本科毕业设计__低电压输入的dcdc稳压电源的设计.doc

低电压输入的DC-DC稳压电源的设计 摘要 本课题主要设计了一款升压型的稳压电源，主要运用boost拓扑结构对低电压进行升压，实现输出电压的提高，其主要原理是主要通过开关管控制电源对电感充电的时间，通过电感对电容的充电实现升压，最终通过PWM的占空比的控制来实现稳压。 本课题选用芯片UC3843作为开关电源的控制芯片，对其引脚功能及优势进行了详细的介绍，并介绍了几种现在流行的稳压电源的设计方案，并进行比较，选择最优方案。因saber软件具有完善的性能、全面的算法体系、高度的可靠性，此稳压电源的仿真模拟实验选择在saber软件的环境下进行，也对仿真结果中的波形图进行详细分析。硬件电路结构方面也有详细的介绍，本文主要运用boost的电路结构进行升压实现，外部器件少，结构简洁，原理简单。输出电压端接反馈电阻，通过反馈电阻对输出电压进行取样后反馈到芯片上，芯片通过内部电路自动对输出的PWM信号的占空比进行调节。由于开关电源具有高效，节能的特性，而逐渐取代线性电源被广泛应用。目前开关稳压电源在市场上发展迅猛，主要应用在航海、电力电子技术等广阔领域。 关键字：UC3843 boost拓扑结构 升压稳压电路 saber软件 Low Voltage DC Input The Design of DC Regulated Power Supply ABSTRACT This topic mainly designed a booster type regulated power supply, the main use of the boost topology for low input voltage booster circuit implementation, USES UC3843 chip as the core design of peripheral circuit, the chip itself oscillator, followed by the boost structure to realize the improvement of the output voltage, through core chip internal feedback set stable output voltage value. Its output feedback and compensation relies heavily on UC3843 chip implementation, function and advantages of this topic on the chip pin in detail, this topic introduces several popular now regulated power supply design, and comparison, choose the optimal solution, because the saber software to improve the performance of the system, high reliability, comprehensive algorithm, the simulation experiment of regulated power supply choice under the environment of the saber software, also have detailed waveform figure on the results of simulation analysis and each chip pins waveform is introduced. Hardware circuit structure also has a detailed introduction, in this paper, we use the boost circuit structure of the booster, the external device is little, structure is compact, simple principle. Mainly through the switch tube to control the power of inductive charging time of time, through inductive charging and discharging of capacitance booster to the regulated process. So as to realize the output of