高精度数控恒流源的设计与实现  

Design and implementation of high precision numerical control constant current source

作　　者：宋林桂 

机构地区：[1]苏州健雄职业技术学院电气工程学院,江苏太仓215411

出　　处：《无线互联科技》2016年第18期59-60,76,共3页Wireless Internet Technology

摘　　要：为了满足可调温无纺布热切割机对恒流源的需求,文章阐述了一种基于单片机的高精度数控恒流源的设计和实现方法。该电源以电流串联负反馈式压控恒流源电路为基础,以AT89S52单片机为控制核实现数字化控制。为实现高精度要求,在数控部分中,要采用12位高精度数字模拟转换器（Digital Analog Converter,DAC）芯片TLV5616控制压控恒流源的输出电流,并利用16位高精度模数转换器（Analog to Digital Converter,ADC）芯片ADS1115测量输出电流。文章采用矩阵键盘设定电流输出值,采用LCD12864液晶屏显示设定的电流和负载两端电压值。测试结果表明,本恒流源在20~2000m A输出电流时,输出电流与给定值误差小于5m A。In order to meet the demand of temperature adjustable non-woven hot cutting machine for the constant current source, the paper introduced a design and implementation method of high precision CNC based on constant current source. The power supply is based on the current series negative feedback voltage controlled constant current source circuit, taking AT89S52 microcontroller as the control core to realize digital control. To achieve the requirements of high precision, in the numerical control part, a 12 bit high precision DAC （Digital Analog Converter） control chip TLV5616 voltage is used to control the output current of constant current source controlled by voltage, and the 16 bit high precision ADC （Analog to Digital Converter） measurement chip ADS11l5 is used to measure output current. The article uses the matrix keyboard to set the current output value, with LCD12864 liquid screen showing voltage value of both current and the load end. The results showed that the error between output current and the given value is less than 5mA when the constant current source is outputing current in the range of 20-2000mA.

关 键 词：AT89S52 恒流源 ADS1115 TLV5616 

分 类 号：TM46[电气工程—电器]