具有死区时间校正的三态直流—直流转换器研究与设计

发布时间：2018-05-30 09:32

本文选题：死区时间校正 + 三态DC-DC转换器　；参考：《天津大学》2014年硕士论文

【摘要】：随着开关电源的日益发展,越来越多的开关电源不仅应用于通讯、航天、工业等领域,在我们日常生活中也随处可见。便携式电子设备的电源大多需要较好的性能和较小的尺寸,开关频率较高,损耗升高因此转换效率相应降低。但在实际应用中,转换效率是开关电源一个非常重要的性能参数,而影响转换效率的一个主要因素就是死区时间,所以研究死区时间的控制方法是非常必要的。本文首先比较了几种直流-直流转换器的拓扑结构和控制方式的优缺点,分析了死区时间控制的基本原理,提出了使用三态直流-直流转换器来检测死区时间控制方法。结合具有功率传输门结构的三态非反相直流-直流转换器,确定了死区时间控制方法的模块,包括体二极管导通检测、体二极管导通脉宽测量和基于系统设计指标的外围电路设计,然后对死区时间控制方法进行了电路具体实现,本文设计的死区时间控制方法可以分辨脉冲调制效应信号的上升沿和下降沿,并且对相应时间沿的死区时间分别修正,通过脉冲宽度调制方法实现了任意三态DC-DC Buck-boost转换器的输入输出。在使用现有的MOSFET产品进行死区时间校正方法的实际验证后,又基于0.18μm工艺进行了相应DC-DC转换器的流片。根据整体电路仿真,三态DC-DC Buck-boost转换器可以实现输入电压范围为2.7V到5.7V,输出电压为0.3V到6.8V,输出电流可以高达6A,转换效率可提高4%。芯片已经成功流片,采用0.18μm Dongbu Hitec工艺进行版图设计,面积为1650μm×2300μm。死区时间修正方法具有修正功能,直流-直流转换器电路正常工作。
[Abstract]:With the development of switching power supply, more and more switching power supply is not only used in communication, aerospace, industry and other fields, but also widely used in our daily life. The power supply of portable electronic equipment mostly needs better performance and smaller size, the switching frequency is higher and the loss is higher, so the conversion efficiency is reduced accordingly. However, in practical application, conversion efficiency is a very important performance parameter of switching power supply, and the dead-time is one of the main factors that affect the conversion efficiency, so it is necessary to study the control method of dead-time. In this paper, the advantages and disadvantages of the topology and control methods of several DC-DC converters are compared, the basic principle of dead-time control is analyzed, and a three-state DC-DC converter is proposed to detect the dead-time control methods. Combined with the three-state non-inverse-phase DC-DC converter with power transmission gate structure, the dead-time control module is determined, including bulk diode conduction detection. The measurement of bulk diode conduction pulse width and the peripheral circuit design based on the system design index are carried out, and then the dead-time control method is realized in detail. The dead-time control method designed in this paper can distinguish the rising and descending edges of the pulse modulation effect signal, and modify the dead time of the corresponding time edge respectively. The input and output of any three-state DC-DC Buck-boost converter is realized by pulse width modulation. After using the existing MOSFET products to verify the dead-time correction method, the corresponding DC-DC converter wafer is carried out based on 0.18 渭 m process. According to the whole circuit simulation, the three-state DC-DC Buck-boost converter can realize the input voltage range from 2.7 V to 5.7 V, the output voltage from 0.3 V to 6.8 V, the output current up to 6A, and the conversion efficiency can be improved by 4%. The chip has been successfully flattened, and the layout is designed by using 0.18 渭 m Dongbu Hitec process, with an area of 1650 渭 m 脳 2300 渭 m. The dead-time correction method has the function of correction and the DC-DC converter circuit works normally.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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