Analysis of Improved Phase-shift Full-bridge Converter for New Energy Generation
Phase-shifting full-bridge converters are widely used in new energy generation to realize soft switching technology and reduce switching loss.However,the traditional phase-shifted full-bridge DC-DC converter is difficult to realize ZVS under light load,which leads to low efficiency in high-power output and easy to produce peak voltage and current during circuit switching.To solve this problem,an improved active soft-switched phase-shifted full-bridge DC-DC converter topology is proposed.Firstly,the topology structure of the improved converter is proposed,and on this basis,the working mode of the converter is studied and analyzed,and the selection of related devices is reasonably optimized.Finally,the system simulation and experimental test are carried out through the system simulation and experimental platform.The results show that the improved phase-shifted full-bridge DC converter with auxiliary circuit is designed under light load.It can make the converter lag arm achieve the soft switching effect,and at the same time,in the case of high-power output,the device heating and voltage waveform oscillation have a better inhibition effect,the overall efficiency of the system becomes higher,and the reliability and stability become stronger.
Active soft switchauxiliary circuitphase-shifted full bridge(PSFB)topology
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