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)-展示頁
2025-05-27 09:05本頁面
【正文】 basevoltage of V is yielded on pin16 of the chip that is partially used as parameter voltage input Ui. The chip includes a sawtoothwave generator. Rt and Ct are the external resis tance and capacity that determine the sawtoothwave’ s of the chip is a positivephase input port. Voltage input Ui is putted to the port, here Ui =2. 5 V. Pin1 of the chip is the negativephase input port where the feedback voltage is of the chip is the output end of the inside amplifier of the chip. The proper resistance and capacitor are connected between the pin1 and pin9 to realize pensation of the DCDC is the integral capacitor. The integral pensator is adopted as the systempensation of the system. The PWM impulses are yielded from pin11 and pin14 of the chip. When the PWM control circuit operates normally, Ui on the pin2 and Ub on the pin1 should be balanced. When Ub is not equal to Ui , the PWM width can be automatically adjusted by the PWM control circuit to make Ub equal to Ui. By this way we can control the output voltage of the convertor. Fig. 3 The connection circuit for the PWM control chip SG3525 Drive Circuit The drive circuit of IGBT usually adopts a pulsetransformer or an opto coupler to isolate the power circuit from the control circuit. An individual power supply is needed if an optocoupler is used, which increases the plexity of the system. So the isolationcircuit adopt s a pulsetransformer showed in Fig. 4. Transistors BG1 and BG2 in Fig. 4 pose a plementation power amplification circuit. T2 is the pulsetransformer that isolates the power circuit from the control circuit. R5 and C8 pose the acceleration circuit. The diode D6 eliminates negative impulses. The diode D7 and transistor BG3 pose the rapid discharge circuit of the distributing capacitor at the control pole of IGBT. Fig. 4 Principle circuit for IGBT drive 2 Modeling and Control Modeling The DCDC convertor is a voltage negative feedbacksystem. Aiming to obtain the better dynamic and static characteristic we must model and analyse it in theory. According to Ref. [ 1 ] ,DCDC convertors are the approximate secondorder systems. In order to obtain accurate parameters , the method of the systemresponse to a unit stepfunction input is adopted in this paper. Measuring the OpenLoop System’ s Response to a Unit StepFunction Input The block diagram for measuring is shown in Fig. 5. The concrete method is described as follows : ① The voltage feedback signal is cut off 。 automatic control 。外文原文 Principle, Modeling and Control of DCDC Convertors for EV ZHAN G Chengning , SUN Fengchun , ZHAN G Wang (School of Vehicle and Transportation Engineering , Beijing Institute of Technology , Beijing 100081) Abstract : DCDC convertors can convert the EV’ s highvoltage DC pow
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