CAJ | 학술논문

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.
설계료일충빈솔급폭도가수공적교류항류원.이단편궤위공제핵심,용고정도D/A실현수자공제,항류원유대공솔운방전로산생,가제공교류유효치10mA~1A수출적항류,병용고정도채양전로채집수출전류반궤연건동태조정,제고료항류수출적은정성화정도.경측시,해설계방안유교호적항류수출은정도,수자조정공능가고.
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.