摘要:本系统以Buck和Boost斩波电路为核心，以STC89C52RC单片机为主控制器，根据采集分压电路上的电压，通过A/D转换芯片（TLC2543）将采集到的电压转换成数字信号告诉单片机，单片机将所得信号处理，通过LCM12864ZK液晶显示出输入，并判断出电压的高低，控制继电器接通升压电路或者降压电路，系统接通升压电路或者降压电路得到4.0V电压输出，并再次将输出的电压值作为模拟信号通过A/D转换为数字信号告诉单片机，单片机将所得的信号处理控制LCM12864ZK液晶并显示出输出电压值。其中升压电路采用MAX629芯片，降压电路采用mc34063芯片。系统在输入电压范围1V-20V实现自动升降压功能，液晶显示出输入输出电压值。测试表明，作品达到了题目的要求和预期的结果。

关键词：降压电路；升压电路；STC89C52RC；液晶显示

Abstract:This system to Buck and Boost the chopper circuit as the core, with STC89C52RC single chip computer is used as controller based on collection points of piezoelectric road voltage, through the A/D conversion chip (TLC2543) will be collected to the voltage converted into digital signals told A single-chip microcomputer, single chip will be the signal processing, through the LCM12864ZK liquid crystal display the input, and judge the voltage height, the control relay through to Boost circuit or step-down circuits, systems through to Boost circuit or step-down circuit get 4.0 V voltage output, and once again the output voltage value will be as analog signals through the A/D conversion for digital signal told A single-chip microcomputer, SCM took the signal processing control LCM12864ZK liquid crystal and shows that the output voltage. Among them is used to boost MAX629 chip, step-down circuit adopts Mc34063 chip. System in the input voltage range is 1 V-20 V realization of automatic lift pressure function, liquid crystal display the input and output. Tests show that, the work to the topic request and the expected results.

Key words: Buck circuit; Booster circuit; STC89C52RC; Liquid crystal display