摘要
针对常用的ADC芯片或单片机加DDS技术做信号源存在输出电压不能完全跟随参考基准的问题,提出了采用比例积分控制方式设计的闭环交流信号振幅控制系统,使交流输出电压幅度能完全跟随直流参考基准的稳定度.在交流电压源的基础上配以电压/电流转换电路,可以得到一个性能良好的交流恒流源.测试结果表明,在输出电流为5A时,其交流电流稳定度达到5×10-5.
In general,AC signal is composed by ADC chip or micro-computer with DDS technology,the problem is that the output amplitude of this signal is not able to fully trace to the DC reference accuracy.Through the design of proportional-integral control circuit,the closed-loop AC signal amplitude is well regulated.The stability of AC signal output voltage is indeedly followed to the stability of DC reference.A good performance of AC constant current source can be got by adding a voltage-current conversion circuit.The result shows that the stability of AC output current is up to 5×10^-5 at 5A.
出处
《纺织高校基础科学学报》
CAS
2014年第2期267-270,共4页
Basic Sciences Journal of Textile Universities
