| High voltage DC resonant power supply is used extensively in the field of medical devices,industrial production,etc.With the developing of science and technology,there are different needs of output voltage and output power of high voltage DC resonant power supply in different applied fields.But high voltage DC resonant power supply has been usually customized developed in specified area,which lead high cost,low adaptability.In this paper the modular technology and high voltage DC resonant power supply have been combined,the topology and control strategy of AC/DC part and DC/DC part of modular high voltage DC resonant power supply have been studied.By the modular combined,the power supply realizes the requirements of different output voltage and different output power.VIENNA rectifier has been adopted by the research of the topology of AC/DC part.A strategy of different current sections sharing modulated wave is proposed,which has balanced the DC bus neutral-point voltage and reduced the complexities of controller of VIENNA rectifier.The Input-parallel and output-parallel VIENNA rectifier has been used based on the research of modular combination modes in AC/DC part of modular high voltage resonant power supply.The unbalance of the input/output current by the different circuit parameters of modules has been studied.Therefore,d-axis current regulation has been proposed controls d-axis current of different modules follow the parallel modules circulating current to regulate switching signals.By Which method the balance of input/output current has been achieved.The Simulink analysis proves the working performance.The input-parallel output-series LCC resonant converter has been adopted based on the research of modular combination modes in DC/DC part of modular high voltage resonant power supply.The output-voltage direct control method has been proposed which solves the problem of the unbalance of output-voltage of modules caused by different circuit parameters.The modular high voltage DC resonant power supply model has been set up.Its load simulation result shows that,the low harmonics content and current sharing of input current of AC/DC part have been achieved,while the stable output voltage and the balancing output voltage of modules of DC/DC part has been fulfilled when these two parts circuit parameter are different. |
