Utilizing mag amp technique in flyback converter

Mag amps have been widely used in forward converters to provide multiple regulated outputs. Owing to the inherent property of forward converter, bleed resistors are added in each output to ensure output voltage will not rise under light load condition. These added bleed resistors waste power and decrease circuit stability, it is worse when the number of outputs is increased. This paper presents a mag amp assisted flyback converter, which can provide multiple regulated outputs and only one output, which has no mag amp in front of its rectifier, has the minimum load requirement. Circuit operating principles and design considerations are introduced. Experimental results demonstrate that multiple regulated outputs can be obtained and only one bleed resistor is needed for the switching delay introduced by the mag amp.