新型单电感多输出BOOST型DC-DC转换器的研究与实现

发布时间：2018-07-28 07:09

【摘要】：随着电子产品的快速发展,其内部电路变得更加复杂,集成的单元模块也越来越多。单电感多输出DC-DC转换器只需一个电感就可实现多路输出电压,可以明显的减小产品体积、降低成本,因此对它的研究具有重要意义。本文设计了一款新型的单电感多输出BOOST型DC-DC转换器。为了克服不同输出电压之间的交叉干扰,传统的单电感多输出转换器大多采用TM时序控制、DCM工作模式,而本文采用了一种新型的OPDC时序控制、自适应PCCM模式的技术方案,不但能够有效的抑制交叉干扰,具有更大的带载能力,而且还具有灵活的动态功率输出范围。在内容上,本论文首先对单电感多输出DC-DC转换器的拓扑结构、工作模式以及交叉干扰问题进行了深入的分析研究,在此基础上,重点阐述了自适应PCCM模式、OPDC时序控制的工作原理及优势,并对PCCM模式的功率级进行了小信号建模与分析;然后,设计了一款具有四级动态调整功能的PCCM模式单电感三输出DC-DC转换器,对相关的电路模块进行了设计,并在设计中采取了多项措施来抑制交叉干扰问题;最后,对整个系统进行了仿真与功能验证。本设计基于CSMC0.25μm BCD工艺库,系统开关频率为1MHz,输入电压范围为2.2V~3.2V,三路输出电压设计为:3.3V、4V、5V,转换效率高于80%,仿真结果表明,系统能够在较大的负载范围内输出三路稳定的工作电压,同时交叉干扰问题也得到了有效的控制,完全达到了设计要求。
[Abstract]:With the rapid development of electronic products, the internal circuit becomes more complex and the integrated module is more and more. The single inductor multi output DC-DC converter can realize the multichannel output voltage only with one inductor, which can obviously reduce the product volume and reduce the cost. Therefore, it is of great significance to its research. A new design is designed in this paper. The type of single inductor multiple output BOOST type DC-DC converter. In order to overcome the cross interference between different output voltages, the traditional single inductor multiple output converters mostly use TM timing control and DCM working mode. In this paper, a new type of OPDC timing control and adaptive PCCM mode is used in this paper, which can not only effectively suppress cross drying. In this paper, the topology, working mode and cross interference of the single inductor multiple output DC-DC converter are deeply analyzed and studied. On the basis of this, the adaptive PCCM mode and OPDC timing control are emphasized. The principle and advantages of the PCCM mode power level are modeled and analyzed. Then, a PCCM mode single inductor three output DC-DC converter with four stage dynamic adjustment function is designed, and the related circuit modules are designed. In the design, several measures are taken to suppress the cross interference problem; finally, the whole system is designed. The design is based on the simulation and function verification. The design is based on the CSMC0.25 micron m BCD process library. The switching frequency is 1MHz and the input voltage range is 2.2V~3.2V. The output voltage of the three road is designed to be 3.3V, 4V, 5V, and the conversion efficiency is higher than 80%. The simulation results show that the system can output a stable working voltage of three paths in a larger load range, and the system can simultaneously deliver the operating voltage at the same time. The problem of fork jamming has also been effectively controlled, and has achieved the design requirements.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46

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