小型绝对式光电轴角编码器电路优化设计  

Optimal circuit design for miniature absolute photoelectric encoder

作　　者：刘泉[1] 杜颖财[1,2] 

机构地区：[1]长春理工大学光电工程学院,吉林长春130022 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《重庆邮电大学学报（自然科学版）》2013年第6期768-772,812,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：中国科学院知识创新工程领域前沿项目~~

摘　　要：为实现绝对式光电轴角编码器的小型化和智能化,设计了一种基于DSP2812和数字电位计的小型绝对式光电编码器处理电路。提出采用全数字化处理的方法实现粗、精码信号的处理;利用DSP内部A/D转换器实现粗码信号的放大、整形等功能,取消人工调试机械电位器及放大器、比较器等硬件;同时,将编码器精码信号幅值偏差、稳定性偏差的实时补偿算法嵌入到处理电路中。以16位编码器为实验对象,测试电路性能。实验表明,新设计的处理电路的直径仅为36 mm,且光电信号幅值变化率≤2%,直流漂移量≤2%,实时补偿时间约为2 s。其性能可靠,实现编码器机电一体式,缩小了航天设备的体积,且有效提高了编码器的环境适应性和测角可靠性。In order to realize the miniaturization and intelligence of absolute photoelectric encoder, a processing circuit based on DSP2812 and digital potentiometer was designed. To automatically adjust the amplitude of precise and coarse sig- nal, a fully digital processing method was proposed. The DSP with A/D was used to achieve amplification and shaping of coarse code signal. And several hardware such as debugging mechanical potentiometer, amplifier and comparator were can- celled. Meanwhile, real-time compensation algorithm for amplitude deviation and stability deviation of precise code signal was embedded into the processing circuit. To test the capability of the processing circuit, a 16-bit eneoder was selected as the experimental object. The experimental results showed that the diameter of the newly designed processing circuit was merely 36 ram. The amplitude variation rate of photoelectric signal was less than 2%. The DC drift value was less than 2%. Real-time compensation time was about 2 s. The new processing circuit with electromechanieal integration was relia- ble, which can minimize the size of aerospace equipments, and improve the environmental adaptability and angle measure- ment reliability of the encoder.

关 键 词：光电编码器 电路设计 全数字化 小型 智能 

分 类 号：TN29[电子电信—物理电子学]