Design of Interface Circuit of CPLD-Based Photoelectric Encoder

Abstract

A CPLD-based Photoelectric encoder that measures angle and angular velocity was designed aiming at precise requirements on angle and angular velocity measures in photo-electric servo system. Based on the work principle of photoelectric encoder, a segmented velocity-measure algorithm based on different measure time intervals was presented, and the concrete process in the environment of Isplever Project Navigator was detailed described. Finally, DSP processor TMS320F2812 and CPLD chip LC4512V-75T176 were used for verification. The result showed that this circuit has the features of realization-simple, high measure precision and reliability as well as good commonality. It will lay a solid foundation for the realization of photoelectric servo system’s digital control.

Software Design of Quartz Crystal Test and Sort System

“…Peripheral actuators include vibration plate, solenoid valve, stepper motor, etc. CPLD (Complex Programmable Logic Device) can not only provide with complex logic control, but also facilitate the expansion of the system [4,5] . The system controls vibration plate to do intermittently vibrate to feed for the sorting equipment.…”

Design of Gate Opening Apparatus Based on the Absolute Value Photoelectric Encoder of AVM58 Type

“…The incremental photoelectric encoder is generally made up of glass encoder and photoelectric component, so its precision and resolution are relatively high and its service life is relatively long. But because its output is pulse signal, there is zero error and power-down memory problem in its actual uses [2,3]. Especially when the system is powered down, and the gate has slide or other location changes, which can not be detected with the incremental photoelectric encoder, the hidden security danger will exist certainly.…”