一种可变工作模式的acdc电源管理芯片的设计-design of acdc power management chip with variable working mode.docxVIP

摘要摘要随着电力电子技术的发展，电力电子设备和人们日常的工作生活关系愈发密 切。在九十年代，开关电源开始进入电子设备领域，例如电子监控设备和控制设 备的电源都先后采用了这项新技术。在开关电源带来的众多新技术中，最核心的 就是电源控制芯片，设计出色的电源控制芯片具有高集成度、高性价比、高性能 和简单构造等特点。本文设计的电源控制芯片结构简单、成本低廉，可应用于笔记本、电视、监 控设备等装置的电源以及高性能电池中。 当芯片正常工作时，其工作频率为 100kHz，输出电压约为 12V。当反馈电压低于 0.5V 时，芯片进入跳周期模式。芯 片的特色功能包括上电时的软启动，这可以避免芯片在启动过程中受到过冲损坏； 轻载时，自动进入跳周期模式以提高芯片工作效率；工作环境异常时，芯片自动 进行电路保护。为了实现电路的单片集成，本文的设计使用台积电的 1.0μm SPDM 5V/40V/700V HVCMOS 工艺。本文首先对芯片所需要的模块进行划分设计仿真，然后重点分析和介绍了其 中的几个重要模块， 例如 osc、 reference、 bias、 fb_ctrl 、 digital、 soft-start，最后对芯片的版图做了设计和介绍。本文使用 Calibre 和 Hspice 对电路设计进行了仿真。所有的版图设计都经过 了 DRC 和 LVS 检测。关键词：开关电源，软启动，跳周期模式，占空比，脉宽调制模式ABSTRACTABSTRACTAs the development of technique of electronic, the internship between electronic equipment and people has gone deeply. In 1990s the switching power supply entered the field of electronic equipment, such as electronic supervise power supply and control equipment power supply .The primary technique of switching power supply is control IC, which is used widely because of its high integrity good cost performance simple circuit and high performance.The circuit of this paper is highly evaluated in usage for power supply of laptop battery TV supervisor according to its simple and low cost. In this paper, a current model controlled PWM switching power supply is proposed, which designed by TSMC 1.0μm SPDM 5V/40V/700V HVCMOS technology. When the IC worked fluently, it performs excellently in off-line switching condition. The switching frequency of the IC, which swiches into skip cycle model when lower than 0.5 voltage, in ordinary working condition is 100 k hertz while the VOUT is about 12 voltage with the soft-start to avoid the over current in start process, skip-cycle to improve switching efficiency under light load condition and ovp otp and ocp.In this paper, it introduces the working process of the common current model switching power supply and this novel power supply with the emphasis osc reference bias fb_ctrl digital soft-start ovp otp and ovp parts. The