基于UC3842双闭环反馈实现开关电源  

Switching power supply based on UC3842 double closed-loop feedback

作　　者：韩芬[1] HAN Fen(Department of Electrical and Information Engineering,Xi'an Jiaotong University City College,Shaanxi Xi'an 710018,China)

机构地区：[1]西安交通大学城市学院电气与信息工程系,陕西西安710018

出　　处：《工业仪表与自动化装置》2023年第6期98-101,共4页Industrial Instrumentation & Automation

基　　金：电力电子系统设计实训阶梯式教学内容改革(SJJG03016)。

摘　　要：为了提高开关电源的稳定性,采用控制芯片UC3842电流和电压的双闭环反馈,控制驱动的PWM波形每个周期占空比的大小,实现开关电源的稳定输出。该文对设计的主电路和控制驱动电路利用仿真软件Multisim搭建仿真模型,仿真结果表明设计的合理性。根据仿真模型完成硬件电路并调试,实验结果表明,该文设计的电路合理,利用UC3842设计的电流和电压的双闭环反馈,实现调节驱动波形每个周期占空比的大小,最终达到稳定开关电源输出电压的目的。In order to improve the stability of the switching power supply,this paper adopts the double closed-loop feedback of the current and voltage of the control chip UC3842 to control the duty cycle of the PWM waveform in each cycle to achieve the stable output of the switching power supply.In this paper,the main circuit and control driver circuit are designed by using the simulation software Multisim to build a simulation model,and the simulation results show that the design is reasonable.According to the simulation model,the hardware circuit is completed and debug.The experimental results show that the circuit designed in this paper is reasonable.By using the double closed-loop feedback of current and voltage designed by UC3842,the duty cycle of the driving waveform can be adjusted to stabilize the output voltage of the switching power supply.

关 键 词：开关电源 UC3842 双闭环反馈 

分 类 号：TN386.1[电子电信—物理电子学]