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Optimum Design of Switching Regulators by means of Computer-Aided-Design Technique

计算机辅助设计技术对开关稳压器的优化设计

基本信息

批准号：
61550306
负责人：
NINOMIYA Tamotsu
金额：
$ 1.09万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

Switching regulators consist of two stages; one is a power conversion stage, and the other is a feedback-control stage. Several kinds of circuits such as buck, boost and buck-boost converters are used as the power conversion stage. On the other hand, a multi-loop control method is proposed as opposed to a conventional control method. In this multi-loop control method, not only the output voltage, which is the conventional feedback signal but also the reactor current, or the output current, or the differential value of output voltage are used as controlled variables.In this research, at first, a design method for an output filter composed of a reactor and a smoothing capacitor has been investigated which has much influence on the stability of boost and buck-boost converters. The characteristics of the power-conversion stage can be obtained precisely by the state-space-averaging method except the skin effect and proximity effect of reactor, and the effect of parasitic inductances of the … More circuit. Therefore, the design method for the output filter has been accomplished by using the predetermined expressions of the static and dynamic characteristics in the conventional case that the output voltage is an only control variable. However, the dynamic stability which is a constraint to the design of LC filter strongly depends on the method of feedback control. Especially, the stability of switching regulators can be improved considerably by adopting the multi-loop feedback technique. This research has investigated the multi-loop feedback technique where a reactor current is sensed equivalently by integrating the voltage across the transformer in the buck-boost converter, and it has been clarified analytically and experimentally that the multi-loop feedback technique can expand the stable region of the converter and miniaturize the smoothing capacitor. Furthermore, it is shown that the multi-loop feedback technique is superior for the stability improvement and the noise immunity to the conventional PD(proportional+differential) control technique used widely. Next, a basic characteristic has been revealed analytically for a resonant converters which has the prominent features such as high efficiency and low noise at high switching frequency of MHz, and these results are essential materials to develop the CAD system for switching converters. Less

开关稳压器由两级组成；一个是功率转换阶段，另一个是反馈控制阶段。采用降压、升压和降压-升压变换器等几种电路作为功率转换级。另一方面，针对传统的控制方法，提出了一种多回路控制方法。在这种多环控制方法中，不仅以输出电压作为常规反馈信号，还以电抗器电流、输出电流或输出电压的差值作为被控变量。本文首先研究了一种由电抗器和平滑电容组成的输出滤波器的设计方法，该滤波器对升压和降压变换器的稳定性有很大的影响。除电抗器的趋肤效应和邻近效应以及电路寄生电感的影响外，用状态空间平均法可以精确地得到功率转换阶段的特性。因此，在以输出电压为唯一控制变量的常规情况下，采用静态和动态特性的预定表达式来完成输出滤波器的设计方法。而动态稳定性是制约LC滤波器设计的一个重要因素，它在很大程度上依赖于反馈控制方法。特别是采用多环反馈技术，可以大大提高开关稳压器的稳定性。本研究探讨了在升压-升压变换器中，通过对变压器电压进行积分来等效检测电抗器电流的多回路反馈技术，通过分析和实验证明了多回路反馈技术可以扩大变换器的稳定区域，并使平滑电容器小型化。结果表明，多环反馈技术在提高系统稳定性和抗噪声方面优于传统的比例+差分控制技术。其次，分析揭示了谐振变换器在MHz高开关频率下具有高效率、低噪声等突出特点的基本特性，为开发开关变换器CAD系统提供了必要的资料。少