  This paper proposes a new single input multiple output power supply by
integrating a flyback converter and several buck converters. The flyback
converter works as the main regulator, and the buck converters provide series
voltage compensation with the aim of tight regulation. A time multiplexing
switching scheme is proposed to deliver multiple output voltage levels via a
two winding transformer and to eliminate the cross regulation between output
channels. This configuration reduces the size of flyback transformer and filter
capacitors, and consequently improves the overall form factor. A detailed
steady state analysis is conducted on the circuit to obtain the design
criteria. A three output channel power supply is designed and the effectiveness
of the proposed configuration is validated via simulation with a
MATLAB/Simscape model. Simulation results also demonstrate satisfactory
transient response to load changes.
