《1.25～24V_可调直流稳压电源》.docVIP

课程设计(论文)说明书 题 目：1.25～24V 可调直流稳压电源 院 （系）： 专 业： 学生姓名： 学 号： 指导教师： 职 称： 2010 年 11 月 30 日 摘 要 本次设计介绍了1.25～24V 可调直流稳压电源电路的3 种设计方案，分别为晶体管串联式可调直流稳压电源电路、三端集成稳压器式可调直流稳压电源电路和用单片机制作的可调直流稳压电源电路。并较详细地阐述了单相交流变压器的降压工作原理，单相桥式整流电路的整流原理和LM317系列三端集成稳压器的稳压工作原理及其特点。由单相交流变压器、单相桥式整流电路、滤波电容和LM317系列三端集成稳压器共同构建成一个可调直流稳压电源，并通过实验验证了其可行性。 关键词：持续可调；直流稳压；电源 Abstract This design introduces 1.25 ~ 24V adjustable direct current voltage-stabilized source circuit of 3 kinds of design scheme, respectively transistor tandemvibratory adjustable dc voltage power supply circuit, three end integrated stabilizer type adjustable direct current voltage-stabilized source circuit and MCU making adjustable direct current voltage-stabilized source circuit. And in detail the single-phase ac transformer step-down working principle and single-phase bridge rectifier circuit of the rectifier principle and LM317 series voltage regulator of three end integrated working principle and characteristic. By single-phase ac transformer, single-phase bridge rectifier circuit and filter capacitance and LM317 series three end integrated stabilizer building common into an adjustable dc voltage stabilizer, and proves its feasibility. Key words : Continuous adjustable ; Dc voltage ; power 目 录 引言 ·························································3 1 设计要求···················································4 1.1 直流稳压电源的种类及选用······································4 1.2 串联型直流稳压电源的设计要求···································4 2 设计的具体实现·············································4 2.1 系统概述····················································4 2.2?单元电路设计与分析············································6 2.2.1降压电路···················································7 2.2.2整流电路···················································7 2.2.3滤波电路···················································9 2.2.4稳