Control scheme design for isolated Swiss-rectifier based on phase-shifted full-bridge topology

摘要

Swiss-rectifier is a family of high efficient AC-DC topologies. It's a combination of an input voltage selector and two symmetric DC-DC converters. In order to obtain an isolated single-stage rectifier system, the forward converter is used to replace the DC-DC converter in the recently study. However, the hard switching operation of forward converter is unfavorable to increase the working frequency of the magnetic elements. By replacing the forward converter with the phase-shifted full-bridge, the intensive stress of switches is released and the ZVS condition of high-frequency switches can be achieved. Compared with the currently Swiss-forward rectifier, the soft switching modulation mode and duty cycle loss must be considered into the new control scheme of the Swiss phase-shift full-bridge rectifier (SPFR). As a result, the control scheme design is shown in this paper and its characteristics are verified by the experimental results of a prototype.