一种高稳定数控交流恒流源的设计  

The Design of a High Stable and Digitally Controlled Alternating ConstantCurrent Source

作　　者：谢志远[1] 贡振岗[1] 杨星[1] 吴晓燕[1] 

机构地区：[1]华北电力大学,河北保定071000

出　　处：《电测与仪表》2013年第3期102-106,共5页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(61172075)

摘　　要：设计了一种频率及幅度可数控的交流恒流源。以单片机为控制核心,用高精度D/A实现数字控制,恒流源由大功率运放电路产生,可提供交流有效值10mA-1A输出的恒流,并用高精度采样电路采集输出电流反馈软件动态调整,提高了恒流输出的稳定性和精度。经测试,该设计方案有较好的恒流输出稳定度,数字调整功能可靠。This paper devises a alternating constant-current source of digitally adjustable frequency. With Single- chip Microcomputer as the control core to realize digital control with high precision D/A, constant-current can be generated by high power operational amplifier circuit. It can provide AC RMS 10mA-1A output current and realize dynamically software adjustment using high precision sampling circuit to collect output current and feedback. The stability and accuracy are improved. The test results show that the output of the constant- current source is stable when digital setup changes.

关 键 词：ARM 恒流源 数控增益 电流采样 

分 类 号：TM932[电气工程—电力电子与电力传动]