已读电动汽车DC_DC电源变换器的原理_建模和控制_英文_张承宁.pdf.doc

Journal of Beijing Institute of Technology , 2000 , V ol.9, No .4 Article ID :1004-0579(2000)04-0465-07 Principle , Modeling and Control of DC-DC Convertors for EV ZHANG Cheng-ning , SUN Feng-chun , ZHANG Wang (School of V ehicle and T ransportation Engineering , Beijing Institute of T echnology , Beijing 100081) Abstract :DC-DC convertors can convert the EV s high-voltage DC power supply into the low-voltage DC power supply .In o rder to design an ex cellent conv erto r one must be guided by theo-ry of automatic control .The principle and the method of desig n, modeling and control for DC-DC converto rs of EV are introduced.T he me thod of the system-respo nse to a unit step-function input and the frequency-response method are applied to researching the convertor s mathematics model and control characteristic .Experiments show that the designed DC-DC convertor s out-put voltage precision is hig h, the antijamming ability is strong and the adjustable performance is fast and smooth . Key words:EV ;DC-DC conv erto rs;automatic co ntrol ;mathematics model;Bode drawing CLC number :U 469.72 Document code:A Generally there are tw o power supplies in EV .One is the DC high-voltage pow er supply that is used by high pow er devices such as traction motors and air conditioners etc .The o ther is the DC low-voltage pow er supply that is usually used in some control circuit and low-voltage electrical devices such as the instrument and lighting .I ts rating voltage is 24 V or 12 V .The low-voltage pow er supply can be gained from the hig h-voltage power supply by a DC-DC convertor . In this paper , the main perform ance 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 m aximum 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 diag ram of the DC-DC convertor is show ed in Fig .1.The battery series provide