单片机毕业设计835450.doc

论文题目： 专 业： 本 科 生： 指导老师： （签名） 摘 要 本设计依照一般普通用户对电源的参数的要求，提出了一种基于脉冲宽度调制(PWM)高效率、低功耗开关电源直流电压转换器的设计方法, 采用全桥、降压、推挽回路为主电路拓扑，8051F350单片机和STC5616AD单片机分别输出正负电源基准，二者之间相互通信，与TL494斩控芯片相结合进行脉冲宽度调制，使输出电压在-30V-+30V可调。其中8051F350单片机对输出电压和电流进行采样形成高精度的电压电流反馈，STC5616AD单片机负责编码电位器的编码检测和可调电压和电流输出显示。 通过参数设计与最终实验测试，系统达到了以下指标：电源输出电压在-30V-+30V电压可调，并固定±12V和±5V输出，最大输出电流为5A,总功率为420瓦，电压调整率为0.016%，负载调整率为0.41%，电源效率为75%。 关键词： TL494，脉宽调制，开关电源，PWM Subject :The Hardware Designe Of Swith Power Supply Specialty :Automation Name :Liang Gan (Signature)＿＿＿＿ InstructorSignature)＿＿＿＿ABSTRACT According to the common consumer’s request for the parameter of power source, a design method of DC voltage switching power is proposed. which is based on PWM modulates and has high efficiency and low power loss. It uses entire bridge, voltage dropping and push-pull to return route as primarily electric circuit topology. The 8051F350 and STC5616AD separately outputs the positive and negative power source datum. Corresponding with each other, the two MCU control the pulse width modulation with TL494, The output voltage is adjusted in - 30V-+30V. 8051F350 carries on the sampling to the output voltage and the electric current to form a high accuracy voltage and current feedback. STC5616AD is responsible to code potentiometers code examination and display the output variable voltage and electric current. Through parameter design and final experimental test, the design switching power achieved the following indicators: output voltage can be adjusted in -30V-+30 V and fixed output ± 12V and ± 5V; the maximum output current is 5A; the total power is 420 watts; the voltage regulation rate is 0.016%; The load regulation is 0.41%; The power efficiency is 75%. KEY WORDS: TL494，pulse width modulation，switching power supply，PWM第一章 绪论 1 1.1 系统背景 1 1.1.1 绿色节能型开关电源 1 1.1.2 智能化数字电源 1 1.1.3 可编程开关电源 2 1.2 电源技术的发展与方向 2 1.2.1 线性电源和开关电源 2 1.2.2 电源技术的发展方向 3 1.2.3 开关电源的市场前景和研究现状 4 第二章 系统的总体设计 5