外文翻譯---電動(dòng)汽車dc-dc電源轉(zhuǎn)換器的原理、建模和控制-汽車設(shè)計(jì)-全文預(yù)覽
【正文】 3 The Result and Conclusion of Experiment When the load resistance RL = , the experiment data of Us , I s , Uo , Io , η (η is efficiency of the convertor) are shown in Tab. 1. When the load resistance RL = , the experiment data of Us , I s , Uo , Io , η are shown in . 4 Conclusions ① Because the integral pensator is adopted , the output voltage Uo of the convertor has quite high precision even if the input power voltage and the load changes. ② The width of the impulses is adjusted automatically in the convertor to realize constant output voltage value. With the increase of the input voltage the width of the impulses turn narrow , the convertor’ s efficiency drops. In the process of designing a DCDC convertor, we must diminish the adjustable range of the impulse width and make the impulse width wider when the convertor operates. ③ The reasonable value of the resistance and capacitor in the feedback circuit must be selected so that the feedbacksystem has enough gain margin and phase margin that can guarantee the controlsystem to be adjusted smoothly. References: [1 ] Cai Xuansan , Gong Shaowen. Highfrequency electronics (in Chinese) [ M].Beijing : Science Press , 1994. 232 246. [2] Zhang Wang , Wang Shiliu. Automatic control principle (in Chinese)[M]. Beijing: Beijing Institute of Technology Publishing House , 1994. 71 72. [3 ] D’ Azzo J J. Linear control system analysis and design [M]. San Francisco: McGrawHill Book Company,1981. 83 92. 電動(dòng)汽車 DCDC 電源轉(zhuǎn)換器的原理、建模和控制 張承寧 , 孫逢春 , 張 旺 (北京理工大學(xué)車輛與交通工程學(xué)院 , 北京 100081) 摘要 ： 為了設(shè)計(jì)出在電動(dòng)汽車上把高壓直流電源變換成低壓直流電源的高品質(zhì) DCDC 變換器 ,采用自動(dòng)控制理論進(jìn)行指導(dǎo) . 介紹電動(dòng)汽車 DCDC 變換器原理和設(shè)計(jì) ,建模與控制方法 . 應(yīng)用階躍響應(yīng)法、頻率法研究其數(shù)學(xué)模型和控制特性 ,并且進(jìn)行分析和計(jì)算 . 實(shí)驗(yàn)結(jié)果表明 ,用這種方法所研制 的電動(dòng)汽車 DCDC 變換器輸出電壓精度高 ,抗干擾能力強(qiáng) ,調(diào)節(jié)特性快速、平穩(wěn) . 關(guān)鍵詞： 電動(dòng)汽車 。 ③ Ui0 is superimposed with d Ui that is posed by positive and negative rectangle wave impulses. The amplitude of d Ui is taken to be equal to . It should make d Uo be easy to be observed to select the rectangle wave frequency , adopting f 1 = 400 Hz 。 automatic control 。 DCDC convertors 。 ② The setting value of the chip SG3525 adopts the middling value Ui0 to make the width of an impulse be about T 。 output and input’ s incremental ratio K0 = d Uo/ d Ui = 10/ 1 = 10. The measuring block diagram of the openloop system Fig. 6 The systemresponse to a unit stepfunction input Determining the OpenLoop Transfer Function According to Ref s. [2,3 ] , we have the damping ratio ξ , undamped natural frequency ω n and transfer function of controlled object Gp ( s) as follows : In order to ensure that when the output voltage Uo =24 V the feedback voltage to pin1 of the SG3525 is V to balance the input voltage Ui = V, we take the feedback and measuring factor as Kb = Ub/ Uo = 15/
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