Study On Phase Shifted Control Zero-Voltage-Switched Full-Bridge Converter With Saturable Inductor

In order to make the switching power supply operate with high efficiency and high frequency, since 1970s, soft switching technology is continually researched and developed by domestic and abroad power electronic fields and power supply technology fields. Among them, phase shifted (PS) full bridge (FB) zero-voltage-switched (ZVS) pulse-width-modulated (PWM) DC/DC converter has strong competitive power in big power capacity fields. But it has some limitations such as smaller load range with ZVS and larger circulation energy. The PS-FB-ZVS-PWM DC/DC converter with a saturable inductor utilizes saturable inductor s critical saturable current characteristic and storage energy, to enlarge load range with ZVS and improve output efficiency under light load. It has very important research worth In this thesis, The PS- FB-ZVS PWM DC/DC converter with a saturable inductor is deeply studied in detail. The following is the main point:Based on the operation principle of the PS-FB-ZVS-PWM DC/DC converter, the thesis researches the transient operation of the PS-FB-ZVS-PWM DC/DC converter with a saturable inductor, and comprises the characteristic between them, and verify theory analysis above by computer simulations.According to the research of the converter s transient operation, the thesis presents the design of the resonant parameters and the dead-time setting range of the converters lead leg and lag leg, and I is confirmed by simulation.The thesis analyses the effect of phase shift control and the utilization of the transformers primary sides saturable inductor to the transformers secondary sides voltage duty cycle, and basic on the buck converter s small signal ac model the converter s model is deserved, and infers control to output transfer function.Finally, performances converter s control system design, and simulates to verify it.