Research On High Voltage DC Power Supply Based On LCC Resonant Converter

The series-parallel(LCC)resonant converter is a classic DC-DC converter that not only overcomes the shortcomings of a single series resonant converter(SRC)and parallel resonant converter(PRC),but also combines the advantages of both.In this paper,the topology used in the HVDC power supply system is analyzed and compared,and the LCC resonant converter is determined to be used in this project.The performance of high-voltage and low-ripple power supply with multi-stage voltage doubler rectifier circuit is studied,the equivalent circuit of the voltage doubling rectifier circuit is derived,its equivalent model is established,the voltage drop and ripple formula of the voltage doubling circuit is derived,and the main factors affecting the performance of the voltage doubling circuit are analyzed.At the same time,the relationship between the soft switching and switching frequency of the power device is analyzed,the resonant waveform of the LCC resonant converter is divided according to time,and the time domain equation is written for each section of the column,and the time domain equation is solved,the mathematical expression of the resonant cavity state variable and the resonance parameter and the relationship equation between the resonance parameter and the characteristics of the LCC resonant converter are obtained,the LCC resonant converter small signal model is established,and the transfer function of frequency and load voltage is derived.In Simulink,the LCC resonant converter model was built to experiment with the prototype,and the simulation and experimental results showed the feasibility and correctness of the method..