一种数字式可调稳压电源系统的设计

Design of a Adjustable Digital Power Supply System

针对自动检测等应用系统对直流稳压电源的需求,设计了一种数字式可调稳压电源系统;该数字式可调稳压电源系统选择单片机(AT89S51)作为核心控制部件,外围模块电路包括MCP4921构成的AD转换模块、基于集成运放LM324设计的电压电流放大模块与采样电压降压模块、液晶显示模块及基于78系列、79系列集成稳压芯片设计的电源供电模块;系统软件设计采用C语言进行了模块化程序结构设计;测试结果表明:该系统输出可调直流电压范围为0~12 V、输出直流电流为500 mA、电压误差小于0.1 V,且可以通过键盘电路进行目标电压的设置;具有设计简单、输出电压稳定、性能可靠等特点。

Aiming at the requirement of DC power supply for automatic detection and other application systems,a digital adjustable power supply system is designed.The digital adjustable power supply system selects the single chip microcomputer(AT89S51)as the core control component.The peripheral module circuit includes the AD conversion module composed of MCP4921,the voltage and current amplification module and the sampling voltage step-down module based on the integrated operational amplifier LM324,and the LCD display module and power supply module based on 78 series,79 series integrated voltage regulator chip design.The system software design uses C language to design the modular program structure.The test results show that the adjustable DC voltage range of the system is 0~12 V,the output DC current is 500 mA,the voltage error is less than 0.1 V,and the target voltage can be set through the keyboard circuit.It has the characteristics of simple design,stable output voltage and reliable performance.