The Design And Research Of The High Dynamic Respose Boost Bi-directional Buck Regulator

With the development of aerospace technology and the expansion of its application,the load characteristics of spacecraft have shown a diversified trend.For multi-load integrated satellites,the payload load operation mode not only includes a stable DC bus load but also adapts to the working condition of a pulsed load,and its instantaneous power can reach several tens of kilowatts.High-power high-frequency pulse load also impacts the DC input terminal and the DC bus and severely shortens the life of the power supply system.In order to meet the new multiple load conditions,new requirements are placed on the dynamic response of the DC bus.The quality of the satellite's power system is 33% of the total satellite quality.The increase in the weight of the power c ontroller will lead to an increase in the quality of the entire satellite.In this paper,an independent and controllable supercapacitor is introduced into the topology based on the integrated power system,and a new topology is proposed,named as 3BR(Boo st BidirectionalBuck Regulator).In order to effectively improve the dynamic response of the topology.Three ways to introduce supercapacitors into topology work are discussed.This paper carefully analyzes the effects of the supercapacitor being directl y mixed with the battery,isolating it from the bus and connecting it to the battery through a bidirectional DC/DC,and their effects on the dynamic response and power density of the entire converter.And adopt the third way to focus on the research of thi s article.Afterwards,the energy flow direction of the converter is discussed.The working state and basic framework of the topology are determined based on the energy point of view,and then the topology evolution is performed from the perspective of the oretical analysis,and the DC gain relationship is analyzed.For this new topology requires an effective control method,this paper presents a three-domain control method based on the super capacitor voltage as a control signal.The control of the free fl ow of energy and busbar ends in solar cells,super capacitors and power storage is realized.According to the topology control strategy,a small signal modeling was performed.The simulation model of high dynamic response 3BR is built in Simplis software and verified by simulation.According to the swept bode diagram,loop correction is performed and reasonable calibration network parameters are designed.A 1.3k W experimental prototype was built.The experiment verifies the feasibility and efficiency of the highly dynamic response 3BR and its control strategy.