Design And Implementation On Detachable Transformer For Satellite Power Supply

Wireless power transmission is a new type of electric power transmission,it breaks the thought that power can only be transmitted through wires,as there is no electrical connection in the power source and power device,this fundamentally eliminates the possibility of producing electric spark in the process of plug or special working conditions or causing power supply loop short circuit.so as to avoid the disasters caused by such accidents.In this paper,in order to solve the inherent bottleneck which influences the reliability of spacecraft,the wireless transmission technology is applied to the satellite solar panel-accumulator battery power supply system,furthermore,this paper has carried out a series of theoretical and experimental research in view of the key components-detachable transformer of the contactless power transmission system.Firstly,in this paper,research background,research status and development trend are briefly introduced.The composition of non-contact solar panel-accumulator battery power supply system,as well as its working principle and design principles are concretely introduces later;After that,the materials properties,magnetic circuit,transmission and energy loss characteristics of detachable transformer are elaborated,especially,the analysis of the transmission characteristics through establishing mutual inductance equivalent circuit model of transformer,which is used to derive the mathematical expression of primary side input power,secondary side output power and transmission efficiency.And the external and internal parameters which affect transmission efficiency can be found through expression.Then this paper focuses on the design process of detachable transformer: firstly,this paper will select the core structure overall,based on the two-dimensional axisymmetric model,the cylinder coupling iron core structure can be selected according to the extent of the efficiency of the gap distance with finite element simulation analysis method.Then this paper further designs cylinder coupling structure,including the determination of 1J50 Fe-Ni soft magnetic alloy;deducing coupling coefficient expressions with the magnetic circuit of the Ohm's law,and according to it implementing the optimized design of the core's window size,considering the influence of skin effect,choosing the Litz wires specifications;the determination of the number of winding turns with the design method analogy of normal high-frequency transformer.Furthermore,based on a two-dimensional axisymmetric model after optimization design of cylinder coupling structure,this paper researches the influences on the transmission efficiency with different frequency and load values,and determines a proper working frequency load value by COMSOL software.Finally,according to the size from simulation design,the detachable transformer experimental prototype is manufactured.The experimental results show that the transformer can work stably in the high frequency voltage of 100 V,and meet the technical index which is not less than 80% of transmission efficiency;further experiments were carried to analyze the error,and the core material of the hysteresis loss and eddy current loss is the main factor causing the error.Finally,comparing experiment,it is proved that the method which cuts iron core uniformly can effectively reduce the eddy current loss of a low resistivity iron core material.So the research results of this paper can provide some theoretical and practical guidance for the future application of wireless power transmission technology in the aero space field.