基于Multisim的升压直流稳压电源的仿真基于Multisim的升压直流稳压电源的仿真摘要摘要开关电源是利用现代电力电子技术,控制开关管开通和关断的时间比率,维持稳定输出电压的一种电源,开关电源一般由脉冲宽度调制(PWM)控制IC和MOSFET构成。
本次设计选择的是Boost升压直流斩波电路,升压直流斩波电路可以分为两部分电路块。
分别为主电路模块,控制电路模块。
主电路模块,主要由全控器件的开通与关断的时间(占空比)来改变输出电压U的大小。
控制电路模块,可用一个UC3842芯片来触发产生一个PWM的控制脉冲来控制全控开关的开通与关断。
为简化Boost变换器的电路设计,应用Multisim对Boost变换器进行建模,并对全部工作过程进行仿真和分析。
根据电路测试显示,电路性能能够很好地满足输出电压的设计要求,并达到了最终升压的目的,从而表明仿真结果正确。
关键词:开关电源,双闭环控制,电流模式控制PWM反馈,MultisimABSTRACTSwitching power supply is the use of modern electronic technology, the control switch turn-on and turn-off time ratio, maintaining the stability of the output voltage of a power supply, switching power supply is usually consists of pulse width modulation ( PWM ) control of IC and MOSFET.This design choice is Boost step-up DC chopper circuit, a boost DC chopper circuit can be divided into two parts of the circuit block. The main circuit module respectively, a control circuit module. The main circuit module, mainly by the control device turn-on and turn-off time ( duty cycle) to change the output voltage U size. The control circuit module, a UC3842 chip to trigger a PWM control pulse to control the switch turn-on and turn-off.In order to simplify the Boost converter circuit design, application of Multisim to Boost converter is modeled, and the entire working process simulation and analysis. According to the circuit test shows that, the performance of the circuit can well meet the requirements of output voltage, and reached the final boosting is achieved, thereby indicating that the simulation result is correct.Key words: Switch power supply, Double loop control, Current mode feedback control PWM, Multisim目录1 电源设计的拟定 (1)1.1前言 (1)351.2论文的主要内容 (5)5662 DC/DC升压斩波变换器的原理分析及设计.. 72.1 概述 (7)72.2工作模态分析及相关理论推导 (8)82.3控制电路模块 (10)101213142.4电流型PWM升压变换器控制芯片设计141415172.5 主电路参数计算 (17)1718191919193 电路仿真与测试 (21)3.1 仿真multisim软件介绍 (21)222425263.2 实验仿真和波形分析 (26)2627总结 (31)致谢 (32)参考文献 (34)目录1 电源设计的拟定1.1前言一般情况下,电源要经过转换才能合乎电子系统使用的需要,如AC/DC 转换器。