航天用离子泵高压开关电源分析与设计word格式论文.docxVIP

AbstractIon pump is widely used in the field of aerospace, military, medical and so on. In order to prolong the ion pump’s life, the power supply for ion pump should provide the high quality electrical energy. This thesis for the application study of the ion pump high voltage power supply in space. Design a high voltage switching power supply with output negative resistance characteristics is very important in this area.The main topology of the power supply is cascade topology. The front-end converter is Buck circuit and the after converter is Push-pull circuit with ten steps voltage doubling rectifying circuit. Comparing with the single-stage topology, the cascade topology can reduce the influence of the switch adjustment to the transformer. Using the voltage doubling rectifying circuit can reduce the transformer turns ratios and the parasitic parameters. At the same time, the isolation way is easy to achieve. The article will be given a detailed analysis about the main topology. Then the small signal model of the cascade topology is established. The system stability and the compensation network parameters are analyzed and designed. Make true the system run in the stability working point.In the high voltage power supply, the transformer is the important part to produce the high voltage. In order to making the transformer stable operation, the parameter and winding way of the transformer should be reasonable designed. In addition, using the parameter of the transformer to study soft switching technology to reduce the switching loss and improve the efficiency of the whole power supply.In order to satisfy the output load characteristic curve, the ion pump high voltage switching power supply need to precise sampling the output current. Control circuit adopts the non-insolate style. Make the output voltage changing with the reference voltage. Make sure the power supply can output steady from 0V to 5000V. The power supply can manual output negative resistance characteris