一种电流模式PWM开关电源控制器的设计

发布时间：2018-01-08 18:16

本文关键词：一种电流模式PWM开关电源控制器的设计　出处：《大连理工大学》2008年硕士论文　论文类型：学位论文

【摘要】： 近年来,随着我国经济的发展,计算机、通讯等行业对电源产品需求不断的增长,电源控制器的研究已成为国内功率电子学领域中的一大热点。传统的线性稳定电源因为输出精度低、效率低、散热问题大以及很难在一个通用的输入电压范围内工作,逐渐被体积小,重量轻,稳定可靠的开关电源所取代。所以选择以开关电源控制器芯片作为课题,不仅具有理论意义,同时也有很大的经济效益和社会效益。基于双极工艺,本文主要完成了一种电流型PWM控制器的设计。本文首先分析了脉冲宽度调制(Pulse-width modulation,PWM)控制芯片的工作原理。之后阐述了脉冲宽度调制和脉冲频率调制的工作原理。对电压反馈和电流反馈两种控制模式进行了原理阐述和特点对比,然后根据设计要求进行了本文整体电路的设计。根据功能需要设计了整体电路框图,确定设计参数要求。接着分块设计了芯片内部各个功能模块,包括高增益、宽带宽的PWM比较器、带隙基准电压源、外接定时电容的振荡器、过欠压保护电路、斜坡补偿电路、温度保护电路等。利用Cadence EDA设计工具,对各功能块都进行了仿真。仿真结果表明:这款开关电源芯片,工作温度范围0℃-150℃;工作频率65KHz;最大功率18W,该控制器很好的满足了设计要求,完成了该集成电路的前端设计。整体电路采用华润晶芯1.8μm Bipolar工艺库设计,使用Cadence Spectre作电路仿真,使用Cadence Composer绘制版图,介绍了实现电路的工艺流程和版图层次。对版图进行DRC、LVS验证,完成了整体设计。
[Abstract]:In recent years, with the rapid development of China's economy, computer, communications and other industries to supply products growing demand, research on power supply controller has become a hotspot in the field of power electronics. The traditional linear stable power output because of low precision, low efficiency, large heat and hard work in a general the input voltage range is gradually, small volume, light weight, stable and reliable switching power supply replaced. So the study of switching power supply controller, not only has theoretical significance, but also has great economic and social benefits.
Based on the bipolar technology, this paper mainly completed the design of a current type PWM controller. This paper analyzes the pulse width modulation (Pulse-width modulation, PWM) the working principle of the control chip. After expounding the working principle of pulse width modulation and pulse frequency modulation. The principle and characteristics of comparison of the voltage feedback and current feedback two control mode, and the whole circuit are designed in this paper according to the design requirements.
According to the function need to design the whole circuit diagram, determine the design parameters. Then the function of each chip module design block, including high gain, broadband PWM comparator, bandgap voltage reference, the external timing capacitor oscillator, over-voltage protection circuit, slope compensation circuit, temperature protection circuit using. Cadence EDA design tools, through simulation of the various functional blocks. The simulation results show that the switching power supply chip, the working temperature range of 0 DEG -150 DEG 65KHz; working frequency; the maximum power 18W, the controller is good to meet the design requirements, completed the front-end design of the integrated circuit.
The design of the Huarun core 1.8 m Bipolar Technology Library using Cadence Spectre for the whole circuit, circuit simulation, using the Cadence Composer map, introduces the implementation process and layout level circuit. For DRC, LVS for layout verification, completion of the overall design.

【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2008
【分类号】：TN86

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