集成片上电感高效率降压型直流—直流电压转换器的研究

发布时间：2018-05-06 22:10

本文选题：单片集成 + 封装电感　；参考：《合肥工业大学》2016年硕士论文

【摘要】：在目前的半导体行业中,正如摩尔定律所描述,半导体工艺越来越先进,器件的尺寸越来越小,除了追求速度,另外一个重要方面就是小型化,即单片集成。单片集成的开关电源,符合当下消费电子行业的主流发展趋势,而且可以将内部系统与由封装寄生参数引起的外部谐振电压相隔离,降低芯片外部干扰对内部系统的影响。电感型开关电源中,片外电感占据了PCB的很大一部分空间,此外在开关电源中,高效率也是学者们一直追求和研究的非常重要的性能参数,所以,对于集成片上电感高效率开关电源的研究就变得非常具有吸引力。本文主要提出一种片上集成电感高效率降压型直流-直流转换器换器(Buck DC-DC Converter)。转换器在1.8V输入电压下得到0.9V输出电压,开关频率提高到了50MHz,最大负载电流可达500mA,输出电压最大纹波小于100mV。本文采用一种新颖的封装电感来实现电感的片上集成,封装电感利用焊线(Bond-Wire)和封装引线(Lead Frame)的寄生电感构成所需的功率级电感,这种电感既可以节省芯片面积,同时具有较高的Q值,可提高变换器的转换效率；另外,本文采用了双模式控制策略：PWMPSM,使转换器在整个负载范围内都有较高的转换效率。按照设计要求,完成了各个小模块的设计,同时还提出了一些新颖的电路模块,例如过零检测模块和PSM控制模块等。本文基于SMIC 0.18μm混合信号工艺库,使用Cadence Spectre软件对各个小模块和整个环路进行仿真验证。仿真结果显示本文设计的电路符合设计要求,最后对设计的芯片进行了测试,峰值效率为71%,在负载电流为10mA的情况下,仍然有57%的转换效率。
[Abstract]:In the current semiconductor industry, as described by Moore's law, semiconductor technology is becoming more and more advanced and the device size is becoming smaller and smaller. In addition to the pursuit of speed, another important aspect is miniaturization, that is, monolithic integration. The single-chip integrated switching power supply is in line with the mainstream trend of the consumer electronics industry and can isolate the internal system from the external resonant voltage caused by the parasitic parameters of the package and reduce the impact of the external interference on the internal system. In the inductive switching power supply, the off-chip inductance occupies a large part of the space of PCB. In addition, in the switching power supply, high efficiency is also a very important performance parameter that scholars have been pursuing and studying, so, The study of on-chip inductor switching power supply becomes very attractive. In this paper, an on-chip integrated inductor with high efficiency step-down DC / DC converter and buck DC-DC converter is presented. The output voltage of the converter is 0.9V at the input voltage of 1.8V, the switching frequency is increased to 50MHz, the maximum load current can reach 500mAand the maximum ripple of the output voltage is less than 100mV. In this paper, a novel package inductor is used to realize the on-chip integration of the inductor. The parasitic inductance of the package inductor is composed of the parasitic inductance of the soldering wire Bond-Wireand the encapsulated lead frame. This inductance can not only save the area of the chip, but also save the chip area. At the same time, the conversion efficiency of the converter can be improved with higher Q value. In addition, the dual-mode control strategy: PWMPSMis used in this paper, which makes the converter have higher conversion efficiency in the whole load range. According to the design requirements, the design of each module is completed, and some novel circuit modules, such as zero-crossing detection module and PSM control module, are also proposed. Based on the SMIC 0.18 渭 m mixed signal process library, the Cadence Spectre software is used to simulate each small module and the whole loop. The simulation results show that the designed circuit meets the requirements of the design. Finally, the designed chip is tested, the peak efficiency is 71 and the conversion efficiency is still 57% when the load current is 10mA.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM46

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