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Title: c11-7 Download
 Description: 作原理(电路见附图) 1.上电复位,读取24C02中的电压,送DA转换输出电压,如24C02中电压为0则设置初始电压为5Vo 2.电压控制:通过键盘S1、S2,控制MCU产生8位数字信号(0-255),通过P3口送至8位数模转换芯片(DAC0832)转换成模拟电流信号,再经运放作I/U转换,得到控制稳压电源输出部分的基准电压。 3.电流取样:采用8位模数转换芯片(ADC0804)作为显示电流的模数转换器件,ADC0804的取样电压由串联在电源输出电路的电流取样电阻(0.1Ω)分压取得,并由运放按一定倍数放大后送至Vin(+), ADC0804把转换结果送至单片机的P1口,再由程序将数据处理后送LCD1602显示当前电流。
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