Design and Development of Auxiliary Switching Power Supply in Power Converters

The operation of RCD clamped flyback converter based on peak current control is presented, and the design criterion of the key parameter such as RCD clamp circuit is proposed. The designed and developed auxiliary switching power supply, i.e. 15W 220V 50Hz AC/270V DC/+15V DC(0.8A),-15V DC(0.15A),+5V DC(0.2A), has excellent comprehensive performances such as high power density, high conversion efficiency, strong ability of overload and short circuit, high reliability. This auxiliary switching power supply has the important application value on AC/AC, DC/AC, AC/DC and DC/DC power converters.