外文翻译---电动汽车DC-DC电源转换器的原理建模和控制.docVIP

外文原文 Principle, Modeling and Control of DC-DC Convertors for EV ZHAN G Cheng-ning , 　SUN Feng-chun , 　ZHAN G Wang (School of Vehicle and Transportation Engineering , Beijing Institute of Technology , Beijing 100081) Abstract : DC-DC convertors can convert the EV?s high-voltage DC power supply into the lowvoltage DC power supply. In order to design an excellent convertor one must be guided by theory of automatic control. The principle and the method of design, modeling and control for DC-DC convertors of EV are introduced. The method of the system-response to a unit step-function input and the frequency-response method are applied to researching the convertor?s mat- hematics model and control characteristic. Experiments show that the designed DC-DC convertor’s output voltage precision is high , the antijamming ability is strong and the adjustable performance is fast and smooth. Key words: EV ; DC-DC convertors ; automatic control ; mathematics model ; Bode drawing CLC number : U 469-72 　　　Document code : A Generally there are two power supplies in EV. One is the DC high-voltage power supply that is used by high power devices such as traction motors and air conditioners etc. The other is the DC low-voltage power supply that is usually used in some control circuit and low-voltage electrical devices such as the inst- rument and lighting. It s rating voltage is 24 V or 12 V. The low-voltage power supply can be gained from the high-voltage power supply by a DC-DC conver- tor. In this paper, the main performance of the designed convertor is that the input voltage range is from DC 250 V to DC 450 V , the output voltage is DC 24 V , the maximum output current is DC 20 A , and the output precision is 1 %. 1 　Principle of the Convertor 1.1 　The Block Diagram of the DC-DC Convertor The block diagram of the DC-DC convertor is showed in Fig. 1. The battery series provide the DC high-voltage input Us. The low-voltage output of the con- vertor is Uo. The setting value Ui of the co