本文论述了直流电子负载的设计思路和过程。本电子负载采用c8051f020单片机作为系统的控制芯片，可实现一下功能：电子负载有恒流和恒压两种模式，可手动切换。恒流方式时要求不论输入电压如何变化（在一定范围内），流过该电子负载的电流恒定，且电流值可设定。工作于恒压方式时，电子负载端电压保持恒定，且可设定，流入电子负载的电流随被测直流电源的电压变化而变化。-This article discusses the DC electronic load design ideas and processes. The electronic load uses c8051f020 microcontroller control chip as the system can achieve what functions: electronic load with constant current and constant voltage modes, you can manually switch. Constant current mode, regardless of the input voltage required to change (within a certain range), flows through the constant current electronic load, and the current value can be set. When operating in constant voltage mode, the electronic load voltage is kept constant, and can be set, the current flowing into electronic load voltage DC power supply with the measured changes.