An Input-Series Multiple-Output Auxiliary DC/DC Converter

An input-series two-transistor flyback DC/DC converter is proposed in this paper, which is suitable for high input voltage multiple-output low power applications. In this DC/DC converter, a common integrated-transformer is adopted, all of the series-modules are operating synchronously, and the active input voltage sharing (IVS) can be achieved efficiently without adding any special controllers. The active IVS mechanism of this converter is analyzed in detail, the design considerations of the flyback integrated-transformer is given, and the feasibility of the proposed converter is verified by the experimental results on a 60W laboratory-made prototype of this converter.