摘要
直流稳压电源是日常生活中常用的电子仪器,文章主要论述了一种以51单片机为核心的数字式可调直流电压源的设计原理和实现方法。该设计系统主要包括了微控制器模块、数模转换模块、稳压控制模块、电压/电流采样模块、LED数码管显示模块、键盘模块和电源模块七部分。其中AT89C51单片机为控制单元,单片机控制数模转换芯片DAC0832,输出模拟电压放大5倍后,实现步进为0.1V的电压输出,该电压作为LM317的基准电压;然后利用模数转换芯片ADC0832将采样后的电压、电流转换为数字信号,再通过单片机实现闭环控制。该电压用LED数码管显示电压值,可实现3-15V的电压输出,并且利用按键步进调节电压,步进电压为0.1V。
power supply is the commonly used electronic equipment, this paper mainly discusses the design and the realization of a kind of digital adjustable DC power supply which based on 51 MCU. The DC power supply including the microcontroller module, analog-to-digital conversion module, power control unit, voltage / current sampling module, LED digital tube display module, keyboard module and power supply module, seven parts in total. The control unit using AT89C51 MCU, with the control of MCU, DAC0832 output analog voltage magnified 5 times, achieve the output voltage of 0.1V step, the voltage as the reference voltage of LM317; and then use the ADC0832 of the voltage and current sampling is converted to digital signal, this is a closed-loop control.The output of the DC power supply is displayed by 4 LEDs, the range of the output is 3-15 V, the step voltage is 0.1V.
出处
《电子技术（上海）》
2016年第7期46-48,共3页
Electronic Technology
