Research On The Technology Of Capacitor-based Pulse Power Source Power Converter

With the maturity of the pulse power source technology,the requirements for small-sized,high-power,high-repetition-rate power converters are getting higher and higher.The transformation and control technology of the capacitor-based pulsed power source power converter is taken as the research object.The LC series resonant power converter was designed and studied from three aspects: theory,simulation and experiment.A full-bridge IGBT topology is used to design a power converter that can charge seven times in one minute.Based on the LC series resonance method,realize high-power constantcurrent charging of the system.The working principle of the full-bridge inverter LC series resonant circuit is analyzed in detail,and the changes of the resonant capacitor voltage and the energy storage capacitor voltage during the working process are derived.The hardware structure and components of the power converter are designed and selected.MC9S12XF512 16-bit microprocessor with Flex Ray bus controller was selected to design the control system of the power converter,which specifically includes a soft start circuit,a current and voltage detection circuit,a temperature detection circuit,and a PWM circuit.The driving of IGBT in the full bridge is designed,and the loss is analyzed and calculated.The highfrequency and high-voltage pulse transformer is designed,including the core selection,the number of winding turns,and the structure,and the transformer loss is analyzed.The leakage phenomenon of the capacitor is analyzed,and a feedback voltage-holding method is designed to automatically compensate the capacitor after the leakage.Flex Ray bus was selected as the communication method according to the design requirements.The initialization of the software system is designed,the MCR of the Flex Ray module is set,and the process of initialization and data transmission and reception of the Flex Ray module is given in detail.SIMULINK was used to simulate and analyze LC series resonant circuits,boost transformers,and high-voltage outputs.The correctness of the fast charging power converter system design was verified through overall simulation.The Flex Ray communication was tested with software.The prototype was tested and the results were satisfactory.The system can achieve the goal of charging 7 times in one minute,and can automatically maintain the voltage.The designed power converter can meet the project requirements and can provide stable and fast charging support for capacitor-based energy storage devices.