Research On The Boost Transformation Of Aerospace Laser Power Supply Based On SiC

As the capability of power supply technology for aerospace applications continues to improve,Space-based laser weapons,such as those found in sci-fi films,are beginning to become realistic and have been widely used in land and sea testing in many countries.According to the given technical index of the project,the module of laser power boost transformation(secondary distribution power supply)for aerospace is studied.Details are as follows:Astronaut-class laser power supply is constrained by space,environment and temperature in primary DC bus transmission.The initial energy source of the laser power requires an increase in voltage.Considering its output voltage,volume,system power and conversion efficiency,Based on the analysis of various topologies,the non-insulated staggered parallel CRM-Boost DC-DC topology is ultimately adopted to analyse the working principle and benefits of topology.Two strategies for voltage staggered parallel open-loop phase shift control are inadequate.A tracking control strategy with closed loop staggered parallel is proposed and analyzed.To maintain stable dynamic output characteristics,to reduce current ripple,to improve efficiency,and to reduce power device losses,a reverse coupled inductor staggered parallel CRM-Boost DC-DC topology with three magnetic core is proposed.The working mode of the topology is analyzed.Equivalent steady state inductors Leq1 and Leq3 and transient equivalent inductors Leq2 in this circuit are analyzed.Coupled inductors are analyzed by considering the magnetic core structure,flux density,resistivity,flux chain and air gap.We calculate the relationship between inductance and mutual inductance as well as the coupling coefficient and choose optimal parameters.Aiming at this topology,a balanced control strategy with closed loop staggered parallel is proposed.In conclusion,a hardware experiment platform was constructed,and an experimental prototype of a parallel CRM-Boost DC-DC converter with reverse coupling was constructed with a fixed power of 1k W,100 V DC bus input,300 V stable output voltage and 98% efficiency was designed.According to aerospace applications and power requirements,the overall structure and control parameters of the converter are designed,as well as the type of Si C power device operating at high frequencies,the selection of high voltage and temperature,the design of the driving circuit,the theoretical modeling of the voltage circuit are analyzed,and the simulation models of discrete inductance and coupling inductance interleave parallel converter are built by PSIM.The dynamic response characteristics of the converter are analyzed.According to the simulation waveform and experimental waveform,the coupling inductor makes its efficiency,loss and ripple dynamic response error better,and proves the rationality and feasibility of the designed laser power booster conversion module.