Research On Key Technologies Of High Frequency Resonant Power Supply System In Leo Mobile Communication Satellite

For future space applications such as Low Earth Orbit?LEO?mobile communication satellites,traditional schemes are difficult to meet the power supply system demand.Non-switching converters,such as high-frequency resonant power converters and high-bandwidth linear power converters will improve existing power supply system.The improvements include:using Wireless Power Transmission?WPT?in Solar Array Driving Apparatus?SADA?to replace mechanical contact caused by the sliding ring;using high-frequency AC?HFAC?power bus in power supply system instead of traditional DC power bus;using high-precision high-bandwidth linear current source and high-efficiency high-bandwidth tracking power supply to meet the demand of load in future space satellite.According to the demand of power conversion in LEO mobile communication satellites,this dissertation will include:single-switch resonant converter to realize HFAC power supply,its combination with inductive coupled WPT system,the three-port model for linear power converters and relevant high-bandwidth applications.This dissertation will comprehensively discuss key technologies in future space satellite power supply system.The single-switch resonant power converters are used to meet the requirements of high-frequency and high-reliability for AC distribution system.Several improvements have been realized including:the method of parameter configuration is reconsidered to realize quasi-optimal operation condition;using series-parallel resonant tank to realize low load adjustment rate and zero-voltage switching?ZVS?on switch;and using Class-E/F₂ resonant converters as replacements of Class-E converters to eliminate second harmonic,reducing the stress of switch,and solving the bias current on transformer magnetic.HFAC bus can be realized with these improvements,which meets requirements of low cross regulation for multiple isolated outputs applications or low ripple for high output voltage applications.In the case of different coupling coefficients caused by structural differences in the WPT system of SADA,different resonance tanks are selected to meet requirements of efficiency and load regulation.Then,the WPT system of SADA can be realized by combining with single-switch resonant converters.On the premise of series resonance at transmitter,SN resonant network?non-resonant at receiver?can be used to construct Class-E/F₂ LLC resonant converter,which is suitable for high coupling coefficient system and has low load adjustment rate;SP resonant network?parallel resonance at receiver?can be used to construct Class-E/F₂ LC-LC resonant converter,which is suitable for medium-low coupling coefficient system and has low load adjustment rate;SS resonant network?series resonance at receiver?can be used to construct Class-E-E synchronous rectification converter,which is suitable for low coupling coefficient condition with high efficiency.For high-bandwidth linear converter applications in satellites such as high-slew-rate current source and high-bandwidth tracking power supply,a high-frequency three-port model is proposed which includes parasitic parameters,limited gain bandwidth product?GBW?,sources and loads effects.This model also includes various cross-effects between ports.Due to the demand of high-power,high-precision and high-slew-rate excitation current source,a fully differential and dual operational amplifier current source topology is proposed according to the three-port model.This topology solves the contradiction of dynamic response,stability and accuracy,and reduces the influence of ground reference difference in the case of multi-channel parallel structure.A multi-level switching and linear hybrid tracking power supply topology is adopted to meet the demand of high tracking bandwidth and to increase the efficiency of radio frequency power amplifier?RFPA?in satellites.The linear tracking power supply output voltage is expanded by separating of different function module.The glitches on output voltage caused by high-order harmonics of the multi-level switching supply are suppress by a proposed second-order filter with damper in finite impedance.Considering the delay between multilevel supply and linear tracking power supply output,an improved quantitative calculation of delay is introduced and the synchronous filter are used to match this delay.In addition,the high-bandwidth tracking power supply is under experiments in time domain and frequency domain in cases of various waveforms.For the signal with high peak-to-average power ratio?PAPR?,a remarkable efficiency improvement is obtained in experiments.