Study Of DC-DC Power Converters Topologies Based On Power Waveforms Arithmetic Operation

With rapid developments of renewable energy,electroplating and electric vehicles,strict requirements are proposed in DC-DC converters,e.g.,high voltage gain,various output waveforms and low components stresses.Therefore,many advanced topologies are designed and invented,e.g.,Z-source converters,various high-gain converters and switching inductor/capacitor converters,to list jutst a few.However,most of them are designed via inventors’ experience,it still lacks of a systematic design methodolgoy.Hence,different methods are developed,e.g.,basic switching unit method,the dualization method,impedance modulation method and so on.Yet these methods are still not perfect,they are only designed for some specific functions.Inspired by basic arithmetic operation,DC-DC topologies design based on power waveform arithmetic operation is proposed in this dissertation.The main contributions are as follows:（1）In terms of basic arithmetic operation law,combined with the signal digital circuits of addition,subtraction,multiplication and division and proportional integral functions,the DC-DC topology design method of power waveform arithmetic operation is proposed to solve the problems of low output voltage gain,large output voltage ripple and single output waveform.（2）Based on the waveform addition operation of the proposed design method,a high step-pu converter with an X-shaped switching network is designed,specifically to achieve the summation of two staggered output capacitor voltage waveforms.This in turn achieves zero output voltage ripple and also reduces device stress to meet the industrial demand for renewable energy power generation.（3）Based on the waveform subtraction operation of the proposed design method,a nonpulsating input current DC-DC converter is developed.Specifically,the circuit topology is designed to realize the output waveform subtraction to achieve the output of arbitrary waveforms,such as triangle,sine,sawtooth,and rectangle waveforms.It satisfies the requirements of industrial applications such as electroplating field,which requires abundant output waveforms.（4）Based on the waveform multiplication operation of the proposed design method,a high gain converter is presented.Specifically,the step-up modular is cascaded to realize multiplication of the output voltage,which leads to a high output voltage gain.The voltage of the designed converter is required by the electric vehicle battery to the motor.Detailed simulation and experiment are conducted to validate the superiority of the above converter performance,which further verifies the effectiveness of the proposed design method.The innovation of this dissertation is to develop a systematic design method via power waveform arithmetic operation,which is with both practical significance.The proposed metheod can promote the development of systematic design in power converter topology,which will have a good application prospect.