secondary leakage inductor is small, the proposed method can accurately regulate the output voltage. A 400 V input and 20 V/85 W output laboratory prototype is built and tested to verify the effectiveness of the proposed PSC method
