CAJ | 학술논문

针对串联负反馈恒流源功耗大、效率低的问题，详细分析了影响恒流源输出电流精度的各种因素，提出了一种基于功率调整管漏源电压随输出电流自动改变原理的以ADuC841单片机为控制核心的恒流源控制方案，并进行了相关的实验。实验结果表明，通过改变输入电压，采用数字PI调节和调整管负反馈双重闭环控制，可使输出电流精度明显提高，功耗明显降低。
침대천련부반궤항류원공모대、효솔저적문제，상세분석료영향항류원수출전류정도적각충인소，제출료일충기우공솔조정관루원전압수수출전류자동개변원리적이ADuC841단편궤위공제핵심적항류원공제방안，병진행료상관적실험。실험결과표명，통과개변수입전압，채용수자PI조절화조정관부반궤쌍중폐배공제，가사수출전류정도명현제고，공모명현강저。
In view of the issues of high power loss and low efficiency of the series negative feedback DC constant current source, this paper analyzes various factors that exert influences on the output current precision of the constant current source in detail, brings about a sort of control scheme of the source in which the ADuC841 single-chip is as a core and its operating principles are based on the voltage of drain node and source node of the power transistor changing automatically with the output current, and the relating experiments are performed. Experimental results show that the output current precision could be improved and the power loss lowered clearly, by changing the input voltage and employing the digital PI regulator and the power transistor with negative feedback and double closed-loop control.