本系统是以凌阳SPCE061A单片机为核心控制器，具有电流可预置、可步进调整、输出的电流信号和预置的电流信号可同时显示的数控直流电流源。系统主要包括：凌阳SPCE061A精简开发板、键盘与显示电路、压控恒流源电路、校正电路、电源电路等。系统中通过键盘按键对电流值进行预置，凌阳SPCE061A单片机送出相应的数字信号，经过D/A转换、信号放大、电平转换、压控恒流源，再输出所需电流；实际输出的电流经过精密电阻变成取样电压信号，经高输入阻抗放大器、A/D转换器，将信号反馈到凌阳SPCE061A单片机中构成闭环控制；通过液晶显示器显示此信号的值。-the system is Sunplus SPCE061A as the core controller, with current can be preset. Stepping can be adjusted to the current output signal and the current signal Preferences can also showed NC DC current source. Systems include : Sunplus SPCE061A streamline the development board, keyboard and display circuit, voltage-controlled current source circuit, Correction Circuit, and the power circuit. System through the keyboard keys on the current values of Preferences, Sunplus SPCE061A send the corresponding digital signal through D / A conversion, signal amplification, level translators, voltage-controlled current source, and the required output current; actual output current through precision resistor voltage signal into sampling, After high input impedance amplifier, A / D converters. feedback