Research On High Frequency And High Voltage DC-DC Resonant Converter Based On LCC

In the field of switching power supply,high voltage converter is widely used in military(high-power pulse),aerospace(electric propulsion),industrial(electron beam welding),medical(X-ray),environmental protection(electrostatic dust removal)and other important fields.In order to achieve the high voltage converter of high power density,high efficiency,high reliability and good steady-state performance of development needs,the need to further improve the switch frequency,reduce the loss and optimize the structure of circuit topology,so this paper mainly studies the high frequency high voltage resonant converter based on LCC planar magnetic components and high frequency,voltage doubler rectifier circuit.With times that of the traditional pressure type rectifier circuit structure of LCC resonant converter,the design of the design method of error in order to solve the above problem,firstly analyzes the doubler rectifier circuit structure type of LCC resonant converter working mode and waveform,secondly adopted the fundamental wave equivalent analysis method and the cascade type design of LCC resonant converter is the equivalent reduction,this paper proposes a steady-state equivalent circuit model and the design method of RC finally discussed the main design parameters on the properties of high voltage converter,with the help of the proposed design method,main circuit of the parameters for the design of high frequency high voltage prototype plan,The accuracy of the design method is verified by PSIM simulation software.Traditional design method of planar magnetic components more concentrated in the low pressure area and the design error is bigger,based on the traditional design method of planar magnetic components on the basis of further put forward a applicable to the design method of high frequency high voltage planar magnetic components,and analyzes the high frequency plane the stray inductance and high frequency high voltage planar transformer parameters and loss factor,introduced the improved measures and methods,and through the finite element simulation software to verify the accuracy of design method of MAXWELL.The application of voltage doubling rectifier circuit in the high voltage field has many advantages over bridge rectifier circuit,but in the design of voltage doubling rectifier circuit is often used in the design of equal capacitance is not the optimal design method,in the case of large current output,the carrying capacity is poor,voltage drop and voltage ripple are large.In order to solve the above problems,through the analysis of the charge transfer method was deduced output voltage doubler rectifier circuit,voltage drop and voltage ripple formula,based on this,advances a kind of optimized design method of capacitance distribution SIMPLIS software simulation results show that the proposed method can effectively increase the voltage doubling rectifying circuit of voltage gain,efficiency,reduce the voltage drop,and reduce the voltage ripple.In this paper,an experimental prototype with full load output of 50 W and output voltage of 5k V was designed and made in the laboratory.By analyzing the data and waveform of the experimental results of the prototype,the correctness of theoretical analysis and simulation results was proved.The designed prototype achieved an efficiency of 87% under the rated power status.