Design Of High-freqency Switching Power Supply

The paper analyze the present situation and development of high frequency switching power supply(HF SPIS) domestically and overseas, study and research the basal principle of HF SPS and its application in electric power system, then design HF SPS applied in electric power system in order to replace the old supply controlled by phase angle. The Buck full brige converter is made up of four MOSFET, and the theory of PWis used. The signal of PWis offered by controller UC3825. The feedback voltage achieved from output is used to control the change of the output. The primary circuit and the control circuit are insulated by transformer or photocoupler. The Soft_Start and the Over Current Self protection are also designed. The experimental results show that the system can work safely and reliably.