多工作模式离线式开关IC的研究与设计-微电子学与固体电子学专业论文.docxVIP

万方数据 万方数据 摘要 摘 要 电源为电子设备提供动力，是电子设备正常工作的基础。近年来，电子设备 越来越小且成本越来越低，这都对电源提出了更高的要求。电源开始向轻、薄、 高效率等方向发展。离线反激式变换器以其易于实现、允许较宽的输入电压和低 成本等优点，而广泛地应用于手机充电器、笔记本适配器和显示器。 本课题涉及一款多模式离线式开关 IC 的设计。该芯片以经济而高效地方式集 成了 700V 的功率 MOSFET、多工作模式的 PWM 控制器、高压电流源、振荡器以 及各种保护电路。本文的主要内容如下：(1)分析反激变换器的工作原理，并介绍 了常用的 PWM 控制技术、调制模式以及隔离技术，为本次设计提供理论支持。(2) 设计和仿真了各个子模块，并对多工作模式的实现进行分析和研究。(3)采用 3μm 的 BCD 工艺库，利用 HSPICE 仿真软件对电路进行整体仿真验证。(4)对芯片的多 工作模式特性进行实片测试，以此验证芯片设计的正确性。 本次设计，主要对电路的子模块进行了仿真和设计，并对多工作模式的切换 进行分析和研究。通过电路的整体仿真和实片测试，证明芯片多工作模式的特性 能很好地实现，也验证了电路设计的成功。 关键词：多工作模式，离线式，AC/DC，Flyback I ABSTRACT ABSTRACT Power supplies provide power for electronic equipments which are the foundation of the electronic equipments’ normal operation. Recent years, miniaturization and low cost of electronic equipments improve requirements of power supplies. Power supplies confirm to the trend becoming lighter, thinner and higher efficiency.Because of the advantages of easy realization, high input voltage and low cost, off-line flyback converter widely applied to call phone chargers, notebook adapter and monitor. In this paper, I design a multi-mode off-line switch IC. This chip integrated 700V power MOSFET, multi-mode PWM controller, high voltage current source, oscillator and various protection circuits in an economic and efficient way.The main work of this paper as follows:(1)Analysis working principle of flyback converter and introduce PWM control technology, modulation mode and isolation technology, all of these provide theoretical support for this design.(2)Design several sub-blocks and analysis the working principle of multi-mode.(3)Based on 3μm BCD process, the whole circuit is simulated by HSPICE software.(4)Testing the multi-mode characteristics of this chip, which verify the correctness of chip design. In this design, my main job is design of sub-blocks and analysis of multi-mode. The data of simulation and test, verify that the characteristics of muti-mode has been realized, also proved the circuit design is successful. Ke